我相信 modelform 知道如何使用模型字段验证器。我正在创建一个动态表单,我需要复制此行为,这样我就不会违反 DRY。我在哪里连接这两个?
最佳答案
django/forms/forms.py
is_valid
表单方法正在从表单 _get_errors
调用表单 full_clean
方法(self.errors=property(_get_errors)
):
return self.is_bound and not bool(self.errors)
full_clean
调用以下函数序列:
self._clean_fields()
self._clean_form()
self._post_clean()
我认为这是您正在寻找的功能:
def _post_clean(self):
"""
An internal hook for performing additional cleaning after form cleaning
is complete. Used for model validation in model forms.
"""
pass
django/forms/models.py
def _post_clean(self):
opts = self._meta
# Update the model instance with self.cleaned_data.
self.instance = construct_instance(self, self.instance, opts.fields, opts.exclude)
exclude = self._get_validation_exclusions()
# Foreign Keys being used to represent inline relationships
# are excluded from basic field value validation. This is for two
# reasons: firstly, the value may not be supplied (#12507; the
# case of providing new values to the admin); secondly the
# object being referred to may not yet fully exist (#12749).
# However, these fields *must* be included in uniqueness checks,
# so this can't be part of _get_validation_exclusions().
for f_name, field in self.fields.items():
if isinstance(field, InlineForeignKeyField):
exclude.append(f_name)
# Clean the model instance's fields.
try:
self.instance.clean_fields(exclude=exclude)
except ValidationError, e:
self._update_errors(e.message_dict)
# Call the model instance's clean method.
try:
self.instance.clean()
except ValidationError, e:
self._update_errors({NON_FIELD_ERRORS: e.messages})
# Validate uniqueness if needed.
if self._validate_unique:
self.validate_unique()
因此,模型表单验证与简单表单验证的不同之处在于,模型表单验证对模型 instance._clean_fields(exclude=exclude)
(某些字段从验证中排除)和 instance.clean() 执行额外的调用
.
关于django - 如何手动将模型字段验证器连接到表单字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14865680/