method

change_column_null

v7.1.3.4 - Show latest stable - 0 notes - Class: ActiveRecord::ConnectionAdapters::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 (0)
4.1.8 (0)
4.2.1 (0)
4.2.7 (0)
4.2.9 (0)
5.0.0.1 (38)
5.1.7 (0)
5.2.3 (0)
6.0.0 (0)
6.1.3.1 (0)
6.1.7.7 (0)
7.0.0 (0)
7.1.3.2 (0)
7.1.3.4 (0)
What's this?

change_column_null(table_name, column_name, null, default = nil) public

Sets or removes a NOT NULL constraint on a column. The null flag indicates whether the value can be NULL. For example

change_column_null(:users, :nickname, false)

says nicknames cannot be NULL (adds the constraint), whereas

change_column_null(:users, :nickname, true)

allows them to be NULL (drops the constraint).

The method accepts an optional fourth argument to replace existing NULLs with some other value. Use that one when enabling the constraint if needed, since otherwise those rows would not be valid.

Please note the fourth argument does not set a column’s default.

Show source

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 742
      def change_column_null(table_name, column_name, null, default = nil)
        raise NotImplementedError, "change_column_null is not implemented"
      end

change_column_null

Related methods