Meta class reference¶
This document covers features of the Meta class. The meta class
defines model specific settings.
Note
Technically, Meta is just a container and forwarded to data-migrator.models.options.Options
Field options¶
The following arguments are available to all field types. All are optional.
drop_if_none¶
-
Meta.drop_if_none¶
Is a list of field names as defined. If set data-migrator will check if fields are not None and drop if one of the columns is.
Any field listed in this attribute is checked after scanning and just before save-ing.
Note
Note that only NullXXXFields actually can be None after scanning and parsing. Non
Null fields are set to their default value.
drop_non_unique¶
-
Meta.drop_non_unique¶
If True, data-migrator will drop values if the column uniqueness check fails
(after parsing). Default is False.
Any field can be defined as a unique column. Any field set so, is checked after scanning and just before save-ing.
fail_non_unique¶
-
Meta.fail_non_unique¶
If True, data-migrator will fail as a whole if the column uniqueness check fails
(after parsing). Default is False.
Any field can be defined as a unique column. Any field set so, is checked after scanning and just before save-ing.
fail_non_validated¶
-
Meta.fail_non_validated¶
If True, data-migrator will fail as a whole if the column validation check fails
(after parsing). Default is False.
Any field can have its own validator, this is a rough method to prevent bad data from being transformed and loaded.
file_name¶
-
Meta.file_name¶
If set, data-migrator will use this as file_name for the emitter instead of the default filename based on table_name.
table_name¶
-
Meta.table_name¶
If set, data-migrator will use this as table_name for the emitter instead of the default tablename based on model_name.
prefix¶
-
Meta.prefix¶
If set, data-migrator will use this list of statements as a preamble in the generation of the output statements. By default an emitter uses this to clear the old records.