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134 lines
4.8 KiB
Python
134 lines
4.8 KiB
Python
from singledispatch import singledispatch
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from sqlalchemy import types
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from sqlalchemy.orm import interfaces
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from sqlalchemy.dialects import postgresql
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from graphene import Enum, ID, Boolean, Float, Int, String, List, Field, Dynamic
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from graphene.relay import is_node
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from graphene.types.json import JSONString
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from .fields import SQLAlchemyConnectionField
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try:
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from sqlalchemy_utils import ChoiceType, ScalarListType
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except ImportError:
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class ChoiceType(object):
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pass
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class ScalarListType(object):
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pass
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def convert_sqlalchemy_relationship(relationship, registry):
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direction = relationship.direction
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model = relationship.mapper.entity
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def dynamic_type():
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_type = registry.get_type_for_model(model)
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if not _type:
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return None
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if (direction == interfaces.MANYTOONE or not relationship.uselist):
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return Field(_type)
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elif (direction == interfaces.ONETOMANY or
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direction == interfaces.MANYTOMANY):
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if is_node(_type):
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return SQLAlchemyConnectionField(_type)
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return Field(List(_type))
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return Dynamic(dynamic_type)
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def convert_sqlalchemy_composite(composite, registry):
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converter = registry.get_converter_for_composite(composite.composite_class)
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if not converter:
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try:
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raise Exception(
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"Don't know how to convert the composite field %s (%s)" %
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(composite, composite.composite_class))
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except AttributeError:
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# handle fields that are not attached to a class yet (don't have a parent)
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raise Exception(
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"Don't know how to convert the composite field %r (%s)" %
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(composite, composite.composite_class))
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return converter(composite, registry)
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def _register_composite_class(cls, registry=None):
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if registry is None:
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from .registry import get_global_registry
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registry = get_global_registry()
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def inner(fn):
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registry.register_composite_converter(cls, fn)
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return inner
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convert_sqlalchemy_composite.register = _register_composite_class
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def convert_sqlalchemy_column(column, registry=None):
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return convert_sqlalchemy_type(getattr(column, 'type', None), column, registry)
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@singledispatch
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def convert_sqlalchemy_type(type, column, registry=None):
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raise Exception(
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"Don't know how to convert the SQLAlchemy field %s (%s)" % (column, column.__class__))
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@convert_sqlalchemy_type.register(types.Date)
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@convert_sqlalchemy_type.register(types.DateTime)
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@convert_sqlalchemy_type.register(types.Time)
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@convert_sqlalchemy_type.register(types.String)
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@convert_sqlalchemy_type.register(types.Text)
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@convert_sqlalchemy_type.register(types.Unicode)
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@convert_sqlalchemy_type.register(types.UnicodeText)
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@convert_sqlalchemy_type.register(types.Enum)
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@convert_sqlalchemy_type.register(postgresql.ENUM)
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@convert_sqlalchemy_type.register(postgresql.UUID)
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def convert_column_to_string(type, column, registry=None):
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return String(description=column.doc, required=not(column.nullable))
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@convert_sqlalchemy_type.register(types.SmallInteger)
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@convert_sqlalchemy_type.register(types.BigInteger)
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@convert_sqlalchemy_type.register(types.Integer)
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def convert_column_to_int_or_id(type, column, registry=None):
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if column.primary_key:
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return ID(description=column.doc, required=not(column.nullable))
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else:
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return Int(description=column.doc, required=not(column.nullable))
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@convert_sqlalchemy_type.register(types.Boolean)
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def convert_column_to_boolean(type, column, registry=None):
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return Boolean(description=column.doc, required=not(column.nullable))
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@convert_sqlalchemy_type.register(types.Float)
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@convert_sqlalchemy_type.register(types.Numeric)
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def convert_column_to_float(type, column, registry=None):
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return Float(description=column.doc, required=not(column.nullable))
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@convert_sqlalchemy_type.register(ChoiceType)
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def convert_column_to_enum(type, column, registry=None):
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name = '{}_{}'.format(column.table.name, column.name).upper()
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return Enum(name, type.choices, description=column.doc)
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@convert_sqlalchemy_type.register(ScalarListType)
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def convert_scalar_list_to_list(type, column, registry=None):
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return List(String, description=column.doc)
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@convert_sqlalchemy_type.register(postgresql.ARRAY)
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def convert_postgres_array_to_list(type, column, registry=None):
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graphene_type = convert_sqlalchemy_type(column.type.item_type, column)
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return List(graphene_type, description=column.doc, required=not(column.nullable))
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@convert_sqlalchemy_type.register(postgresql.HSTORE)
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@convert_sqlalchemy_type.register(postgresql.JSON)
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@convert_sqlalchemy_type.register(postgresql.JSONB)
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def convert_json_to_string(type, column, registry=None):
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return JSONString(description=column.doc, required=not(column.nullable))
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