method

remove_foreign_key

v6.0.0 - Show latest stable - 0 notes - Class: ActiveRecord::ConnectionAdapters::SchemaStatements

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What's this?

remove_foreign_key(from_table, to_table = nil, **options) public

Removes the given foreign key from the table. Any option parameters provided will be used to re-add the foreign key in case of a migration rollback. It is recommended that you provide any options used when creating the foreign key so that the migration can be reverted properly.

Removes the foreign key on accounts.branch_id.

remove_foreign_key :accounts, :branches

Removes the foreign key on accounts.owner_id.

remove_foreign_key :accounts, column: :owner_id

Removes the foreign key on accounts.owner_id.

remove_foreign_key :accounts, to_table: :owners

Removes the foreign key named special_fk_name on the accounts table.

remove_foreign_key :accounts, name: :special_fk_name

The options hash accepts the same keys as SchemaStatements#add_foreign_key with an addition of

:to_table: The name of the table that contains the referenced primary key.

Show source

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 1026
      def remove_foreign_key(from_table, to_table = nil, **options)
        return unless supports_foreign_keys?

        fk_name_to_delete = foreign_key_for!(from_table, to_table: to_table, **options).name

        at = create_alter_table from_table
        at.drop_foreign_key fk_name_to_delete

        execute schema_creation.accept(at)
      end

remove_foreign_key

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