CRM form按field自定义，多选readonly

1、form按field自定义

官方文档上：https://docs.djangoproject.com/zh-hans/2.1/ref/forms/validation/写着可以用字段名

from django import forms

class ContactForm(forms.Form):
    # Everything as before.
    ...

    def clean_recipients(self):
        data = self.cleaned_data['recipients']
        if "fred@example.com" not in data:
            raise forms.ValidationError("You have forgotten about Fred!")

        # Always return a value to use as the new cleaned data, even if
        # this method didn't change it.
        return data
 

 在kind_admin.py文件中Customer类中自定义clean_name函数来判断name不能为空：

    def clean_name(self):
        #获取请求的name值
        　　　name = self.cleaned_data["name"]
        if not name:
            #添加报错信息
            　　　　self.add_error("name"," cannot be null")

在form.py文件中clean_name函数添加到form的clean_field函数中：

            #判断名字不能为空
            #判断admin_class里否有clean_name函数
            if hasattr(admin_class, 'clean_%s'%field_name):
                #获取clean_name函数
                clean_names = getattr(admin_class,"clean_%s"%field_name)
                #把clean_name函数添加到form的clean_field中
                setattr(cls, 'clean_%s'%field_name, clean_names)

2、多选框readonly

在前端中判断表单字段是否在kind_admin.py文件的readonly_fields = ['qq','consultant','tags']中，多选的字段是tags

在后端返回的错误提示可以用

{{form_obj.errors}} 或者

{{filed_form.errors.as_text}}在前端获取

table_objs_change.html文件中：

<div class="col-sm-10">
              {#<input type="email" id="inputEmail3" placeholder="{{filed_form}}">#}

                {% if filed_form.name in admin_class.filter_horizontal%}
                <div class="col-lg-5">
                    {% get_m2m_choose_data admin_class filed_form form_obj as m2m_obj_list%}
                    <select multiple class="filter-select-box" id="id_{{filed_form.name}}_from">
                        {% if filed_form.name in admin_class.readonly_fields%}
                            {% for m2m_obj in m2m_obj_list%}
                                <option value="{{m2m_obj.id}}" disabled>{{m2m_obj}}</option>
                            {% endfor %}
                        {% else %}
                            {% for m2m_obj in m2m_obj_list%}
                                <option ondblclick="MoveElementTo(this,'id_{{ filed_form.name }}_to','id_{{ filed_form.name }}_from')" value="{{m2m_obj.id}}">{{m2m_obj}}</option>
                            {% endfor %}
                        {% endif %}

                    </select>
                </div>
                <div class="col-md-1">
                    箭头
                </div>
                <div class="col-lg-5">
                    {% get_m2m_selected_obj filed_form form_obj as m2m_seleced_list %}
                    <select tag="chosen_list" multiple class="filter-select-box" id="id_{{filed_form.name}}_to" name="{{filed_form.name}}">
                        {% if filed_form.name in admin_class.readonly_fields%}
                            {% for m2m_selected_obj in m2m_seleced_list %}
                                <option value="{{m2m_selected_obj.id}}" disabled>{{m2m_selected_obj}}</option>
                            {% endfor %}
                        {% else %}
                            {% for m2m_selected_obj in m2m_seleced_list %}
                                <option ondblclick="MoveElementTo(this,'id_{{ filed_form.name }}_from','id_{{ filed_form.name }}_to')" value="{{m2m_selected_obj.id}}">{{m2m_selected_obj}}</option>
                            {% endfor %}
                        {% endif %}

                    </select>
                </div>

因为tags是多对多的关系，所以要获取数据库中的数据和请求过来的数据是否相等需要做如下，可以先判断数据库里的值是否有“select_related”属性(多对多专有)

        list_error=[]
        for field in admin_class.readonly_fields:
            #在表单可读在数据库里的数据
            from_db_data = getattr(self.instance,field)
            #判断从数据库中取出的值是多对对的
            if hasattr(from_db_data,"select_related"):
                #获取m2m多对多值的的对象
                m2m_obj = getattr(from_db_data,"select_related")().select_related()
                print("m2m_obj",m2m_obj)
                #获取tags的值并切割出来
                m2m_val = [i[0] for i in m2m_obj.values_list("id")]
                #强转数据为集合为了与下面请求的数据比较
                set_m2m_val = set(m2m_val)
                print("set_m2m_val",set_m2m_val)
                #多对多页面请求的值values值
                set_m2m_vals_from_frontend = set([i.id for i in self.cleaned_data.get(field)])
                print("set_m2m_vals_from_frontend",set_m2m_vals_from_frontend)
                if set_m2m_val != set_m2m_vals_from_frontend:
                    self.add_error(field,"readonly field")
                #这个就不执行下面语句了
                continue