django 外键使用select html

1.HTML代码：

            <td>
                <select id="depend_case" name="depend_case">
                    <option value=""
                            {% if clickandback.depend_case_id == None %}
                                selected="selected"
                            {% endif %}>
                            ---请选择
                    </option>
                    {%for cab in clickandback_all%}
                        <option
                                value={{forloop.counter}}
                                        {% if cab.id == clickandback.depend_case_id%}
                                            selected="selected"
                                        {% endif %}>
                            cab.test_case_title
                            <!--[{{ cab.test_project }}]-[{{ cab.test_module }}]-[{{ cab.test_page }}]_{{cab.test_case_title }}-->
                        </option>
                    {%endfor%}

                </select>

            </td>

2.为外键时，value需要为外键的id,代码如下：

<td>
    <select id="depend_case" name="depend_case">
        <option value=""
                {% if clickandback.depend_case_id == None %}
                    selected="selected"
                {% endif %}>
                ---请选择
        </option>
        {%for cab in clickandback_all%}
            <option
                    value={{cab.id}}
                            {% if cab.id == clickandback.depend_case_id%}
                                selected="selected"
                            {% endif %}>
                [{{ cab.test_project }}]-[{{ cab.test_module }}]-[{{ cab.test_page }}]_{{cab.test_case_title }}]
            </option>
        {%endfor%}

    </select>

</td>