sqlalchemy.types Enum Example Code

Enum is a class within the sqlalchemy.types module of the SQLAlchemy project.

BOOLEAN, Boolean, DATE, DATETIME, Date, DateTime, FLOAT, Float, INTEGER, Integer, Interval, NULLTYPE, NullType, String, TEXT, TIME, Text, Time, TypeEngine, UserDefinedType, and to_instance are several other callables with code examples from the same sqlalchemy.types package.

Example 1 from graphene-sqlalchemy

graphene-sqlalchemy (project documentation and PyPI package information) is a SQLAlchemy integration for Graphene, which makes it easier to build GraphQL-based APIs into Python web applications. The package allows you to subclass SQLAlchemy classes and build queries around them with custom code to match the backend queries with the GraphQL-based request queries. The project is provided as open source under the MIT license.

graphene-sqlalchemy / graphene_sqlalchemy / enums.py

# enums.py
import six
from sqlalchemy.orm import ColumnProperty
from sqlalchemy.types import Enum as SQLAlchemyEnumType

from graphene import Argument, Enum, List

from .utils import EnumValue, to_enum_value_name, to_type_name


def _convert_sa_to_graphene_enum(sa_enum, fallback_name=None):
    if not isinstance(sa_enum, SQLAlchemyEnumType):
        raise TypeError(
            "Expected sqlalchemy.types.Enum, but got: {!r}".format(sa_enum)
        )
    enum_class = sa_enum.enum_class
    if enum_class:
        if all(to_enum_value_name(key) == key for key in enum_class.__members__):
            return Enum.from_enum(enum_class)
        name = enum_class.__name__
        members = [
            (to_enum_value_name(key), value.value)
            for key, value in enum_class.__members__.items()
        ]
    else:
        sql_enum_name = sa_enum.name
        if sql_enum_name:
            name = to_type_name(sql_enum_name)
        elif fallback_name:
            name = fallback_name
        else:
            raise TypeError("No type name specified for {!r}".format(sa_enum))
        members = [(to_enum_value_name(key), key) for key in sa_enum.enums]
    return Enum(name, members)


def enum_for_sa_enum(sa_enum, registry):
    if not isinstance(sa_enum, SQLAlchemyEnumType):
        raise TypeError(
            "Expected sqlalchemy.types.Enum, but got: {!r}".format(sa_enum)
        )
    enum = registry.get_graphene_enum_for_sa_enum(sa_enum)
    if not enum:
        enum = _convert_sa_to_graphene_enum(sa_enum)
        registry.register_enum(sa_enum, enum)
    return enum


def enum_for_field(obj_type, field_name):
    from .types import SQLAlchemyObjectType

    if not isinstance(obj_type, type) or not issubclass(obj_type, SQLAlchemyObjectType):
        raise TypeError(
            "Expected SQLAlchemyObjectType, but got: {!r}".format(obj_type))
    if not field_name or not isinstance(field_name, six.string_types):
        raise TypeError(
            "Expected a field name, but got: {!r}".format(field_name))
    registry = obj_type._meta.registry


## ... source file abbreviated to get to Enum examples ...


        if name != enum.__name__ or custom_options != enum.custom_options:
            raise ValueError(
                "Sort enum for {} has already been customized".format(obj_type)
            )
    else:
        members = []
        default = []
        fields = obj_type._meta.fields
        get_name = get_symbol_name or _default_sort_enum_symbol_name
        for field_name in fields:
            if only_fields and field_name not in only_fields:
                continue
            orm_field = registry.get_orm_field_for_graphene_field(obj_type, field_name)
            if not isinstance(orm_field, ColumnProperty):
                continue
            column = orm_field.columns[0]
            if only_indexed and not (column.primary_key or column.index):
                continue
            asc_name = get_name(column.name, True)
            asc_value = EnumValue(asc_name, column.asc())
            desc_name = get_name(column.name, False)
            desc_value = EnumValue(desc_name, column.desc())
            if column.primary_key:
                default.append(asc_value)
            members.extend(((asc_name, asc_value), (desc_name, desc_value)))
        enum = Enum(name, members)
        enum.default = default  # store default as attribute
        enum.custom_options = custom_options
        registry.register_sort_enum(obj_type, enum)
    return enum


def sort_argument_for_object_type(
    obj_type,
    enum_name=None,
    only_fields=None,
    only_indexed=None,
    get_symbol_name=None,
    has_default=True,
):
    enum = sort_enum_for_object_type(
        obj_type,
        enum_name,
        only_fields=only_fields,
        only_indexed=only_indexed,
        get_symbol_name=get_symbol_name,
    )
    if not has_default:
        enum.default = None



## ... source file continues with no further Enum examples...

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