Class: Mongoid::Contextual::Memory

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain: self, `::Mongoid::Positional`, `Queryable`, `::Mongoid::Association::EagerLoadable`, `Aggregable::Memory`, Enumerable
Inherits:	Object
Defined in:	lib/mongoid/contextual/memory.rb

Overview

Context object used for performing bulk query and persistence operations on documents which have been loaded into application memory. The method interface of this class is consistent with Mongoid::Contextual::Mongo.

Class Method Summary

.new(criteria) ⇒ Memory constructor

Create the new in memory context.

Instance Attribute Summary

#documents readonly
#matching The in memory documents that match the selector.(The in memory documents that match the selector.) readonly
#path readonly
#path The atomic path.(The atomic path.) readonly
#root readonly
#root The root document.(The root document.) readonly
#selector readonly
#selector The root document selector.(The root document selector.) readonly
#limiting ⇒ Integer rw private Internal use only Internal use only

Get the limiting value.
#limiting=(value) ⇒ Integer rw private Internal use only Internal use only

::Set the limiting value.
#skipping ⇒ Integer rw private Internal use only Internal use only

Get the skipping value.
#skipping=(value) ⇒ Integer rw private Internal use only Internal use only

::Set the skipping value.

`Queryable` - Included

#blank?	Is the enumerable of matching documents empty?
#collection, #collection The collection to query against., #criteria, #criteria The criteria for the context.,
#empty?	Alias for Queryable#blank?.
#klass, #klass The klass for the criteria.

`::Mongoid::Association::EagerLoadable` - Included

#eager_loadable?

Indicates whether the criteria has association inclusions which should be eager loaded.

Instance Method Summary

#==(other) ⇒ true | false

Check if the context is equal to the other object.
#delete ⇒ nil (also: #delete_all)

Delete all documents in the database that match the selector.
#delete_all

Alias for #delete.
#destroy ⇒ nil (also: #destroy_all)

Destroy all documents in the database that match the selector.
#destroy_all

Alias for #destroy.
#distinct(field) ⇒ Array<Object>

Get the distinct values in the db for the provided field.
#each ⇒ Enumerator

Iterate over the context.
#exists?(id_or_conditions = :none) ⇒ true | false

Do any documents exist for the context.
#fifth ⇒ Document

Get the fifth document in the database for the criteria’s selector.
#fifth! ⇒ Document

Get the fifth document in the database for the criteria’s selector or raise an error if none is found.
#find_first(limit = nil)

Alias for #first.
#first(limit = nil) ⇒ Document (also: #one, #find_first)

Get the first document in the database for the criteria’s selector.
#first! ⇒ Document

Get the first document in the database for the criteria’s selector or raise an error if none is found.
#fourth ⇒ Document

Get the fourth document in the database for the criteria’s selector.
#fourth! ⇒ Document

Get the fourth document in the database for the criteria’s selector or raise an error if none is found.
#inc(incs) ⇒ Enumerator

Increment a value on all documents.
#last(limit = nil) ⇒ Document

Get the last document in the database for the criteria’s selector.
#last! ⇒ Document

Get the last document in the database for the criteria’s selector or raise an error if none is found.
#length ⇒ Integer (also: #size)

Get the length of matching documents in the context.
#limit(value) ⇒ Memory

Limits the number of documents that are returned.
#one(limit = nil)

Alias for #first.
#pick(*fields) ⇒ Object | Array<Object>

Pick the field values in memory.
#pluck(*fields) ⇒ Array<Object> | Array<Array<Object>>

Pluck the field values in memory.
#second ⇒ Document

Get the second document in the database for the criteria’s selector.
#second! ⇒ Document

Get the second document in the database for the criteria’s selector or raise an error if none is found.
#second_to_last ⇒ Document

Get the second to last document in the database for the criteria’s selector.
#second_to_last! ⇒ Document

Get the second to last document in the database for the criteria’s selector or raise an error if none is found.
#size

Alias for #length.
#skip(value) ⇒ Memory

Skips the provided number of documents.
#sort(values) ⇒ Memory

Sorts the documents by the provided spec.
#take(limit = nil) ⇒ Document

Take the given number of documents from the database.
#take! ⇒ Document

Take the given number of documents from the database or raise an error if none are found.
#tally(field) ⇒ Hash

Tally the field values in memory.
#third ⇒ Document

Get the third document in the database for the criteria’s selector.
#third! ⇒ Document

Get the third document in the database for the criteria’s selector or raise an error if none is found.
#third_to_last ⇒ Document

Get the third to last document in the database for the criteria’s selector.
#third_to_last! ⇒ Document

Get the third to last document in the database for the criteria’s selector or raise an error if none is found.
#update(attributes = nil) ⇒ nil | false

Update the first matching document atomically.
#update_all(attributes = nil) ⇒ nil | false

Update all the matching documents atomically.
#_session private
#apply_options ⇒ Memory private Internal use only Internal use only

Apply criteria options.
#apply_sorting private

Map the sort symbols to the correct MongoDB values.
#compare(a, b) ⇒ Integer private Internal use only Internal use only

Compare two values, handling the cases when either value is nil.
#compare_operand(value) ⇒ Integer | Object private

Get the operand value to be used in comparison.
#documents_for_iteration ⇒ Array<Document> private Internal use only Internal use only

Get the documents the context should iterate.
#in_place_sort(values) private

Sort the documents in place.
#pluck_from_doc(doc, *fields) ⇒ Object | Array<Object> private

Pluck the field values from the given document.
#prepare_remove(doc) private Internal use only Internal use only

Prepare the document for batch removal.
#raise_document_not_found_error private
#retrieve_value_at_path(document, field_path) ⇒ Object | nil private

Retrieve the value for the current document at the given field path.
#update_documents(attributes, docs) private Internal use only Internal use only

Update the provided documents with the attributes.

`::Mongoid::Positional` - Included

#positionally	Takes the provided selector and atomic operations and replaces the indexes of the embedded documents with the positional operator when needed.
#process_operations, #process_updates, #replace_index

`::Mongoid::Association::EagerLoadable` - Included

#eager_load	Load the associations for the given documents.
#preload	Load the associations for the given documents.

`Aggregable::Memory` - Included

#aggregates	Get all the aggregate values for the provided field.
#avg	Get the average value of the provided field.
#max	Get the max value of the provided field.
#min	Get the min value of the provided field.
#sum	Get the sum value of the provided field.
#aggregate_by	Aggregate by the provided field and method.

Constructor Details

.new(criteria) ⇒ `Memory`

Create the new in memory context.

Examples:

Create the new context.

Memory.new(criteria)

Parameters:

criteria (Criteria) —

The criteria.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 173


def initialize(criteria)
  @criteria, @klass = criteria, criteria.klass
  @documents = criteria.documents.select do |doc|
    @root ||= doc._root
    @collection ||= root.collection
    doc._matches?(criteria.selector)
  end
  apply_sorting
  apply_options
end

Instance Attribute Details

#documents (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#limiting ⇒ Integer (rw, private)

This method is for internal use only.

Get the limiting value.

Examples:

Get the limiting value.

Returns:

(Integer) —

The limit.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 566


def limiting
  defined?(@limiting) ? @limiting : nil
end

#limiting=(value) ⇒ Integer (rw, private)

This method is for internal use only.

::Set the limiting value.

Examples:

::Set the limiting value.

Parameters:

value (Integer) —

The limit.

Returns:

(Integer) —

The limit.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 579


def limiting=(value)
  @limiting = value
end

#matching The in memory documents that match the selector.(The in memory documents that match the selector.) (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#path (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#path The atomic path.(The atomic path.) (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#root (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#root The root document.(The root document.) (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#selector (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#selector The root document selector.(The root document selector.) (readonly)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 25


attr_reader :documents, :path, :root, :selector

#skipping ⇒ Integer (rw, private)

This method is for internal use only.

Get the skipping value.

Examples:

Get the skipping value.

Returns:

(Integer) —

The skip.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 590


def skipping
  defined?(@skipping) ? @skipping : nil
end

#skipping=(value) ⇒ Integer (rw, private)

This method is for internal use only.

::Set the skipping value.

Examples:

::Set the skipping value.

Parameters:

value (Integer) —

The skip.

Returns:

(Integer) —

The skip.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 603


def skipping=(value)
  @skipping = value
end

Instance Method Details

#==(other) ⇒ `true` | `false`

Check if the context is equal to the other object.

Examples:

Check equality.

context == []

Parameters:

other (Array) —

The other array.

Returns:

(true | false) —

If the objects are equal.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 35


def ==(other)
  return false unless other.respond_to?(:entries)
  entries == other.entries
end

#_session (private)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 682


def _session
  @criteria.send(:_session)
end

#apply_options ⇒ `Memory` (private)

This method is for internal use only.

Apply criteria options.

Examples:

Apply criteria options.

context.apply_options

Returns:

(Memory) —

self.

Raises:

(Errors::InMemoryCollationNotSupported)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 615


def apply_options
  raise Errors::InMemoryCollationNotSupported.new if criteria.options[:collation]
  skip(criteria.options[:skip]).limit(criteria.options[:limit])
end

#apply_sorting (private)

Map the sort symbols to the correct MongoDB values.

Examples:

Apply the sorting params.

context.apply_sorting

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 624


def apply_sorting
  if spec = criteria.options[:sort]
    in_place_sort(spec)
  end
end

#compare(a, b) ⇒ Integer (private)

This method is for internal use only.

Compare two values, handling the cases when either value is nil.

Examples:

Compare the two objects.

context.compare(a, b)

Parameters:

a (Object) —

The first object.
b (Object) —

The second object.

Returns:

(Integer) —

The comparison value.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 642


def compare(a, b)
  return 0 if a.nil? && b.nil?
  return 1 if a.nil?
  return -1 if b.nil?

  compare_operand(a) <=> compare_operand(b)
end

#compare_operand(value) ⇒ Integer | `Object` (private)

Get the operand value to be used in comparison. Adds capability to sort boolean values.

Examples:

Get the comparison operand.

compare_operand(true) #=> 1

Parameters:

value (Object) —

The value to be used in comparison.

Returns:

(Integer | Object) —

The comparison operand.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 695


def compare_operand(value)
  case value
  when TrueClass then 1
  when FalseClass then 0
  else value
  end
end

#delete ⇒ `nil` Also known as: #delete_all

Delete all documents in the database that match the selector.

Examples:

Delete all the documents.

context.delete

Returns:

(nil) —

Nil.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 46


def delete
  deleted = count
  removed = map do |doc|
    prepare_remove(doc)
    doc.send(:as_attributes)
  end
  unless removed.empty?
    collection.find(selector).update_one(
      positionally(selector, "$pullAll" => { path => removed }),
      session: _session
    )
  end
  deleted
end

#delete_all

Alias for #delete.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 60


alias :delete_all :delete

#destroy ⇒ `nil` Also known as: #destroy_all

Destroy all documents in the database that match the selector.

Examples:

Destroy all the documents.

context.destroy

Returns:

(nil) —

Nil.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 68


def destroy
  deleted = count
  each do |doc|
    documents.delete_one(doc)
    doc.destroy
  end
  deleted
end

#destroy_all

Alias for #destroy.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 76


alias :destroy_all :destroy

#distinct(field) ⇒ Array<`Object`>

Get the distinct values in the db for the provided field.

Examples:

Get the distinct values.

context.distinct(:name)

Parameters:

field (String | Symbol) —

The name of the field.

Returns:

(Array<Object>) —

The distinct values for the field.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 86


def distinct(field)
  pluck(field).uniq
end

#documents_for_iteration ⇒ Array<Document> (private)

This method is for internal use only.

Get the documents the context should iterate. This follows 3 rules:

Examples:

Get the documents for iteration.

context.documents_for_iteration

Returns:

(Array<Document>) —

The docs to iterate.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 530


def documents_for_iteration
  docs = documents[skipping || 0, limiting || documents.length] || []
  if eager_loadable?
    eager_load(docs)
  end
  docs
end

#each ⇒ `Enumerator`

Iterate over the context. If provided a block, yield to a ::Mongoid document for each, otherwise return an enum.

Examples:

Iterate over the context.

context.each do |doc|
  puts doc.name
end

Returns:

(Enumerator) —

The enumerator.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 99


def each
  if block_given?
    documents_for_iteration.each do |doc|
      yield(doc)
    end
    self
  else
    to_enum
  end
end

#exists?(id_or_conditions = :none) ⇒ `true` | `false`

Do any documents exist for the context.

Examples:

Do any documents exist for the context.

context.exists?

Do any documents exist for given _id.

context.exists?(BSON::ObjectId(...))

Do any documents exist for given conditions.

context.exists?(name: "...")

Parameters:

id_or_conditions (Hash | Object | false) (defaults to: :none) —

an _id to search for, a hash of conditions, nil or false.

Returns:

(true | false) —

If the count is more than zero. Always false if passed nil or false.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 126


def exists?(id_or_conditions = :none)
  case id_or_conditions
  when :none then any?
  when nil, false then false
  when Hash then Memory.new(criteria.where(id_or_conditions)).exists?
  else Memory.new(criteria.where(_id: id_or_conditions)).exists?
  end
end

#fifth ⇒ Document

Get the fifth document in the database for the criteria’s selector.

Examples:

Get the fifth document.

context.fifth

Returns:

(Document) —

The fifth document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 454


def fifth
  eager_load([documents.fifth]).first
end

#fifth! ⇒ Document

Get the fifth document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the fifth document.

context.fifth!

Returns:

(Document) —

The fifth document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 468


def fifth!
  fifth || raise_document_not_found_error
end

#find_first(limit = nil)

Alias for #first.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 151


alias :find_first :first

#first(limit = nil) ⇒ Document Also known as: #one, #find_first

Get the first document in the database for the criteria’s selector.

Examples:

Get the first document.

context.first

Parameters:

limit (Integer) (defaults to: nil) —

The number of documents to return.

Returns:

(Document) —

The first document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 143


def first(limit = nil)
  if limit
    eager_load(documents.first(limit))
  else
    eager_load([documents.first]).first
  end
end

#first! ⇒ Document

Get the first document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the first document.

context.first!

Returns:

(Document) —

The first document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 163


def first!
  first || raise_document_not_found_error
end

#fourth ⇒ Document

Get the fourth document in the database for the criteria’s selector.

Examples:

Get the fourth document.

context.fourth

Returns:

(Document) —

The fourth document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 430


def fourth
  eager_load([documents.fourth]).first
end

#fourth! ⇒ Document

Get the fourth document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the fourth document.

context.fourth!

Returns:

(Document) —

The fourth document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 444


def fourth!
  fourth || raise_document_not_found_error
end

#in_place_sort(values) (private)

Sort the documents in place.

Examples:

Sort the documents.

context.in_place_sort(name: 1)

Parameters:

values (Hash) —

The field/direction sorting pairs.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 656


def in_place_sort(values)
  documents.sort! do |a, b|
    values.map do |field, direction|
      direction * compare(a[field], b[field])
    end.detect { |value| !value.zero? } || 0
  end
end

#inc(incs) ⇒ `Enumerator`

Increment a value on all documents.

Examples:

Perform the increment.

context.inc(likes: 10)

Parameters:

incs (Hash) —

The operations.

Returns:

(Enumerator) —

The enumerator.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 192


def inc(incs)
  each do |document|
    document.inc(incs)
  end
end

#last(limit = nil) ⇒ Document

Get the last document in the database for the criteria’s selector.

Examples:

Get the last document.

context.last

Parameters:

limit (Integer) (defaults to: nil) —

The number of documents to return.

Returns:

(Document) —

The last document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 206


def last(limit = nil)
  if limit
    eager_load(documents.last(limit))
  else
    eager_load([documents.last]).first
  end
end

#last! ⇒ Document

Get the last document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the last document.

context.last!

Returns:

(Document) —

The last document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 224


def last!
  last || raise_document_not_found_error
end

#length ⇒ Integer Also known as: #size

Get the length of matching documents in the context.

Examples:

Get the length of matching documents.

context.length

Returns:

(Integer) —

The matching length.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 234


def length
  documents.length
end

#limit(value) ⇒ `Memory`

Limits the number of documents that are returned.

Examples:

Limit the documents.

context.limit(20)

Parameters:

value (Integer) —

The number of documents to return.

Returns:

(Memory) —

The context.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 247


def limit(value)
  self.limiting = value
  self
end

#one(limit = nil)

Alias for #first.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 150


alias :one :first

#pick(*fields) ⇒ `Object` | Array<`Object`>

Pick the field values in memory.

Examples:

Get the values in memory.

context.pick(:name)

Parameters:

*fields ([ String | Symbol ]...) —

Field(s) to pick.

Returns:

(Object | Array<Object>) —

The picked values.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 274


def pick(*fields)
  if doc = documents.first
    pluck_from_doc(doc, *fields)
  end
end

#pluck(*fields) ⇒ Array<`Object`> | Array<Array<`Object`>>

Pluck the field values in memory.

Examples:

Get the values in memory.

context.pluck(:name)

Parameters:

*fields ([ String | Symbol ]...) —

Field(s) to pluck.

Returns:

(Array<Object> | Array<Array<Object>>) —

The plucked values.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 260


def pluck(*fields)
  documents.map do |doc|
    pluck_from_doc(doc, *fields)
  end
end

#pluck_from_doc(doc, *fields) ⇒ `Object` | Array<`Object`> (private)

Pluck the field values from the given document.

Parameters:

doc (Document) —

The document to pluck from.
*fields ([ String | Symbol ]...) —

Field(s) to pluck.

Returns:

(Object | Array<Object>) —

The plucked values.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 766


def pluck_from_doc(doc, *fields)
  if fields.length == 1
    retrieve_value_at_path(doc, fields.first)
  else
    fields.map do |field|
      retrieve_value_at_path(doc, field)
    end
  end
end

#prepare_remove(doc) (private)

This method is for internal use only.

Prepare the document for batch removal.

Examples:

Prepare for removal.

context.prepare_remove(doc)

Parameters:

doc (Document) —

The document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 672


def prepare_remove(doc)
  @selector ||= root.atomic_selector
  @path ||= doc.atomic_path
  documents.delete_one(doc)
  doc._parent.remove_child(doc)
  doc.destroyed = true
end

#raise_document_not_found_error (private)

Raises:

(Errors::DocumentNotFound)

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 776


def raise_document_not_found_error
  raise Errors::DocumentNotFound.new(klass, nil, nil)
end

#retrieve_value_at_path(document, field_path) ⇒ `Object` | `nil` (private)

Retrieve the value for the current document at the given field path.

For example, if I have the following models:

User has_many Accounts
address is a hash on Account

u = User.new(accounts: [ Account.new(address: { street: "W 50th" }) ])
retrieve_value_at_path(u, "user.accounts.address.street")
# => [ "W 50th" ]

Note that the result is in an array since accounts is an array. If it was nested in two arrays the result would be in a 2D array.

Parameters:

document (Object) —

The object to traverse the field path.
field_path (String) —

The dotted string that represents the path to the value.

Returns:

(Object | nil) —

The value at the given field path or nil if it doesn’t exist.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 723


def retrieve_value_at_path(document, field_path)
  return if field_path.blank? || !document
  segment, remaining = field_path.to_s.split('.', 2)

  curr = if document.is_a?(Document)
    # Retrieves field for segment to check localization. Only does one
    # iteration since there's no dots
    res = if remaining
      field = document.class.traverse_association_tree(segment)
      # If this is a localized field, and there are remaining, get the
      # _translations hash so that we can get the specified translation in
      # the remaining
      if field&.localized?
        document.send("#{segment}_translations")
      end
    end
    meth = klass.aliased_associations[segment] || segment
    res.nil? ? document.try(meth) : res
  elsif document.is_a?(Hash)
    # TODO: Remove the indifferent access when implementing MONGOID-5410.
    document.key?(segment.to_s) ?
      document[segment.to_s] :
      document[segment.to_sym]
  else
    nil
  end

  return curr unless remaining

  if curr.is_a?(Array)
    # compact is used for consistency with server behavior.
    curr.map { |d| retrieve_value_at_path(d, remaining) }.compact
  else
    retrieve_value_at_path(curr, remaining)
  end
end

#second ⇒ Document

Get the second document in the database for the criteria’s selector.

Examples:

Get the second document.

context.second

Returns:

(Document) —

The second document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 382


def second
  eager_load([documents.second]).first
end

#second! ⇒ Document

Get the second document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the second document.

context.second!

Returns:

(Document) —

The second document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 396


def second!
  second || raise_document_not_found_error
end

#second_to_last ⇒ Document

Get the second to last document in the database for the criteria’s selector.

Examples:

Get the second to last document.

context.second_to_last

Returns:

(Document) —

The second to last document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 478


def second_to_last
  eager_load([documents.second_to_last]).first
end

#second_to_last! ⇒ Document

Get the second to last document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the second to last document.

context.second_to_last!

Returns:

(Document) —

The second to last document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 492


def second_to_last!
  second_to_last || raise_document_not_found_error
end

#size

Alias for #length.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 237


alias :size :length

#skip(value) ⇒ `Memory`

Skips the provided number of documents.

Examples:

Skip the documents.

context.skip(20)

Parameters:

value (Integer) —

The number of documents to skip.

Returns:

(Memory) —

The context.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 334


def skip(value)
  self.skipping = value
  self
end

#sort(values) ⇒ `Memory`

Sorts the documents by the provided spec.

Examples:

Sort the documents.

context.sort(name: -1, title: 1)

Parameters:

values (Hash) —

The sorting values as field/direction(1/-1) pairs.

Returns:

(Memory) —

The context.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 348


def sort(values)
  in_place_sort(values) and self
end

#take(limit = nil) ⇒ Document

Take the given number of documents from the database.

Examples:

Take a document.

context.take

Parameters:

limit (Integer | nil) (defaults to: nil) —

The number of documents to take or nil.

Returns:

(Document) —

The document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 304


def take(limit = nil)
  if limit
    eager_load(documents.take(limit))
  else
    eager_load([documents.first]).first
  end
end

#take! ⇒ Document

Take the given number of documents from the database or raise an error if none are found.

Examples:

Take a document.

context.take

Returns:

(Document) —

The document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 322


def take!
  take || raise_document_not_found_error
end

#tally(field) ⇒ Hash

Tally the field values in memory.

Examples:

Get the counts of values in memory.

context.tally(:name)

Parameters:

field (String | Symbol) —

Field to tally.

Returns:

(Hash) —

The hash of counts.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 288


def tally(field)
  return documents.each_with_object({}) do |d, acc|
    v = retrieve_value_at_path(d, field)
    acc[v] ||= 0
    acc[v] += 1
  end
end

#third ⇒ Document

Get the third document in the database for the criteria’s selector.

Examples:

Get the third document.

context.third

Returns:

(Document) —

The third document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 406


def third
  eager_load([documents.third]).first
end

#third! ⇒ Document

Get the third document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the third document.

context.third!

Returns:

(Document) —

The third document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 420


def third!
  third || raise_document_not_found_error
end

#third_to_last ⇒ Document

Get the third to last document in the database for the criteria’s selector.

Examples:

Get the third to last document.

context.third_to_last

Returns:

(Document) —

The third to last document.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 502


def third_to_last
  eager_load([documents.third_to_last]).first
end

#third_to_last! ⇒ Document

Get the third to last document in the database for the criteria’s selector or raise an error if none is found.

Examples:

Get the third to last document.

context.third_to_last!

Returns:

(Document) —

The third to last document.

Raises:

(Mongoid::Errors::DocumentNotFound) —

raises when there are no documents to take.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 516


def third_to_last!
  third_to_last || raise_document_not_found_error
end

#update(attributes = nil) ⇒ `nil` | `false`

Update the first matching document atomically.

Examples:

Update the matching document.

context.update(name: "Smiths")

Parameters:

attributes (Hash) (defaults to: nil) —

The new attributes for the document.

Returns:

(nil | false) —

False if no attributes were provided.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 360


def update(attributes = nil)
  update_documents(attributes, [ first ])
end

#update_all(attributes = nil) ⇒ `nil` | `false`

Update all the matching documents atomically.

Examples:

Update all the matching documents.

context.update_all(name: "Smiths")

Parameters:

attributes (Hash) (defaults to: nil) —

The new attributes for each document.

Returns:

(nil | false) —

False if no attributes were provided.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 372


def update_all(attributes = nil)
  update_documents(attributes, entries)
end

#update_documents(attributes, docs) (private)

This method is for internal use only.

Update the provided documents with the attributes.

Examples:

Update the documents.

context.update_documents({}, doc)

Parameters:

attributes (Hash) —

The attributes.
docs (Array<Document>) —

The docs to update.

[ GitHub ]

# File 'lib/mongoid/contextual/memory.rb', line 547


def update_documents(attributes, docs)
  return false if !attributes || docs.empty?
  updates = { "$set" => {}}
  docs.each do |doc|
    @selector ||= root.atomic_selector
    doc.write_attributes(attributes)
    updates["$set"].merge!(doc.atomic_updates["$set"] || {})
    doc.move_changes
  end
  collection.find(selector).update_one(updates, session: _session) unless updates["$set"].empty?
end

Class: Mongoid::Contextual::Memory

Overview

Class Method Summary

Instance Attribute Summary

Queryable - Included

::Mongoid::Association::EagerLoadable - Included

Instance Method Summary

::Mongoid::Positional - Included

::Mongoid::Association::EagerLoadable - Included

Aggregable::Memory - Included

Constructor Details

.new(criteria) ⇒ Memory

Instance Attribute Details

#documents (readonly)

#limiting ⇒ Integer (rw, private)

#limiting=(value) ⇒ Integer (rw, private)

#matching The in memory documents that match the selector.(The in memory documents that match the selector.) (readonly)

#path (readonly)

#path The atomic path.(The atomic path.) (readonly)

#root (readonly)

#root The root document.(The root document.) (readonly)

#selector (readonly)

#selector The root document selector.(The root document selector.) (readonly)

#skipping ⇒ Integer (rw, private)

#skipping=(value) ⇒ Integer (rw, private)

Instance Method Details

#==(other) ⇒ true | false

#_session (private)

#apply_options ⇒ Memory (private)

#apply_sorting (private)

#compare(a, b) ⇒ Integer (private)

#compare_operand(value) ⇒ Integer | Object (private)

#delete ⇒ nil Also known as: #delete_all

#delete_all

#destroy ⇒ nil Also known as: #destroy_all

#destroy_all

#distinct(field) ⇒ Array<Object>

#documents_for_iteration ⇒ Array<Document> (private)

#each ⇒ Enumerator

#exists?(id_or_conditions = :none) ⇒ true | false

#fifth ⇒ Document

#fifth! ⇒ Document

#find_first(limit = nil)

#first(limit = nil) ⇒ Document Also known as: #one, #find_first

#first! ⇒ Document

#fourth ⇒ Document

#fourth! ⇒ Document

#in_place_sort(values) (private)

#inc(incs) ⇒ Enumerator

#last(limit = nil) ⇒ Document

#last! ⇒ Document

#length ⇒ Integer Also known as: #size

#limit(value) ⇒ Memory

#one(limit = nil)

#pick(*fields) ⇒ Object | Array<Object>

#pluck(*fields) ⇒ Array<Object> | Array<Array<Object>>

#pluck_from_doc(doc, *fields) ⇒ Object | Array<Object> (private)

#prepare_remove(doc) (private)

#raise_document_not_found_error (private)

#retrieve_value_at_path(document, field_path) ⇒ Object | nil (private)

#second ⇒ Document

#second! ⇒ Document

#second_to_last ⇒ Document

#second_to_last! ⇒ Document

#size

#skip(value) ⇒ Memory

#sort(values) ⇒ Memory

#take(limit = nil) ⇒ Document

#take! ⇒ Document

#tally(field) ⇒ Hash

#third ⇒ Document

#third! ⇒ Document

#third_to_last ⇒ Document

#third_to_last! ⇒ Document

#update(attributes = nil) ⇒ nil | false

#update_all(attributes = nil) ⇒ nil | false

#update_documents(attributes, docs) (private)

`Queryable` - Included

`::Mongoid::Association::EagerLoadable` - Included

`::Mongoid::Positional` - Included

`::Mongoid::Association::EagerLoadable` - Included

`Aggregable::Memory` - Included

.new(criteria) ⇒ `Memory`

#==(other) ⇒ `true` | `false`

#apply_options ⇒ `Memory` (private)

#compare_operand(value) ⇒ Integer | `Object` (private)

#delete ⇒ `nil` Also known as: #delete_all

#destroy ⇒ `nil` Also known as: #destroy_all

#distinct(field) ⇒ Array<`Object`>

#each ⇒ `Enumerator`

#exists?(id_or_conditions = :none) ⇒ `true` | `false`

#inc(incs) ⇒ `Enumerator`

#limit(value) ⇒ `Memory`

#pick(*fields) ⇒ `Object` | Array<`Object`>

#pluck(*fields) ⇒ Array<`Object`> | Array<Array<`Object`>>

#pluck_from_doc(doc, *fields) ⇒ `Object` | Array<`Object`> (private)

#retrieve_value_at_path(document, field_path) ⇒ `Object` | `nil` (private)

#skip(value) ⇒ `Memory`

#sort(values) ⇒ `Memory`

#update(attributes = nil) ⇒ `nil` | `false`

#update_all(attributes = nil) ⇒ `nil` | `false`