method
change_column
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Class: SchemaStatements
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change_column(table_name, column_name, type, options = {})
public
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# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 414 def change_column(table_name, column_name, type, options = {}) #:nodoc: clear_cache! quoted_table_name = quote_table_name(table_name) quoted_column_name = quote_column_name(column_name) sql_type = type_to_sql(type, options) sql = "ALTER TABLE #{quoted_table_name} ALTER COLUMN #{quoted_column_name} TYPE #{sql_type}" if options[:collation] sql << " COLLATE \"#{options[:collation]}\"" end if options[:using] sql << " USING #{options[:using]}" elsif options[:cast_as] cast_as_type = type_to_sql(options[:cast_as], options) sql << " USING CAST(#{quoted_column_name} AS #{cast_as_type})" end execute sql change_column_default(table_name, column_name, options[:default]) if options.key?(:default) change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null) change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment) end