# 增刪改查
# 前端提交數據的方式:
#     ajax|form表單
#     前端數據校驗,為了減小服務器不必要的壓力;
#     後端驗證是為了保證後端數據的準確性;

# 因為表格中數據都是在後端simple_tag生成的,所以需要在simple_tag循環代碼中,
# 將下標為0的字段值上加上鏈接,點擊可以跳轉至內容修改頁面;
    # kingadmin_tags.py
        @register.simple_tag
        def build_table_row(obj,admin_class):
            ele = ""
            if
 
 admin_class.list_display:
                for index,column_name in enumerate(admin_class.list_display):
                    column_obj = admin_class.model._meta.get_field(column_name)
                    if column_obj.choices: #get_xxx_display
                        column_data = getattr(obj,‘get_%s_display
 
‘% column_name)()
                    else:
                        column_data = getattr(obj,column_name)
                    td_ele = "<td>%s</td>"% column_data
                    # 如果index為0時,為該字段值添加上鏈接
                    if index == 0:
                        td_ele = "<td><a href=‘%s/change/‘></a>%s</td>
 
"% (obj.id,column_data)
                    ele += td_ele
            else:
                td_ele = "<td><a href=‘%s/change/‘>%s</a></td>"% (obj.id,obj)
                ele += td_ele
            return mark_safe(ele)
    # 配置鏈接的urlconf
    # urls.py
        url(r‘^/(\w+)/(\w+)/(\d+)/change/$‘, views.table_obj_change, name="table_obj_change"),
    # views.py
        @login_required
        def table_obj_change(request,app_name,model_name,obj_id):
            """數據修改頁面"""
            return render(request, ‘kingadmin/table_obj_change.html‘)
    # table_obj_change.html
        {% extends ‘kingadmin/index.html‘ %}
        {% load kingadmin_tag %}
        {% block right_content %}
            The content for urself!
            <div>
                修改頁面！
            </div>

        {% endblock right_content %}

# 靜態model_form回顧
    # forms.py
        class CustomerForm(ModelForm):
            class Meta:
                model = models.CustomerInfo
                fields = ‘__all__‘  #[‘name‘,‘consultant‘,‘status‘]
    # views.py
        @login_required
        def table_obj_change(request,app_name,model_name,obj_id):
            """數據修改頁面"""
            from crm import forms
            form = forms.CustomerForm()
            return render(request, ‘kingadmin/table_obj_change.html‘,locals())
    # form數據就在頁面中顯示,但是所有表頁面顯示這一個modelform指定的表字段;
    # 難道每個表都寫一個modelform?
    # 怎麽做成動態modelform?django裏沒有動態modelform的概念;

# 動態生成類？
# 創建類的另一種方式
    def func(self): # 記得加self
        print(‘hello world‘)
    Foo = type(‘Foo‘,(object,),{‘func‘:func})
    # 參數1:類名;
    # 參數2:當前類的基類;
    # 參數3:類的成員;

# 實現動態生成指定表的所有表結構modelform
    # form_handle.py
        # class CustomerForm(ModelForm):
            # """展示所有表結構"""
            # class Meta:
                # model = models.CustomerInfo
                # fields = ‘__all__‘  #[‘name‘,‘consultant‘,‘status‘]

        def create_dynamic_modelform(admin_class):
            """動態生成modelform"""
            class Meta:
                model = admin_class.model
                fields = "__all__"
            dynamic_form = type("DynamicModelForm",(ModelForm,),{‘Meta‘:Meta})
            print(dynamic_form)
            # >> <class ‘django.forms.widgets.DynamicModelForm‘>
            return dynamic_form # 返回類,來實例化
    # veiws.py
        @login_required
        def table_obj_change(request,app_name,model_name,obj_id):
            """數據修改頁面"""
            # 1.動態創建modelform類
            admin_class = site.enabled_admins[app_name][model_name]
            modelform = form_handle.create_dynamic_modelform(admin_class)
            # 2.實現modelform,展示表結構
            form_obj = modelform()
            return render(request, ‘kingadmin/table_obj_change.html‘,locals())

# modelform添加自定義樣式
    # <div class="form-group">
        # <label for="inputEmail3" class="col-sm-2 control-label">Email</label>
        # <div class="col-sm-10">
            # <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
        # </div>
    # </div>

    # table_obj_change.html
        <form class="form-horizontal">
            {% for field in form_obj %}
            <div class="form-group">
                <label for="inputEmail3" class="col-sm-2 control-label">{{ field.label }}</label>
                <div class="col-sm-10">
                    {{ field }}
                </div>
            </div>
            {% endfor %}
        </form>
        # {{field.label}} 自動生成了input樣式,怎麽修改?
    # 修改modelform樣式
        # form_handle.py
            def create_dynamic_modelform(admin_class):
                """動態生成modelform"""
                class Meta:
                    model = admin_class.model
                    fields = "__all__"

                def __new__(cls,*args,**kwargs):
                    print("__new__",cls,args,kwargs)
                    for field_name in cls.base_fields:
                        field_obj = cls.base_fields[field_name]
                        field_obj.widget.attrs.update({‘class‘:‘form-control‘})
                    return ModelForm.__new__(cls)
                dynamic_form = type("DynamicModelForm",(ModelForm,),{‘Meta‘:Meta,‘__new__‘:__new__})
                print(dynamic_form)
                return dynamic_form

# 任意表的增刪改查
# 1.修改
#     1.1 展示當前修改表與記錄
        # table_obj_change.html
            <nav class="navbar navbar-default navbar-static-top">
                <div class="container">
                    <!-- 1.獲取當前表名 -->
                    <h1>{% get_model_name admin_class %}</h1>
                    <!-- 2.顯示當前修改哪條記錄 -->
                    當前記錄:{{ form_obj.instance }}
                </div>
            </nav>
        # views.py
            @login_required
            def table_obj_change(request,app_name,model_name,obj_id):
                """數據修改頁面"""
                # 1.動態創建modelform類
                admin_class = site.enabled_admins[app_name][model_name]
                modelform = form_handle.create_dynamic_modelform(admin_class)
                # 2.實現modelform,展示表結構
                #   2.1 展示沒有數據的modelform
                # form_obj = modelform()
                #   2.2 展示當前數據的modelform
                # 獲取當前記錄對象
                obj = admin_class.model.objects.get(id=obj_id)
                form_obj = modelform(instance=obj)

                return render(request, ‘kingadmin/table_obj_change.html‘,locals())
        # 提交修改後的表單model_form
            <div class="form-group">
                <div class="col-sm-offset-2 col-sm-10">
                    <button type="submit" class="btn btn-default">Sign in</button>
                </div>
            </div>
#      1.2 提交以及保存修改後的數據
        # views.py
            @login_required
            def table_obj_change(request,app_name,model_name,obj_id):
                """數據修改頁面"""
                # 1.動態創建modelform類
                admin_class = site.enabled_admins[app_name][model_name]
                modelform = form_handle.create_dynamic_modelform(admin_class)
                # 2.實現modelform,展示表結構
                #   2.1 展示沒有數據的modelform
                # form_obj = modelform()
                #   2.2 展示當前數據的modelform
                # 獲取當前記錄對象
                obj = admin_class.model.objects.get(id=obj_id)

                # 3.判斷請求條件,如果是POST請求,獲取請求數據,進行數據檢驗,再做保存,驗證不通過,返回錯誤信息;
                if request.method == ‘GET‘:
                    form_obj = modelform(instance=obj)
                elif request.method == ‘POST‘:
                    form_obj = modelform(instance=obj,data=request.POST)
                    if form_obj.is_valid():
                        form_obj.save()
                        return redirect(‘/kingadmin/%s/%s‘%(app_name,model_name))

                return render(request, ‘kingadmin/table_obj_change.html‘,locals())
        # table_obj_change.html
            <form class="form-horizontal" method="POST">
                {% csrf_token %}
                <!-- modelform全局錯誤信息 -->
                {# {{ form_obj.errors }}#}
                {% for field in form_obj %}
                <div class="form-group">
                    <label for="inputEmail3" class="col-sm-2 control-label">{{ field.label }}</label>
                    <div class="col-sm-10">
                        {{ field }}
                        <!-- 單字段錯誤信息 -->
                        <span style="color:red">{{ field.errors.0 }}</span>
                    </div>
                </div>
                {% endfor %}
                <div class="form-group">
                    <div class="col-sm-offset-11 col-sm-10">
                        <button type="submit" class="btn btn-default">SAVE</button>
                    </div>
                </div>
            </form>
    
# 2.增加
    # urls.py
        url(r‘^(\w+)/(\w+)/add/$‘, views.table_obj_add, name="table_obj_add"),
    # views.py
        @login_required
        def table_obj_add(request,app_name,model_name):
            """增加記錄"""
            # 1.動態創建modelform類
            admin_class = site.enabled_admins[app_name][model_name]
            modelform = form_handle.create_dynamic_modelform(admin_class)
            if request.method == ‘GET‘:
                form_obj = modelform()
            elif request.method == ‘POST‘:
                form_obj = modelform(data=request.POST)
                if form_obj.is_valid():
                    form_obj.save()
                    return redirect(‘/kingadmin/%s/%s‘ % (app_name, model_name))
            return render(request, ‘kingadmin/table_obj_add.html‘, locals())
    # table_obj_add.html
    #     table_obj_change.html中的表結構就不重復寫了,單獨寫在table_obj_common.html,其它頁面include它;
        # {% include ‘kingadmin/table_obj_common.html‘ %}
        {% extends ‘kingadmin/index.html‘ %}
        {% load kingadmin_tag %}
        {% block right_content %}
            <nav class="navbar navbar-default navbar-static-top">
                <div class="container">
                    <!-- 1.獲取當前表名 -->
                    <h1>{% get_model_name admin_class %}</h1>
                    <!-- 2.顯示當前修改哪條記錄 -->
                    <b>添加</b>
                </div>
            </nav>
            {% include ‘kingadmin/table_obj_common.html‘ %}
        {% endblock right_content %}
    # 問題:不知道有沒添加？
    # 措施:將最新添加的顯示在第一個;
        # views.py
            def table_obj_list(request,app_name,model_name):
                ...
                querysets = admin_class.model.objects.all().order_by(‘-id‘)
                ...
############################################################### 修改與添加功能做完了;

CRM手記-9 | Django