method
change_column_default_for_alter
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Class: SchemaStatements
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change_column_default_for_alter(table_name, column_name, default_or_changes)
public
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# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 738 def change_column_default_for_alter(table_name, column_name, default_or_changes) column = column_for(table_name, column_name) return unless column default = extract_new_default_value(default_or_changes) alter_column_query = "ALTER COLUMN #{quote_column_name(column_name)} %s" if default.nil? # <tt>DEFAULT NULL</tt> results in the same behavior as <tt>DROP DEFAULT</tt>. However, PostgreSQL will # cast the default to the columns type, which leaves us with a default like "default NULL::character varying". alter_column_query % "DROP DEFAULT" else alter_column_query % "SET DEFAULT #{quote_default_expression(default, column)}" end end