class Sequel::Postgres::AlterTableGenerator - Sequel: The Database Toolkit for Ruby

add_exclusion_constraint (elements, opts=OPTS)

Source

    # File lib/sequel/adapters/shared/postgres.rb
142 def add_exclusion_constraint(elements, opts=OPTS)
143   @operations << {:op => :add_constraint, :type => :exclude, :elements => elements}.merge!(opts)
144 end

Adds an exclusion constraint to an existing table, see CreateTableGenerator#exclude.

alter_constraint (name, opts=OPTS)

Source

    # File lib/sequel/adapters/shared/postgres.rb
153 def alter_constraint(name, opts=OPTS)
154   @operations << {:op => :alter_constraint, :name => name}.merge!(opts)
155 end

Alter an existing constraint. Options:

:deferrable

Modify deferrable setting for constraint (PostgreSQL 9.4+):

true: DEFERRABLE INITIALLY DEFERRED
false: NOT DEFERRABLE
:immediate: DEFERRABLE INITIALLY IMMEDIATE

:enforced

Set true to use ENFORCED, or false to use NOT ENFORCED (PostgreSQL 18+)

:inherit

Set true to use INHERIT, or false to use NO INHERIT (PostgreSQL 18+)

rename_constraint (name, new_name)

Source

    # File lib/sequel/adapters/shared/postgres.rb
158 def rename_constraint(name, new_name)
159   @operations << {:op => :rename_constraint, :name => name, :new_name => new_name}
160 end

:inherit: Set true to use INHERIT, or false to use NO INHERIT (PostgreSQL 18+)

validate_constraint (name)

Source

    # File lib/sequel/adapters/shared/postgres.rb
164 def validate_constraint(name)
165   @operations << {:op => :validate_constraint, :name => name}
166 end

Validate the constraint with the given name, which should have been added previously with NOT VALID.