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.rename
  t.references
  t.belongs_to
  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.boolean
  t.foreign_key
  t.json
  t.virtual
  t.remove
  t.remove_references
  t.remove_belongs_to
  t.remove_index
  t.remove_timestamps
end

Methods

Included Modules

Attributes

[R] name

Class Public methods

new(table_name, base)

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 516
      def initialize(table_name, base)
        @name = table_name
        @base = base
      end
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Instance Public methods

belongs_to(*args, **options)

Alias for: references

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.

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 586
      def change(column_name, type, options = {})
        @base.change_column(name, column_name, type, options)
      end
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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

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 597
      def change_default(column_name, default_or_changes)
        @base.change_column_default(name, column_name, default_or_changes)
      end
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column(column_name, type, options = {})

Adds a new column to the named table.

t.column(:name, :string)

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

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 526
      def column(column_name, type, options = {})
        @base.add_column(name, column_name, type, options)
      end
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column_exists?(column_name, type = nil, options = {})

Checks to see if a column exists.

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

See connection.column_exists?

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 535
      def column_exists?(column_name, type = nil, options = {})
        @base.column_exists?(name, column_name, type, options)
      end
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foreign_key(*args)

Adds a foreign key.

t.foreign_key(:authors)

See connection.add_foreign_key

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 671
      def foreign_key(*args)
        @base.add_foreign_key(name, *args)
      end
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foreign_key_exists?(*args)

Checks to see if a foreign key exists.

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

See connection.foreign_key_exists?

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 680
      def foreign_key_exists?(*args)
        @base.foreign_key_exists?(name, *args)
      end
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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.

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 547
      def index(column_name, options = {})
        @base.add_index(name, column_name, options)
      end
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index_exists?(column_name, options = {})

Checks to see if an index exists.

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

See connection.index_exists?

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 558
      def index_exists?(column_name, options = {})
        @base.index_exists?(name, column_name, options)
      end
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references(*args, **options)

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.

Also aliased as: belongs_to
📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 646
      def references(*args, **options)
        args.each do |ref_name|
          @base.add_reference(name, ref_name, options)
        end
      end
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remove(*column_names)

Removes the column(s) from the table definition.

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

See connection.remove_columns

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 607
      def remove(*column_names)
        @base.remove_columns(name, *column_names)
      end
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remove_belongs_to(*args, **options)

Alias for: remove_references

remove_index(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)

See connection.remove_index

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 618
      def remove_index(options = {})
        @base.remove_index(name, options)
      end
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remove_references(*args, **options)

Removes a reference. Optionally removes a type column.

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

See connection.remove_reference

Also aliased as: remove_belongs_to
📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 659
      def remove_references(*args, **options)
        args.each do |ref_name|
          @base.remove_reference(name, ref_name, options)
        end
      end
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remove_timestamps(options = {})

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

t.remove_timestamps

See connection.remove_timestamps

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 627
      def remove_timestamps(options = {})
        @base.remove_timestamps(name, options)
      end
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rename(column_name, new_column_name)

Renames a column.

t.rename(:description, :name)

See connection.rename_column

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 636
      def rename(column_name, new_column_name)
        @base.rename_column(name, column_name, new_column_name)
      end
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rename_index(index_name, new_index_name)

Renames the given index on the table.

t.rename_index(:user_id, :account_id)

See connection.rename_index

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 567
      def rename_index(index_name, new_index_name)
        @base.rename_index(name, index_name, new_index_name)
      end
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timestamps(options = {})

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

t.timestamps(null: false)

See connection.add_timestamps

📝 Source code 
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 576
      def timestamps(options = {})
        @base.add_timestamps(name, options)
      end
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