(mcs, name, bases, attrs)
| 273 | |
| 274 | class ModelFormMetaclass(DeclarativeFieldsMetaclass): |
| 275 | def __new__(mcs, name, bases, attrs): |
| 276 | new_class = super().__new__(mcs, name, bases, attrs) |
| 277 | |
| 278 | if bases == (BaseModelForm,): |
| 279 | return new_class |
| 280 | |
| 281 | opts = new_class._meta = ModelFormOptions(getattr(new_class, "Meta", None)) |
| 282 | |
| 283 | # We check if a string was passed to `fields` or `exclude`, |
| 284 | # which is likely to be a mistake where the user typed ('foo') instead |
| 285 | # of ('foo',) |
| 286 | for opt in ["fields", "exclude", "localized_fields"]: |
| 287 | value = getattr(opts, opt) |
| 288 | if isinstance(value, str) and value != ALL_FIELDS: |
| 289 | msg = ( |
| 290 | "%(model)s.Meta.%(opt)s cannot be a string. " |
| 291 | "Did you mean to type: ('%(value)s',)?" |
| 292 | % { |
| 293 | "model": new_class.__name__, |
| 294 | "opt": opt, |
| 295 | "value": value, |
| 296 | } |
| 297 | ) |
| 298 | raise TypeError(msg) |
| 299 | |
| 300 | if opts.model: |
| 301 | # If a model is defined, extract form fields from it. |
| 302 | if opts.fields is None and opts.exclude is None: |
| 303 | raise ImproperlyConfigured( |
| 304 | "Creating a ModelForm without either the 'fields' attribute " |
| 305 | "or the 'exclude' attribute is prohibited; form %s " |
| 306 | "needs updating." % name |
| 307 | ) |
| 308 | |
| 309 | if opts.fields == ALL_FIELDS: |
| 310 | # Sentinel for fields_for_model to indicate "get the list of |
| 311 | # fields from the model" |
| 312 | opts.fields = None |
| 313 | |
| 314 | fields = fields_for_model( |
| 315 | opts.model, |
| 316 | opts.fields, |
| 317 | opts.exclude, |
| 318 | opts.widgets, |
| 319 | opts.formfield_callback, |
| 320 | opts.localized_fields, |
| 321 | opts.labels, |
| 322 | opts.help_texts, |
| 323 | opts.error_messages, |
| 324 | opts.field_classes, |
| 325 | # limit_choices_to will be applied during ModelForm.__init__(). |
| 326 | apply_limit_choices_to=False, |
| 327 | form_declared_fields=new_class.declared_fields, |
| 328 | ) |
| 329 | |
| 330 | # make sure opts.fields doesn't specify an invalid field |
| 331 | none_model_fields = {k for k, v in fields.items() if not v} |
| 332 | missing_fields = none_model_fields.difference(new_class.declared_fields) |
nothing calls this directly
no test coverage detected