module ActiveRecord::ConnectionAdapters::ColumnDumper
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
Public Instance Methods
column_spec(column, types)
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# File lib/active_record/connection_adapters/abstract/schema_dumper.rb, line 9 def column_spec(column, types) spec = prepare_column_options(column, types) (spec.keys - [:name, :type]).each{ |k| spec[k].insert(0, "#{k}: ")} spec end
migration_keys()
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Lists the valid migration options
# File lib/active_record/connection_adapters/abstract/schema_dumper.rb, line 36 def migration_keys [:name, :limit, :precision, :scale, :default, :null] end
prepare_column_options(column, types)
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This can be overridden on a Adapter level basis to support other extended datatypes (Example: Adding an array option in the PostgreSQLAdapter)
# File lib/active_record/connection_adapters/abstract/schema_dumper.rb, line 18 def prepare_column_options(column, types) spec = {} spec[:name] = column.name.inspect spec[:type] = column.type.to_s spec[:null] = 'false' unless column.null limit = column.limit || types[column.type][:limit] spec[:limit] = limit.inspect if limit spec[:precision] = column.precision.inspect if column.precision spec[:scale] = column.scale.inspect if column.scale default = schema_default(column) if column.has_default? spec[:default] = default unless default.nil? spec end
Private Instance Methods
schema_default(column)
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# File lib/active_record/connection_adapters/abstract/schema_dumper.rb, line 42 def schema_default(column) default = column.type_cast_from_database(column.default) unless default.nil? column.type_cast_for_schema(default) end end