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70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
from sqlalchemy.orm import Query
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from ...core.exceptions import SkipField
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from ...core.fields import Field
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from ...core.types.base import FieldType
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from ...core.types.definitions import List
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from ...relay import ConnectionField
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from ...relay.utils import is_node
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from ...utils import LazyMap
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from .utils import get_type_for_model
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class SQLAlchemyConnectionField(ConnectionField):
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def wrap_resolved(self, value, instance, args, info):
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if isinstance(value, Query):
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return LazyMap(value, self.type)
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return value
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class LazyListField(Field):
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def get_type(self, schema):
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return List(self.type)
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def resolver(self, instance, args, info):
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resolved = super(LazyListField, self).resolver(instance, args, info)
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return LazyMap(resolved, self.type)
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class ConnectionOrListField(Field):
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def internal_type(self, schema):
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model_field = self.type
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field_object_type = model_field.get_object_type(schema)
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if not field_object_type:
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raise SkipField()
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if is_node(field_object_type):
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field = SQLAlchemyConnectionField(field_object_type)
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else:
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field = LazyListField(field_object_type)
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field.contribute_to_class(self.object_type, self.attname)
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return schema.T(field)
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class SQLAlchemyModelField(FieldType):
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def __init__(self, model, *args, **kwargs):
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self.model = model
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super(SQLAlchemyModelField, self).__init__(*args, **kwargs)
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def internal_type(self, schema):
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_type = self.get_object_type(schema)
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if not _type and self.parent._meta.only_fields:
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raise Exception(
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"Table %r is not accessible by the schema. "
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"You can either register the type manually "
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"using @schema.register. "
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"Or disable the field in %s" % (
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self.model,
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self.parent,
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)
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)
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if not _type:
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raise SkipField()
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return schema.T(_type)
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def get_object_type(self, schema):
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return get_type_for_model(schema, self.model)
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