instance method `change_column_null`

Ruby on Rails 4.1.16

Since v4.0.13

Available in: v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

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

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 +NULL+s 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.

Parameters

table_name req
column_name req
null req
default opt = nil

Source

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 439
      def change_column_null(table_name, column_name, null, default = nil)
        raise NotImplementedError, "change_column_null is not implemented"
      end

Defined in activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb line 439 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::ConnectionAdapters::SchemaStatements

Signature

Parameters