Class | ActiveRecord::ConnectionAdapters::Table |
In: |
lib/active_record/connection_adapters/abstract/schema_definitions.rb
|
Parent: | Object |
Represents a 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
Changes the column‘s definition according to the new options. See TableDefinition#column for details of the options you can use.
t.change(:name, :string, :limit => 80) t.change(:description, :text)
Sets a new default value for a column. See SchemaStatements#change_column_default
t.change_default(:qualification, 'new') t.change_default(:authorized, 1)
Adds a new column to the named table. See TableDefinition#column for details of the options you can use.
t.column(:name, :string)
Adds a new index to the table. column_name can be a single Symbol, or an Array of Symbols. See SchemaStatements#add_index
t.index(:name)
t.index([:branch_id, :party_id], :unique => true)
t.index([:branch_id, :party_id], :unique => true, :name => 'by_branch_party')
Adds a reference. Optionally adds a type column. references and belongs_to are acceptable.
t.references(:goat) t.references(:goat, :polymorphic => true) t.belongs_to(:goat)
Removes the column(s) from the table definition.
t.remove(:qualification) t.remove(:qualification, :experience)
Removes the given index from the table.
t.remove_index :name
t.remove_index :column => :branch_id
t.remove_index :column => [:branch_id, :party_id]
t.remove_index :name => :by_branch_party
Removes a reference. Optionally removes a type column. remove_references and remove_belongs_to are acceptable.
t.remove_references(:goat) t.remove_references(:goat, :polymorphic => true) t.remove_belongs_to(:goat)
Removes the timestamp columns (created_at and updated_at) from the table.
t.remove_timestamps
Adds timestamps (created_at and updated_at) columns to the table. See SchemaStatements#add_timestamps
t.timestamps