edge badge

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

Available transformations are:

change_table :table do |t|
  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.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
Methods
B
C
I
N
R
T
Attributes
[R] name
Class Public methods
new(table_name, base)
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 487
def initialize(table_name, base)
  @name = table_name
  @base = base
end
Instance Public methods
belongs_to(*args)
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 ActiveRecord::ConnectionAdapters::TableDefinition#column for details of the options you can use.

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 551
def change(column_name, type, options = {})
  @base.change_column(name, column_name, type, options)
end
change_default(column_name, default)

Sets a new default value for a column.

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

See ActiveRecord::ConnectionAdapters::SchemaStatements#change_column_default

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 561
def change_default(column_name, default)
  @base.change_column_default(name, column_name, default)
end
column(column_name, type, options = {})

Adds a new column to the named table.

t.column(:name, :string)

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

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 497
def column(column_name, type, options = {})
  @base.add_column(name, column_name, type, options)
end
column_exists?(column_name, type = nil, options = {})
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 504
def column_exists?(column_name, type = nil, options = {})
  @base.column_exists?(name, column_name, type, 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 ActiveRecord::ConnectionAdapters::SchemaStatements#add_index for details of the options you can use.

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 516
def index(column_name, options = {})
  @base.add_index(name, column_name, options)
end
index_exists?(column_name, options = {})
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 523
def index_exists?(column_name, options = {})
  @base.index_exists?(name, column_name, options)
end
references(*args)

Adds a reference. Optionally adds a type column, if :polymorphic option is provided.

t.references(:user)
t.references(:user, type: "string")
t.belongs_to(:supplier, polymorphic: true)
t.belongs_to(:supplier, foreign_key: true)

See ActiveRecord::ConnectionAdapters::SchemaStatements#add_reference

Also aliased as: belongs_to
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 613
def references(*args)
  options = args.extract_options!
  args.each do |ref_name|
    @base.add_reference(name, ref_name, options)
  end
end
remove(*column_names)

Removes the column(s) from the table definition.

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

See ActiveRecord::ConnectionAdapters::SchemaStatements#remove_columns

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 571
def remove(*column_names)
  @base.remove_columns(name, *column_names)
end
remove_belongs_to(*args)
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 ActiveRecord::ConnectionAdapters::SchemaStatements#remove_index

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 582
def remove_index(options = {})
  @base.remove_index(name, options)
end
remove_references(*args)

Removes a reference. Optionally removes a type column.

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

See ActiveRecord::ConnectionAdapters::SchemaStatements#remove_reference

Also aliased as: remove_belongs_to
# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 627
def remove_references(*args)
  options = args.extract_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 ActiveRecord::ConnectionAdapters::SchemaStatements#remove_timestamps

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 591
def remove_timestamps(options = {})
  @base.remove_timestamps(name, options)
end
rename(column_name, new_column_name)

Renames a column.

t.rename(:description, :name)

See ActiveRecord::ConnectionAdapters::SchemaStatements#rename_column

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 600
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, :account_id)

See ActiveRecord::ConnectionAdapters::SchemaStatements#rename_index

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 532
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 ActiveRecord::ConnectionAdapters::SchemaStatements#add_timestamps

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 541
def timestamps(options = {})
  @base.add_timestamps(name, options)
end