The goal of this module is to move Adapter specific column definitions to the Adapter instead of having it in the schema dumper itself. This code represents the normal case. We can then redefine how certain data types may be handled in the schema dumper on the Adapter level by over-writing this code inside the database specific adapters
Methods
Instance Public methods
column_spec(column, types)
Link
migration_keys()
Link
Lists the valid migration options
prepare_column_options(column, types)
Link
This can be overridden on a Adapter level basis to support other extended datatypes (Example: Adding an array option in the PostgreSQLAdapter)
# File activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb, line 20 def prepare_column_options(column, types) spec = {} spec[:name] = column.name.inspect # AR has an optimization which handles zero-scale decimals as integers. This # code ensures that the dumper still dumps the column as a decimal. spec[:type] = if column.type == :integer && /^(numeric|decimal)/ =~ column.sql_type 'decimal' else column.type.to_s end spec[:limit] = column.limit.inspect if column.limit != types[column.type][:limit] && spec[:type] != 'decimal' spec[:precision] = column.precision.inspect if column.precision spec[:scale] = column.scale.inspect if column.scale spec[:null] = 'false' unless column.null spec[:default] = default_string(column.default) if column.has_default? spec end