Module: Mongoid::Fields

Relationships & Source Files
Namespace Children
Modules: `ClassMethods`, `Validators`
Classes: `Encrypted`, `ForeignKey`, `Localized`, `Standard`
Extension / Inclusion / Inheritance Descendants
Included In: `Composable`, `Document`, `GlobalDiscriminatorKeyAssignment::InvalidFieldHost`
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, ActiveSupport::Concern
Defined in:	lib/mongoid/fields.rb, lib/mongoid/fields/encrypted.rb, lib/mongoid/fields/foreign_key.rb, lib/mongoid/fields/localized.rb, lib/mongoid/fields/standard.rb, lib/mongoid/fields/validators/macro.rb

Overview

This module defines behavior for fields.

Constant Summary

Boolean =
# File 'lib/mongoid/fields.rb', line 17
```
Mongoid::Boolean
```
IDS = Internal use only

Constant for all names of the _id field in a document.

This does not include aliases of _id field.

# File 'lib/mongoid/fields.rb', line 45
```
[ :_id, '_id', ].freeze
```
INVALID_BSON_CLASSES = Internal use only

::BSON classes that are not supported as field types

# File 'lib/mongoid/fields.rb', line 50
```
[ BSON::Decimal128, BSON::Int32, BSON::Int64 ].freeze
```
StringifiedSymbol =
# File 'lib/mongoid/fields.rb', line 16
```
Mongoid::StringifiedSymbol
```

TYPE_MAPPINGS =

For fields defined with symbols use the correct class.

# File 'lib/mongoid/fields.rb', line 20

{
  array: Array,
  big_decimal: BigDecimal,
  binary: BSON::Binary,
  boolean: Mongoid::Boolean,
  date: Date,
  date_time: DateTime,
  float: Float,
  hash: Hash,
  integer: Integer,
  object_id: BSON::ObjectId,
  range: Range,
  regexp: Regexp,
  set: Set,
  string: String,
  stringified_symbol: StringifiedSymbol,
  symbol: Symbol,
  time: Time
}.with_indifferent_access

Class Method Summary

.database_field_name(name, relations, aliased_fields, aliased_associations) ⇒ String Internal use only Internal use only

Get the name of the provided field as it is stored in the database.
.option(option_name, &block)

Stores the provided block to be run when the option name specified is defined on a field.
.options ⇒ Hash

Return a map of custom option names to their handlers.
.traverse_association_tree(key, fields, associations, aliased_associations) {|The, The, Whether| ... } ⇒ Field Internal use only Internal use only

Traverse down the association tree and search for the field for the given key.

Instance Attribute Summary

#using_object_ids? ⇒ true | false readonly

Is the document using object ids?

Instance Method Summary

#apply_default(name)

Applies a single default value for the given name.
#apply_defaults

Apply all the defaults at once.
#apply_post_processed_defaults ⇒ Array<String>

Apply all default values to the document which are procs.
#apply_pre_processed_defaults ⇒ Array<String>

Apply all default values to the document which are not procs.
#attribute_names ⇒ Array<String>

Returns an array of names for the attributes available on this object.
#database_field_name(name) ⇒ String

Get the name of the provided field as it is stored in the database.
#dot_dollar_field?(name) ⇒ true | false Internal use only Internal use only

Does this field start with a dollar sign ($) or contain a dot/period (.)?
#lazy_settable?(field, value) ⇒ true | false

Is the provided field a lazy evaluation?
#validate_writable_field_name!(name) Internal use only Internal use only

Validate whether or not the field starts with a dollar sign ($) or contains a dot/period (.).

DSL Calls

included

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 124


included do
  class_attribute :aliased_fields
  class_attribute :localized_fields
  class_attribute :fields
  class_attribute :pre_processed_defaults
  class_attribute :post_processed_defaults

  self.aliased_fields = { "id" => "_id" }
  self.fields = {}
  self.localized_fields = {}
  self.pre_processed_defaults = []
  self.post_processed_defaults = []

  field(
    :_id,
    default: ->{ BSON::ObjectId.new },
    pre_processed: true,
    type: BSON::ObjectId
  )

  alias_attribute(:id, :_id)
end

Class Method Details

.database_field_name(name, relations, aliased_fields, aliased_associations) ⇒ String

This method is for internal use only.

Get the name of the provided field as it is stored in the database. Used in determining if the field is aliased or not. Recursively finds aliases for embedded documents and fields, delimited with period “.” character.

Note that this method returns the name of associations as they’re stored in the database, whereas the ‘relations` hash uses their in-code aliases. In order to check for membership in the relations hash, you would first have to look up the string returned from this method in the aliased_associations hash.

This method will not expand the alias of a belongs_to association that is not the last item. For example, if we had a School that has_many Students, and the field name passed was (from the Student’s perspective):

school._id

The alias for a belongs_to association is that association’s _id field. Therefore, expanding out this association would yield:

school_id._id

This is not the correct field name, because the intention here was not to get a property of the _id field. The intention was to get a property of the referenced document. Therefore, if a part of the name passed is a belongs_to association that is not the last part of the name, we won’t expand its alias, and return:

school._id

If the belongs_to association is the last part of the name, we will pass back the _id field.

Parameters:

name (String | Symbol) —

The name to get.
relations (Hash) —

The associations.
aliased_fields (Hash) —

The aliased fields.
aliased_associations (Hash) —

The aliased associations.

Returns:

(String) —

The name of the field as stored in the database.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 410


def database_field_name(name, relations, aliased_fields, aliased_associations)
  return nil unless name.present?
  key = name.to_s
  segment, remaining = key.split('.', 2)

  # Don't get the alias for the field when a belongs_to association
  # is not the last item. Therefore, get the alias when one of the
  # following is true:
  # 1. This is the last item, i.e. there is no remaining.
  # 2. It is not an association.
  # 3. It is not a belongs association
  if !remaining || !relations.key?(segment) || !relations[segment].is_a?(Association::Referenced::BelongsTo)
    segment = aliased_fields[segment]&.dup || segment
  end

  return segment unless remaining

  relation = relations[aliased_associations[segment] || segment]
  if relation
    k = relation.klass
    "#{segment}.#{database_field_name(remaining, k.relations, k.aliased_fields, k.aliased_associations)}"
  else
    "#{segment}.#{remaining}"
  end
end

.option(option_name, &block)

Stores the provided block to be run when the option name specified is defined on a field.

No assumptions are made about what functionality the handler might perform, so it will always be called if the ‘option_name` key is provided in the field definition – even if it is false or nil.

Examples:

Mongoid::Fields.option :required do |model, field, value|
  model.validates_presence_of field if value
end

Parameters:

option_name (Symbol) —

the option name to match against
&block —

the handler to execute when the option is provided.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 293


def option(option_name, &block)
  options[option_name] = block
end

.options ⇒ Hash

Return a map of custom option names to their handlers.

Examples:

Mongoid::Fields.options
# => { :required => #<Proc:0x00000100976b38> }

Returns:

(Hash) —

the option map

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 304


def options
  @options ||= {}
end

.traverse_association_tree(key, fields, associations, aliased_associations) {|The, The, Whether| ... } ⇒ `Field`

This method is for internal use only.

Traverse down the association tree and search for the field for the given key. To do this, split the key by ‘.’ and for each part (meth) of the key:

If the meth is a field, yield the meth, field, and is_field as true.
If the meth is an association, update the klass to the association’s klass, and yield the meth, klass, and is_field as false.

The next iteration will use klass’s fields and associations to continue traversing the tree.

Parameters:

key (String) —

The key used to search the association tree.
fields (Hash) —

The fields to begin the search with.
associations (Hash) —

The associations to begin the search with.
aliased_associations (Hash) —

The alaised associations to begin the search with.
&block —

The block.

Yield Parameters:

The (Symbol) —

current method.
The (Symbol | String) —

field or the relation.
Whether (true | false) —

the second yield parameter is a field or not.

Returns:

(Field) —

The field found for the given key at the end of the search. This will return nil if the last thing found is an association or no field was found for the given key.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 335


def traverse_association_tree(key, fields, associations, aliased_associations)
  klass = nil
  field = nil
  key.split('.').each_with_index do |meth, i|
    fs = i == 0 ? fields : klass&.fields
    rs = i == 0 ? associations : klass&.relations
    as = i == 0 ? aliased_associations : klass&.aliased_associations

    # Associations can possibly have two "keys", their name and their alias.
    # The fields name is what is used to store it in the klass's relations
    # and field hashes, and the alias is what's used to store that field
    # in the database. The key inputted to this function is the aliased
    # key. We can convert them back to their names by looking in the
    # aliased_associations hash.
    aliased = meth
    if as && a = as.fetch(meth, nil)
      aliased = a.to_s
    end

    field = nil
    klass = nil
    if fs && f = fs[aliased]
      field = f
      yield(meth, f, true) if block_given?
    elsif rs && rel = rs[aliased]
      klass = rel.klass
      yield(meth, rel, false) if block_given?
    else
      yield(meth, nil, false) if block_given?
    end
  end
  field
end

Instance Attribute Details

#using_object_ids? ⇒ `true` | `false` (readonly)

Note:

Refactored from using delegate for class load performance.

Is the document using object ids?

Examples:

Is the document using object ids?

model.using_object_ids?

Returns:

(true | false) —

Using object ids.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 247


def using_object_ids?
  self.class.using_object_ids?
end

Instance Method Details

#apply_default(name)

Applies a single default value for the given name.

Examples:

Apply a single default.

model.apply_default("name")

Parameters:

name (String) —

The name of the field.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 178


def apply_default(name)
  unless attributes.key?(name)
    if field = fields[name]
      default = field.eval_default(self)
      unless default.nil? || field.lazy?
        attribute_will_change!(name)
        attributes[name] = default
      end
    end
  end
end

#apply_defaults

Apply all the defaults at once.

Examples:

Apply all the defaults.

model.apply_defaults

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 194


def apply_defaults
  pending_callbacks.delete(:apply_defaults)
  apply_pre_processed_defaults
  apply_post_processed_defaults
end

#apply_post_processed_defaults ⇒ Array<String>

Apply all default values to the document which are procs.

Examples:

Apply all the proc defaults.

model.apply_post_processed_defaults

Returns:

(Array<String>) —

The names of the proc defaults.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 165


def apply_post_processed_defaults
  pending_callbacks.delete(:apply_post_processed_defaults)
  post_processed_defaults.each do |name|
    apply_default(name)
  end
end

#apply_pre_processed_defaults ⇒ Array<String>

Apply all default values to the document which are not procs.

Examples:

Apply all the non-proc defaults.

model.apply_pre_processed_defaults

Returns:

(Array<String>) —

The names of the non-proc defaults.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 153


def apply_pre_processed_defaults
  pre_processed_defaults.each do |name|
    apply_default(name)
  end
end

#attribute_names ⇒ Array<String>

Returns an array of names for the attributes available on this object.

Provides the field names in an ORM-agnostic way. ::Rails v3.1+ uses this method to automatically wrap params in JSON requests.

Examples:

Get the field names

document.attribute_names

Returns:

(Array<String>) —

The field names

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 209


def attribute_names
  self.class.attribute_names
end

#database_field_name(name) ⇒ String

Get the name of the provided field as it is stored in the database. Used in determining if the field is aliased or not.

Examples:

Get the database field name.

model.database_field_name(:authorization)

Parameters:

name (String | Symbol) —

The name to get.

Returns:

(String) —

The name of the field as it’s stored in the db.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 222


def database_field_name(name)
  self.class.database_field_name(name)
end

#dot_dollar_field?(name) ⇒ `true` | `false`

This method is for internal use only.

Does this field start with a dollar sign ($) or contain a dot/period (.)?

Parameters:

name (String) —

The field name.

Returns:

(true | false) —

If this field is dotted or dollared.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 258


def dot_dollar_field?(name)
  n = aliased_fields[name] || name
  fields.key?(n) && (n.include?('.') || n.start_with?('$'))
end

#lazy_settable?(field, value) ⇒ `true` | `false`

Is the provided field a lazy evaluation?

Examples:

If the field is lazy settable.

doc.lazy_settable?(field, nil)

Parameters:

field (Field) —

The field.
value (Object) —

The current value.

Returns:

(true | false) —

If we set the field lazily.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 235


def lazy_settable?(field, value)
  !frozen? && value.nil? && field.lazy?
end

#validate_writable_field_name!(name)

This method is for internal use only.

Validate whether or not the field starts with a dollar sign ($) or contains a dot/period (.).

Parameters:

name (String) —

The field name.

Raises:

(InvalidDotDollarAssignment) —

If contains dots or starts with a dollar.

[ GitHub ]

# File 'lib/mongoid/fields.rb', line 271


def validate_writable_field_name!(name)
  if dot_dollar_field?(name)
    raise Errors::InvalidDotDollarAssignment.new(self.class, name)
  end
end

Module: Mongoid::Fields

Overview

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

DSL Calls

included

Class Method Details

.database_field_name(name, relations, aliased_fields, aliased_associations) ⇒ String

.option(option_name, &block)

.options ⇒ Hash

.traverse_association_tree(key, fields, associations, aliased_associations) {|The, The, Whether| ... } ⇒ Field

Instance Attribute Details

#using_object_ids? ⇒ true | false (readonly)

Instance Method Details

#apply_default(name)

#apply_defaults

#apply_post_processed_defaults ⇒ Array<String>

#apply_pre_processed_defaults ⇒ Array<String>

#attribute_names ⇒ Array<String>

#database_field_name(name) ⇒ String

#dot_dollar_field?(name) ⇒ true | false

#lazy_settable?(field, value) ⇒ true | false

#validate_writable_field_name!(name)

.traverse_association_tree(key, fields, associations, aliased_associations) {|The, The, Whether| ... } ⇒ `Field`

#using_object_ids? ⇒ `true` | `false` (readonly)

#dot_dollar_field?(name) ⇒ `true` | `false`

#lazy_settable?(field, value) ⇒ `true` | `false`