method

remove_unique_constraint

v7.1.3.4 - Show latest stable - 0 notes - Class: SchemaStatements

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1
5.1.7
5.2.3
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2 (0)
7.1.3.4 (0)
What's this?

remove_unique_constraint(table_name, column_name = nil, **options) public

Removes the given unique constraint from the table.

remove_unique_constraint :sections, name: "unique_position"

The column_name parameter will be ignored if present. It can be helpful to provide this in a migration’s change method so it can be reverted. In that case, column_name will be used by #add_unique_constraint.

Show source

# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 771
        def remove_unique_constraint(table_name, column_name = nil, **options)
          unique_name_to_delete = unique_constraint_for!(table_name, column: column_name, **options).name

          at = create_alter_table(table_name)
          at.drop_unique_constraint(unique_name_to_delete)

          execute schema_creation.accept(at)
        end

remove_unique_constraint

Related methods