/
forms.py
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/
forms.py
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"""
The converters are from Flask-Admin project.
"""
import enum
import inspect
import sys
from typing import (
Any,
Callable,
Dict,
List,
Optional,
Sequence,
Tuple,
Type,
TypeVar,
Union,
no_type_check,
)
import anyio
from sqlalchemy import Boolean, select
from sqlalchemy import inspect as sqlalchemy_inspect
from sqlalchemy.orm import ColumnProperty, RelationshipProperty, sessionmaker
from sqlalchemy.sql.schema import Column
from wtforms import (
BooleanField,
DecimalField,
Field,
Form,
IntegerField,
StringField,
TextAreaField,
TimeField,
validators,
)
from wtforms.fields.core import UnboundField
from sqladmin._types import MODEL_PROPERTY
from sqladmin._validators import (
ColorValidator,
CurrencyValidator,
PhoneNumberValidator,
TimezoneValidator,
)
from sqladmin.ajax import QueryAjaxModelLoader
from sqladmin.exceptions import NoConverterFound
from sqladmin.fields import (
AjaxSelectField,
AjaxSelectMultipleField,
DateField,
DateTimeField,
FileField,
IntervalField,
JSONField,
QuerySelectField,
QuerySelectMultipleField,
Select2TagsField,
SelectField,
)
from sqladmin.helpers import (
choice_type_coerce_factory,
get_direction,
get_object_identifier,
is_async_session_maker,
is_relationship,
)
if sys.version_info >= (3, 8):
from typing import Protocol
else:
from typing_extensions import Protocol
class Validator(Protocol):
def __init__(self, *args: Any, **kwargs: Any) -> None:
... # pragma: no cover
def __call__(self, form: Form, field: Field) -> None:
... # pragma: no cover
class ConverterCallable(Protocol):
def __call__(
self,
model: type,
prop: MODEL_PROPERTY,
kwargs: Dict[str, Any],
) -> UnboundField:
... # pragma: no cover
T_CC = TypeVar("T_CC", bound=ConverterCallable)
_WTFORMS_PRIVATE_ATTRS = {"data", "errors", "process", "validate", "populate_obj"}
WTFORMS_ATTRS = {key: key + "_" for key in _WTFORMS_PRIVATE_ATTRS}
WTFORMS_ATTRS_REVERSED = {v: k for k, v in WTFORMS_ATTRS.items()}
@no_type_check
def converts(*args: str) -> Callable[[T_CC], T_CC]:
def _inner(func: T_CC) -> T_CC:
func._converter_for = frozenset(args)
return func
return _inner
class ModelConverterBase:
_converters: Dict[str, ConverterCallable] = {}
def __init__(self) -> None:
super().__init__()
self._register_converters()
def _register_converters(self) -> None:
converters = {}
for name in dir(self):
obj = getattr(self, name)
if hasattr(obj, "_converter_for"):
for classname in obj._converter_for:
converters[classname] = obj
self._converters = converters
async def _prepare_kwargs(
self,
prop: MODEL_PROPERTY,
session_maker: sessionmaker,
field_args: Dict[str, Any],
field_widget_args: Dict[str, Any],
form_include_pk: bool,
label: Optional[str] = None,
loader: Optional[QueryAjaxModelLoader] = None,
) -> Optional[Dict[str, Any]]:
if not isinstance(prop, (RelationshipProperty, ColumnProperty)):
return None
kwargs: Union[dict, None]
kwargs = field_args.copy()
widget_args = field_widget_args.copy()
widget_args.setdefault("class", "form-control")
kwargs.setdefault("label", label)
kwargs.setdefault("validators", [])
kwargs.setdefault("filters", [])
kwargs.setdefault("default", None)
kwargs.setdefault("description", prop.doc)
kwargs.setdefault("render_kw", widget_args)
if isinstance(prop, ColumnProperty):
kwargs = self._prepare_column(
prop=prop, kwargs=kwargs, form_include_pk=form_include_pk
)
else:
kwargs = await self._prepare_relationship(
prop=prop, session_maker=session_maker, kwargs=kwargs, loader=loader
)
return kwargs
def _prepare_column(
self, prop: ColumnProperty, form_include_pk: bool, kwargs: dict
) -> Union[dict, None]:
assert len(prop.columns) == 1, "Multiple-column properties not supported"
column = prop.columns[0]
if (column.primary_key or column.foreign_keys) and not form_include_pk:
return None
default = getattr(column, "default", None) or kwargs.get("default")
if default is not None:
# Only actually change default if it has an attribute named
# 'arg' that's callable.
callable_default = getattr(default, "arg", None)
if callable_default is not None:
# ColumnDefault(val).arg can be also a plain value
default = (
callable_default(None)
if callable(callable_default)
else callable_default
)
kwargs["default"] = default
optional_types = (Boolean,)
if column.nullable:
kwargs["validators"].append(validators.Optional())
if (
not column.nullable
and not isinstance(column.type, optional_types)
and not column.default
and not column.server_default
):
kwargs["validators"].append(validators.InputRequired())
return kwargs
async def _prepare_relationship(
self,
prop: RelationshipProperty,
kwargs: dict,
session_maker: sessionmaker,
loader: Optional[QueryAjaxModelLoader] = None,
) -> dict:
nullable = True
for pair in prop.local_remote_pairs:
if not pair[0].nullable:
nullable = False
kwargs["allow_blank"] = nullable
if not loader:
kwargs.setdefault(
"data", await self._prepare_select_options(prop, session_maker)
)
return kwargs
async def _prepare_select_options(
self,
prop: RelationshipProperty,
session_maker: sessionmaker,
) -> List[Tuple[str, Any]]:
target_model = prop.mapper.class_
stmt = select(target_model)
if is_async_session_maker(session_maker):
async with session_maker() as session:
objects = await session.execute(stmt)
return [
(str(self._get_identifier_value(obj)), str(obj))
for obj in objects.scalars().unique().all()
]
else:
with session_maker() as session:
objects = await anyio.to_thread.run_sync(session.execute, stmt)
return [
(str(self._get_identifier_value(obj)), str(obj))
for obj in objects.scalars().unique().all()
]
def get_converter(self, prop: MODEL_PROPERTY) -> ConverterCallable:
if isinstance(prop, RelationshipProperty):
direction = get_direction(prop)
return self._converters[direction]
column = prop.columns[0]
types = inspect.getmro(type(column.type))
# Search by module + name
for col_type in types:
type_string = f"{col_type.__module__}.{col_type.__name__}"
if type_string in self._converters:
return self._converters[type_string]
# Search by name
for col_type in types:
if col_type.__name__ in self._converters:
return self._converters[col_type.__name__]
# Support for custom types like SQLModel which inherit TypeDecorator
if hasattr(col_type, "impl"):
if callable(col_type.impl): # type: ignore
impl = col_type.impl # type: ignore
else:
impl = col_type.impl.__class__ # type: ignore
if impl.__name__ in self._converters:
return self._converters[impl.__name__]
raise NoConverterFound( # pragma: nocover
f"Could not find field converter for column {column.name} ({types[0]!r})."
)
async def convert(
self,
model: type,
prop: MODEL_PROPERTY,
session_maker: sessionmaker,
field_args: Dict[str, Any],
field_widget_args: Dict[str, Any],
form_include_pk: bool,
label: Optional[str] = None,
override: Optional[Type[Field]] = None,
form_ajax_refs: Dict[str, QueryAjaxModelLoader] = {},
) -> Optional[UnboundField]:
loader = form_ajax_refs.get(prop.key)
kwargs = await self._prepare_kwargs(
prop=prop,
session_maker=session_maker,
field_args=field_args,
field_widget_args=field_widget_args,
label=label,
form_include_pk=form_include_pk,
loader=loader,
)
if kwargs is None:
return None
if override is not None:
assert issubclass(override, Field)
return override(**kwargs)
multiple = (
is_relationship(prop)
and prop.direction.name in ("ONETOMANY", "MANYTOMANY")
and prop.uselist
)
if loader:
if multiple:
return AjaxSelectMultipleField(loader, **kwargs)
else:
return AjaxSelectField(loader, **kwargs)
converter = self.get_converter(prop=prop)
return converter(model=model, prop=prop, kwargs=kwargs)
def _get_identifier_value(self, o: Any) -> str:
return str(get_object_identifier(o))
class ModelConverter(ModelConverterBase):
@staticmethod
def _string_common(prop: ColumnProperty) -> List[Validator]:
li = []
column: Column = prop.columns[0]
if isinstance(column.type.length, int) and column.type.length:
li.append(validators.Length(max=column.type.length))
return li
@converts("String", "CHAR") # includes Unicode
def conv_string(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
extra_validators = self._string_common(prop)
kwargs.setdefault("validators", [])
kwargs["validators"].extend(extra_validators)
return StringField(**kwargs)
@converts("Text", "LargeBinary", "Binary") # includes UnicodeText
def conv_text(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
extra_validators = self._string_common(prop)
kwargs["validators"].extend(extra_validators)
return TextAreaField(**kwargs)
@converts("Boolean", "dialects.mssql.base.BIT")
def conv_boolean(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
if not prop.columns[0].nullable:
kwargs.setdefault("render_kw", {})
kwargs["render_kw"]["class"] = "form-check-input"
return BooleanField(**kwargs)
kwargs["allow_blank"] = True
kwargs["choices"] = [(True, "True"), (False, "False")]
kwargs["coerce"] = lambda v: str(v) == "True"
return SelectField(**kwargs)
@converts("Date")
def conv_date(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return DateField(**kwargs)
@converts("Time")
def conv_time(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return TimeField(**kwargs)
@converts("DateTime")
def conv_datetime(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return DateTimeField(**kwargs)
@converts("Enum")
def conv_enum(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
available_choices = [(e, e) for e in prop.columns[0].type.enums]
accepted_values = [choice[0] for choice in available_choices]
if prop.columns[0].nullable:
kwargs["allow_blank"] = True
accepted_values.append(None)
filters = kwargs.get("filters", [])
filters.append(lambda x: x or None)
kwargs["filters"] = filters
kwargs["choices"] = available_choices
kwargs.setdefault("validators", [])
kwargs["validators"].append(validators.AnyOf(accepted_values))
kwargs["coerce"] = lambda v: v.name if isinstance(v, enum.Enum) else str(v)
return SelectField(**kwargs)
@converts("Integer") # includes BigInteger and SmallInteger
def conv_integer(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return IntegerField(**kwargs)
@converts("Numeric") # includes DECIMAL, Float/FLOAT, REAL, and DOUBLE
def conv_decimal(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
# override default decimal places limit, use database defaults instead
kwargs.setdefault("places", None)
return DecimalField(**kwargs)
@converts("JSON", "JSONB")
def conv_json(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return JSONField(**kwargs)
@converts("Interval")
def conv_interval(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs["render_kw"]["placeholder"] = "Like: 1 day 1:25:33.652"
return IntervalField(**kwargs)
@converts(
"sqlalchemy.dialects.postgresql.base.INET",
"sqlalchemy.dialects.postgresql.types.INET",
"sqlalchemy_utils.types.ip_address.IPAddressType",
)
def conv_ip_address(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(validators.IPAddress(ipv4=True, ipv6=True))
return StringField(**kwargs)
@converts(
"sqlalchemy.dialects.postgresql.base.MACADDR",
"sqlalchemy.dialects.postgresql.types.MACADDR",
)
def conv_mac_address(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(validators.MacAddress())
return StringField(**kwargs)
@converts(
"sqlalchemy.dialects.postgresql.base.UUID",
"sqlalchemy.sql.sqltypes.UUID",
"sqlalchemy.sql.sqltypes.Uuid",
"sqlalchemy_utils.types.uuid.UUIDType",
)
def conv_uuid(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(validators.UUID())
return StringField(**kwargs)
@converts(
"sqlalchemy.dialects.postgresql.base.ARRAY", "sqlalchemy.sql.sqltypes.ARRAY"
)
def conv_ARRAY(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return Select2TagsField(**kwargs)
@converts("sqlalchemy_utils.types.email.EmailType")
def conv_email(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(validators.Email())
return StringField(**kwargs)
@converts("sqlalchemy_utils.types.url.URLType")
def conv_url(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(validators.URL())
return StringField(**kwargs)
@converts("sqlalchemy_utils.types.currency.CurrencyType")
def conv_currency(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(CurrencyValidator())
return StringField(**kwargs)
@converts("sqlalchemy_utils.types.timezone.TimezoneType")
def conv_timezone(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(
TimezoneValidator(coerce_function=prop.columns[0].type._coerce)
)
return StringField(**kwargs)
@converts("sqlalchemy_utils.types.phone_number.PhoneNumberType")
def conv_phone_number(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(PhoneNumberValidator())
return StringField(**kwargs)
@converts("sqlalchemy_utils.types.color.ColorType")
def conv_color(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs.setdefault("validators", [])
kwargs["validators"].append(ColorValidator())
return StringField(**kwargs)
@converts("sqlalchemy_utils.types.choice.ChoiceType")
@no_type_check
def convert_choice_type(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
available_choices = []
column = prop.columns[0]
if isinstance(column.type.choices, enum.EnumMeta):
available_choices = [(f.value, f.name) for f in column.type.choices]
else:
available_choices = column.type.choices
accepted_values = [
choice[0] if isinstance(choice, tuple) else choice.value
for choice in available_choices
]
if column.nullable:
kwargs["allow_blank"] = column.nullable
accepted_values.append(None)
filters = kwargs.get("filters", [])
filters.append(lambda x: x or None)
kwargs["filters"] = filters
kwargs["choices"] = available_choices
kwargs["validators"].append(validators.AnyOf(accepted_values))
kwargs["coerce"] = choice_type_coerce_factory(column.type)
return SelectField(**kwargs)
@converts("fastapi_storages.integrations.sqlalchemy.FileType")
def conv_file(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return FileField(**kwargs)
@converts("fastapi_storages.integrations.sqlalchemy.ImageType")
def conv_image(
self, model: type, prop: ColumnProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return FileField(**kwargs)
@converts("ONETOONE")
def conv_one_to_one(
self, model: type, prop: RelationshipProperty, kwargs: Dict[str, Any]
) -> UnboundField:
kwargs["allow_blank"] = True
return QuerySelectField(**kwargs)
@converts("MANYTOONE")
def conv_many_to_one(
self, model: type, prop: RelationshipProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return QuerySelectField(**kwargs)
@converts("MANYTOMANY", "ONETOMANY")
def conv_many_to_many(
self, model: type, prop: RelationshipProperty, kwargs: Dict[str, Any]
) -> UnboundField:
return QuerySelectMultipleField(**kwargs)
async def get_model_form(
model: type,
session_maker: sessionmaker,
only: Optional[Sequence[str]] = None,
exclude: Optional[Sequence[str]] = None,
column_labels: Optional[Dict[str, str]] = None,
form_args: Optional[Dict[str, Dict[str, Any]]] = None,
form_widget_args: Optional[Dict[str, Dict[str, Any]]] = None,
form_class: Type[Form] = Form,
form_overrides: Optional[Dict[str, Type[Field]]] = None,
form_ajax_refs: Optional[Dict[str, QueryAjaxModelLoader]] = None,
form_include_pk: bool = False,
form_converter: Type[ModelConverterBase] = ModelConverter,
) -> Type[Form]:
type_name = model.__name__ + "Form"
converter = form_converter()
mapper = sqlalchemy_inspect(model)
form_args = form_args or {}
form_widget_args = form_widget_args or {}
column_labels = column_labels or {}
form_overrides = form_overrides or {}
form_ajax_refs = form_ajax_refs or {}
attributes = []
names = only or mapper.attrs.keys()
for name in names:
if exclude and name in exclude:
continue
attributes.append((name, mapper.attrs[name]))
field_dict = {}
for name, attr in attributes:
field_args = form_args.get(name, {})
field_args["name"] = name
field_widget_args = form_widget_args.get(name, {})
label = column_labels.get(name, None)
override = form_overrides.get(name, None)
field = await converter.convert(
model=model,
prop=attr,
session_maker=session_maker,
field_args=field_args,
field_widget_args=field_widget_args,
label=label,
override=override,
form_include_pk=form_include_pk,
form_ajax_refs=form_ajax_refs,
)
if field is not None:
field_dict_key = WTFORMS_ATTRS.get(name, name)
field_dict[field_dict_key] = field
return type(type_name, (form_class,), field_dict)