CRM项目实战-动态model form 增加自定义样式

类在实例化之前会执行__new__方法

cls.base_fields ——》form字段　　 admin_class.model._meta.fields——》model字段

 

from django.forms import ModelForm


def create_dynamic_model_form(admin_class,form_add=False):
    """动态的生成modelform
    form_add: False 默认是修改的表单,True时为添加
    """

    class Meta:
        model = admin_class.model
        # fields = ['name','consultant','status']
        fields = "__all__"
        if not form_add:#change
            exclude = admin_class.readonly_fields
            admin_class.form_add = False #这是因为自始至终admin_class实例都是同一个,
            # 这里修改属性为True是为了避免上一次添加调用将其改为了True
        else: #add
            admin_class.form_add = True

    def __new__(cls, *args, **kwargs):
        print("__new__",cls,args,kwargs)
        for field_name in cls.base_fields:  #admin_class.model._meta.fields?
            print('123',cls.base_fields)
            print('456',admin_class.model._meta.fields)
            filed_obj = cls.base_fields[field_name]
            filed_obj.widget.attrs.update({'class':'form-control'})
            # if field_name in admin_class.readonly_fields:
            #     filed_obj.widget.attrs.update({'disabled': 'true'})
            #     print("--new meta:",cls.Meta)

        #print(cls.Meta.exclude)
        return  ModelForm.__new__(cls)

    dynamic_form = type("DynamicModelForm" ,(ModelForm,) ,{'Meta' :Meta,'__new__':__new__})

    print(dynamic_form)
    return dynamic_form