Class: ActiveRecord::ConnectionAdapters::Table

### Home Classes Methods

### In Files

- lib/active_record/connection_adapters/abstract/schema_definitions.rb

### Parent

Object

### Methods

- ::new
- #belongs_to
- #change
- #change_default
- #column
- #column_exists?
- #index
- #index_exists?
- #references
- #remove
- #remove_belongs_to
- #remove_index
- #remove_references
- #remove_timestamps
- #rename
- #timestamps

### Files

- README.rdoc

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# ActiveRecord::ConnectionAdapters::Table

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

Available transformations are:

    change_table :table do |t|
      t.column
      t.index
      t.timestamps
      t.change
      t.change_default
      t.rename
      t.references
      t.belongs_to
      t.string
      t.text
      t.integer
      t.float
      t.decimal
      t.datetime
      t.timestamp
      t.time
      t.date
      t.binary
      t.boolean
      t.remove
      t.remove_references
      t.remove_belongs_to
      t.remove_index
      t.remove_timestamps
    end

### Public Class Methods

new(table_name, base) click to toggle source

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 573
    def initialize(table_name, base)
      @table_name = table_name
      @base = base
    end

### Public Instance Methods

belongs_to(*args) click to toggle source
Alias for: references
change(column_name, type, options = {}) click to toggle source

Changes the column’s definition according to the new options. See TableDefinition#column for details of the options you can use.

##### Examples

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

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 623
    def change(column_name, type, options = {})
      @base.change_column(@table_name, column_name, type, options)
    end

change_default(column_name, default) click to toggle source

Sets a new default value for a column. See SchemaStatements#change_column_default

##### Examples

    t.change_default(:qualification, 'new')
    t.change_default(:authorized, 1)

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 631
    def change_default(column_name, default)
      @base.change_column_default(@table_name, column_name, default)
    end

column(column_name, type, options = {}) click to toggle source

Adds a new column to the named table. See TableDefinition#column for details of the options you can use.

##### Example

###### Creating a simple column

    t.column(:name, :string)

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 583
    def column(column_name, type, options = {})
      @base.add_column(@table_name, column_name, type, options)
    end

column_exists?(column_name, type = nil, options = nil) click to toggle source

Checks to see if a column exists. See SchemaStatements#column_exists?

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 588
    def column_exists?(column_name, type = nil, options = nil)
      @base.column_exists?(@table_name, column_name, type, options)
    end

index(column_name, options = {}) click to toggle source

Adds a new index to the table. `column_name` can be a single Symbol, or an Array of Symbols. See SchemaStatements#add_index

##### Examples

###### Creating a simple index

    t.index(:name)

###### Creating a unique index

    t.index([:branch_id, :party_id], :unique => true)

###### Creating a named index

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

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 602
    def index(column_name, options = {})
      @base.add_index(@table_name, column_name, options)
    end

index_exists?(column_name, options = {}) click to toggle source

Checks to see if an index exists. See SchemaStatements#index_exists?

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 607
    def index_exists?(column_name, options = {})
      @base.index_exists?(@table_name, column_name, options)
    end

references(*args) click to toggle source

Adds a reference. Optionally adds a `type` column. `references` and `belongs_to` are acceptable.

##### Examples

    t.references(:goat)
    t.references(:goat, :polymorphic => true)
    t.belongs_to(:goat)

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 678
    def references(*args)
      options = args.extract_options!
      polymorphic = options.delete(:polymorphic)
      args.each do |col|
        @base.add_column(@table_name, "#{col}_id", :integer, options)
        @base.add_column(@table_name, "#{col}_type", :string, polymorphic.is_a?(Hash) ? polymorphic : options) unless polymorphic.nil?
      end
    end

Also aliased as: belongs_to
remove(*column_names) click to toggle source

Removes the column(s) from the table definition.

##### Examples

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

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 639
    def remove(*column_names)
      @base.remove_column(@table_name, column_names)
    end

remove_belongs_to(*args) click to toggle source
Alias for: remove_references
remove_index(options = {}) click to toggle source

Removes the given index from the table.

##### Examples

###### Remove the suppliers_name_index in the suppliers table

    t.remove_index :name

###### Remove the index named accounts_branch_id_index in the accounts table

    t.remove_index :column => :branch_id

###### Remove the index named accounts_branch_id_party_id_index in the accounts table

    t.remove_index :column => [:branch_id, :party_id]

###### Remove the index named by_branch_party in the accounts table

    t.remove_index :name => :by_branch_party

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 654
    def remove_index(options = {})
      @base.remove_index(@table_name, options)
    end

remove_references(*args) click to toggle source

Removes a reference. Optionally removes a `type` column. `remove_references` and `remove_belongs_to` are acceptable.

##### Examples

    t.remove_references(:goat)
    t.remove_references(:goat, :polymorphic => true)
    t.remove_belongs_to(:goat)

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 694
    def remove_references(*args)
      options = args.extract_options!
      polymorphic = options.delete(:polymorphic)
      args.each do |col|
        @base.remove_column(@table_name, "#{col}_id")
        @base.remove_column(@table_name, "#{col}_type") unless polymorphic.nil?
      end
    end

Also aliased as: remove_belongs_to
remove_timestamps() click to toggle source

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

##### Example

    t.remove_timestamps

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 661
    def remove_timestamps
      @base.remove_timestamps(@table_name)
    end

rename(column_name, new_column_name) click to toggle source

Renames a column.

##### Example

    t.rename(:description, :name)

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 668
    def rename(column_name, new_column_name)
      @base.rename_column(@table_name, column_name, new_column_name)
    end

timestamps() click to toggle source

Adds timestamps (created_at and updated_at) columns to the table. See SchemaStatements#add_timestamps

##### Example

    t.timestamps

    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 614
    def timestamps
      @base.add_timestamps(@table_name)
    end

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