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PeeWee Postgres Enum Field
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from peewee import * | |
class BModel(Model): | |
class Meta: | |
database = db | |
@classmethod | |
def create_table(cls, *args, **kwargs): | |
for field in cls._meta.get_fields(): | |
if hasattr(field, "pre_field_create"): | |
field.pre_field_create(cls) | |
cls._meta.database.create_table(cls) | |
for field in cls._meta.get_fields(): | |
if hasattr(field, "post_field_create"): | |
field.post_field_create(cls) | |
class EnumField(Field): | |
db_field = "enum" | |
def pre_field_create(self, model): | |
field = "e_%s" % self.name | |
self.get_database().get_conn().cursor().execute( | |
"DROP TYPE IF EXISTS %s;" % field | |
) | |
query = self.get_database().get_conn().cursor() | |
tail = ', '.join(["'%s'"] * len(self.choices)) % tuple(self.choices) | |
q = "CREATE TYPE %s AS ENUM (%s);" % (field, tail) | |
query.execute(q) | |
def post_field_create(self, model): | |
self.db_field = "e_%s" % self.name | |
def coerce(self, value): | |
if value not in self.choices: | |
raise Exception("Invalid Enum Value `%s`", value) | |
return str(value) | |
def get_column_type(self): | |
return "enum" | |
def __ddl_column__(self, ctype): | |
return SQL("e_%s" % self.name) | |
class Example(BModel): | |
enum = EnumField(choices=["a", "b", "c"]) | |
Example.create(enum="a") | |
Example.get(id=1).enum # "a" |
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See also: https://github.com/juancarlospaco/peewee-extra-fields/blob/master/peewee_extra_fields/__init__.py#L1020