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Class: ActiveRecord::ConnectionAdapters::Table

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
MySQL::Table, PostgreSQL::Table
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, ColumnMethods
Inherits: Object
Defined in: activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

Overview

Represents an SQL table in an abstract way for updating a table. Also see TableDefinition and connection.create_table

Available transformations are:

change_table :table do |t|
  t.primary_key
  t.column
  t.index
  t.rename_index
  t.timestamps
  t.change
  t.change_default
  t.change_null
  t.rename
  t.references
  t.belongs_to
  t.check_constraint
  t.string
  t.text
  t.integer
  t.bigint
  t.float
  t.decimal
  t.numeric
  t.datetime
  t.timestamp
  t.time
  t.date
  t.binary
  t.blob
  t.boolean
  t.foreign_key
  t.json
  t.virtual
  t.remove
  t.remove_foreign_key
  t.remove_references
  t.remove_belongs_to
  t.remove_index
  t.remove_check_constraint
  t.remove_timestamps
end

ColumnMethods - Attributes & Methods

Class Method Summary

Instance Attribute Summary

Instance Method Summary

ColumnMethods - Included

#column

Appends a column or columns of a specified type.
#primary_key

Appends a primary key definition to the table definition.

Constructor Details

.new(table_name, base) ⇒ Table

[ GitHub ] 

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 720



def initialize(table_name, base)
  @name = table_name
  @base = base
end


  







Instance Attribute Details



  

    #name   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 718



attr_reader :name


  







Instance Method Details



  

    #belongs_to(*args, **options)  
  



  

    

Alias for #references.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 877



alias :belongs_to :references


  








  

    #blob  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 327



alias :blob :binary


  








  

    #change(column_name, type, **options)  
  



  

    

Changes the column’s definition according to the new options.



t.change(:name, :string, limit: 80)
t.change(:description, :text)



See TableDefinition#column for details of the options you can use.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 797



def change(column_name, type, **options)
  raise_on_if_exist_options(options)
  @base.change_column(name, column_name, type, **options)
end


  








  

    #change_default(column_name, default_or_changes)  
  



  

    

Sets a new default value for a column.



t.change_default(:qualification, 'new')
t.change_default(:authorized, 1)
t.change_default(:status, from: nil, to: "draft")



See connection.change_column_default


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 809



def change_default(column_name, default_or_changes)
  @base.change_column_default(name, column_name, default_or_changes)
end


  








  

    #change_null(column_name, null, default = nil)  
  



  

    

Sets or removes a NOT NULL constraint on a column.



t.change_null(:qualification, true)
t.change_null(:qualification, false, 0)



See connection.change_column_null


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 819



def change_null(column_name, null, default = nil)
  @base.change_column_null(name, column_name, null, default)
end


  








  

    #check_constraint(*args, **options)  
  



  

    

Adds a check constraint.



t.check_constraint("price > 0", name: "price_check")



See connection.add_check_constraint


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 929



def check_constraint(*args, **options)
  @base.add_check_constraint(name, *args, **options)
end


  








  

    #check_constraint_exists?(*args, **options)  ⇒ Boolean 
  



  

    

Checks if a check_constraint exists on a table.



unless t.check_constraint_exists?(name: "price_check")
  t.check_constraint("price > 0", name: "price_check")
end



See connection.check_constraint_exists?


  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 949



def check_constraint_exists?(*args, **options)
  @base.check_constraint_exists?(name, *args, **options)
end


  








  

    #column(column_name, type, index: nil, **options)  
  



  

    

Adds a new column to the named table.



t.column(:name, :string)



See TableDefinition#column for details of the options you can use.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 730



def column(column_name, type, index: nil, **options)
  raise_on_if_exist_options(options)
  @base.add_column(name, column_name, type, **options)
  if index
    index_options = index.is_a?(Hash) ? index : {}
    index(column_name, **index_options)
  end
end


  








  

    #column_exists?(column_name, type = nil, **options)  ⇒ Boolean 
  



  

    

Checks to see if a column exists.



t.string(:name) unless t.column_exists?(:name, :string)



See connection.column_exists?


  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 744



def column_exists?(column_name, type = nil, **options)
  @base.column_exists?(name, column_name, type, **options)
end


  








  

    #foreign_key(*args, **options)  
  



  

    

Adds a foreign key to the table using a supplied table name.



t.foreign_key(:authors)
t.foreign_key(:authors, column: :author_id, primary_key: "id")



See connection.add_foreign_key


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 899



def foreign_key(*args, **options)
  raise_on_if_exist_options(options)
  @base.add_foreign_key(name, *args, **options)
end


  








  

    #foreign_key_exists?(*args, **options)  ⇒ Boolean 
  



  

    

Checks to see if a foreign key exists.



t.foreign_key(:authors) unless t.foreign_key_exists?(:authors)



See connection.foreign_key_exists?


  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 920



def foreign_key_exists?(*args, **options)
  @base.foreign_key_exists?(name, *args, **options)
end


  








  

    #index(column_name, **options)  
  



  

    

Adds a new index to the table. column_name can be a single ::Symbol, or an ::Array of Symbols.



t.index(:name)
t.index([:branch_id, :party_id], unique: true)
t.index([:branch_id, :party_id], unique: true, name: 'by_branch_party')



See connection.add_index for details of the options you can use.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 756



def index(column_name, **options)
  raise_on_if_exist_options(options)
  @base.add_index(name, column_name, **options)
end


  








  

    #index_exists?(column_name, **options)  ⇒ Boolean 
  



  

    

Checks to see if an index exists.



unless t.index_exists?(:branch_id)
  t.index(:branch_id)
end



See connection.index_exists?


  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 768



def index_exists?(column_name, **options)
  @base.index_exists?(name, column_name, **options)
end


  








  

    #numeric  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 328



alias :numeric :decimal


  








  

    #raise_on_if_exist_options(options)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 954



def raise_on_if_exist_options(options)
  unrecognized_option = options.keys.find do |key|
    key == :if_exists || key == :if_not_exists
  end
  if unrecognized_option
    conditional = unrecognized_option == :if_exists ? "if" : "unless"
    message = <<~TXT
      Option #{unrecognized_option} will be ignored. If you are calling an expression like
      `t.column(.., #{unrecognized_option}: true)` from inside a change_table block, try a
      conditional clause instead, as in `t.column(..) #{conditional} t.column_exists?(..)`
    TXT
    raise ArgumentError.new(message)
  end
end


  








  

    #references(*args, **options)  
    Also known as: #belongs_to
  



  

    

Adds a reference.



t.references(:user)
t.belongs_to(:supplier, foreign_key: true)



See connection.add_reference for details of the options you can use.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 871



def references(*args, **options)
  raise_on_if_exist_options(options)
  args.each do |ref_name|
    @base.add_reference(name, ref_name, **options)
  end
end


  








  

    #remove(*column_names, **options)  
  



  

    

Removes the column(s) from the table definition.



t.remove(:qualification)
t.remove(:qualification, :experience)



See connection.remove_columns


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 829



def remove(*column_names, **options)
  raise_on_if_exist_options(options)
  @base.remove_columns(name, *column_names, **options)
end


  








  

    #remove_belongs_to(*args, **options)  
  



  

    

Alias for #remove_references.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 891



alias :remove_belongs_to :remove_references


  








  

    #remove_check_constraint(*args, **options)  
  



  

    

Removes the given check constraint from the table.



t.remove_check_constraint(name: "price_check")



See connection.remove_check_constraint


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 938



def remove_check_constraint(*args, **options)
  @base.remove_check_constraint(name, *args, **options)
end


  








  

    #remove_foreign_key(*args, **options)  
  



  

    

Removes the given foreign key from the table.



t.remove_foreign_key(:authors)
t.remove_foreign_key(column: :author_id)



See connection.remove_foreign_key


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 910



def remove_foreign_key(*args, **options)
  raise_on_if_exist_options(options)
  @base.remove_foreign_key(name, *args, **options)
end


  








  

    #remove_index(column_name = nil, **options)  
  



  

    

Removes the given index from the table.



t.remove_index(:branch_id)
t.remove_index(column: [:branch_id, :party_id])
t.remove_index(name: :by_branch_party)
t.remove_index(:branch_id, name: :by_branch_party)



See connection.remove_index


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 842



def remove_index(column_name = nil, **options)
  raise_on_if_exist_options(options)
  @base.remove_index(name, column_name, **options)
end


  








  

    #remove_references(*args, **options)  
    Also known as: #remove_belongs_to
  



  

    

Removes a reference. Optionally removes a type column.



t.remove_references(:user)
t.remove_belongs_to(:supplier, polymorphic: true)



See connection.remove_reference


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 885



def remove_references(*args, **options)
  raise_on_if_exist_options(options)
  args.each do |ref_name|
    @base.remove_reference(name, ref_name, **options)
  end
end


  








  

    #remove_timestamps(**options)  
  



  

    

Removes the timestamp columns (created_at and updated_at) from the table.



t.remove_timestamps



See connection.remove_timestamps


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 852



def remove_timestamps(**options)
  @base.remove_timestamps(name, **options)
end


  








  

    #rename(column_name, new_column_name)  
  



  

    

Renames a column.



t.rename(:description, :name)



See connection.rename_column


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 861



def rename(column_name, new_column_name)
  @base.rename_column(name, column_name, new_column_name)
end


  








  

    #rename_index(index_name, new_index_name)  
  



  

    

Renames the given index on the table.



t.rename_index(:user_id, :)



See connection.rename_index


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 777



def rename_index(index_name, new_index_name)
  @base.rename_index(name, index_name, new_index_name)
end


  








  

    #timestamps(**options)  
  



  

    

Adds timestamps (created_at and updated_at) columns to the table.



t.timestamps(null: false)



See connection.add_timestamps


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 786



def timestamps(**options)
  raise_on_if_exist_options(options)
  @base.add_timestamps(name, **options)
end