Flask：使用一個表單的多個實體

我的網站允許教師為一項作業創建多個問題。創建作業后，學生可以來為每個問題寫一個答案。

我的問題是每個條目只保存一個答案。例如，作業中有兩個問題。問題 1 的答案是“asdf”，問題 2 的答案是“fdsa”。這兩個答案的內容將被保存為“asdf”，當它們應該是唯一的時。

我試過列印request.form，它看起來像這樣（不包括 csrf_tokens）：
('code_content', 'asdf'), ('code_content', 'fdsa'), ('submit', 'Submit Assignment')]
所以我知道 fdsa 仍然在某個地方，但我無法訪問它。如果這很重要，那么列印 request.form 時有兩個完全相同的 csrf_token。

為了獲得這些資料，我為作業中的盡可能多的問題創建了一個“GetQuestionContent()”表單。像這樣：

    questions = []
    question_content_forms = []
    for question in Question.query.all():
        if int(question.owner) == int(assignment_id):
            questions.append(question)

    question_content_forms = [GetQuestionContent() for item in range(0, len(questions))]

然后，在 HTML 中，我這樣撰寫表單：

<form method="POST">
{% for question in questions %}
    <div class="accordion-item">
        <h2 class="accordion-header" id="heading{{ question.id }}">
            <button class="accordion-button collapsed" 
             type="button" 
             data-bs-toggle="collapse" 
             data-bs-target="#collapse{{ question.id }}" 
             aria-expanded="false" 
             aria-controls="collapse{{ question.id }}">
                 {{ question.title }}
             </button>
        </h2>
        <div id="collapse{{ question.id }}" 
        class="accordion-collapse collapse" 
        aria-labelledby="heading{{ question.id }}" 
        data-bs-parent="#questionsAccordion">
            <p>
                <small>
                    <strong>Question Description</strong>
                    <br>
                    {% if question.description != "" %}
                    {{ question.description|safe }}
                    {% else %}
                    <em>The assignment creator did not provide a description for this question.</em>
                    {% endif %}
                </small>
            </p>
            {{ question_content_forms[loop.index - 1].hidden_tag() }}
            {% if question.type == "code" %}
                <div class="code-box">
                    {{ question_content_forms[loop.index - 1].code_content(id = "editor") }}
                </div>
            {% endif %}
            {% if question.type == "text" %}
                {{ question_content_forms[loop.index - 1].text_content|safe }}
            {% endif %}                             
        </div>
    </div>
{% endfor %}
{% if current_user.account_type == "Student" %}
    {{ submit_button.submit(class="btn btn-outline-success mt-3", value="Submit Assignment")}}
{% endif %}
</form>

當用戶按下提交時，我想得到每個答案并將其放入我資料庫中 StudentQuestionSubmission 表的自己的條目中。這就是該代碼的樣子：

if request.method == "POST" and submit_button.data:
    print(request.form)
    index = 0
    for question in questions:
        question_to_submit = StudentQuestionSubmission(question_id = int(question.id),
                                                       student_id = int(current_user.id))
        if question.type == "code":
            question_to_submit.question_content = question_content_forms[index].code_content.data
        elif question.type == "text":
            question_to_submit.question_content = question_content_forms[index].text_content.data

        print(f"\n\n{ question_content_forms[index].code_content.data } \n \
        { question_content_forms[index].text_content.data } \n\n")
        index  = 1
        db.session.add(question_to_submit)

    assignment_to_submit = StudentAssignmentSubmission(assignment_id = int(assignment_id),
                                                        student_id = int(current_user.id),
                                                        has_submitted = True,                                                    
                                                        submission_date = date.today())
    db.session.add(assignment_to_submit)
    db.session.commit()

    flash(f"'{assignment.name}' has been succesfully submitted.")
    return redirect(url_for('classroom_assignments_list', class_id = class_id, paper_id = paper_id))

你可以看到我列印了文本框的資料。即使我為問題 2 寫了完全不同的東西，它也會在兩次迭代中輸出“asdf”。

我很感激任何幫助。謝謝你。

編輯：“hackily”從同一表單的多個實體中獲取內容request.form.to_dict(flat=False)['your_form_field']

這是新代碼：

if request.method == "POST" and submit_button.data:
    code_content = request.form.to_dict(flat=False)['code_content']
    text_content = request.form.to_dict(flat=False)['text_content']
    code_content_index = 0
    text_content_index = 0
    for question in questions:
        question_to_submit = StudentQuestionSubmission(question_id = int(question.id),
                                                       student_id = int(current_user.id))
        if question.type == "code":
            question_to_submit.question_content = code_content[code_content_index]
            code_content_index  = 1
        elif question.type == "text":
            question_to_submit.question_content = text_content[text_content_index]
            text_content_index  = 1

        print(f"\n\n{ question_to_submit.question_content } \n\n")
        db.session.add(question_to_submit)

    assignment_to_submit = StudentAssignmentSubmission(assignment_id = int(assignment_id),
                                                        student_id = int(current_user.id),
                                                        has_submitted = True,                                                    
                                                        submission_date = date.today())
    db.session.add(assignment_to_submit)
    db.session.commit()

    flash(f"'{assignment.name}' has been succesfully submitted.")
    return redirect(url_for('classroom_assignments_list', class_id = class_id, paper_id = paper_id))

uj5u.com熱心網友回復：

我的建議不是創建多個表單，而是為所有必要的問題動態創建一個表單。在這種情況下，可以為每個欄位分配一個唯一的 id，這表明它屬于問題。

以下示例向您展示了一種可能的實作方式。
每個問題都會在表單中添加一個答案欄位，其名稱中包含問題的 ID。因此，可以在渲染和查詢輸入資料時分配相應的問題。

燒瓶

from flask import (
    Flask,
    render_template,
    request
)
from flask_sqlalchemy import SQLAlchemy
from flask_wtf import FlaskForm
from wtforms import TextAreaField, SubmitField
from wtforms.validators import DataRequired
import random

app = Flask(__name__)
app.secret_key = 'your secret here'

db = SQLAlchemy(app)

class Question(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    type = db.Column(db.String)
    owner = db.Column(db.Integer)
    title = db.Column(db.String)
    description = db.Column(db.Text)

with app.app_context():
    db.drop_all()
    db.create_all()

    qs = [Question(
        type=random.choice(['code', 'text']),
        owner=1,
        title=f'Question {i 1}',
        description=f'Your description here.'
    ) for i in range(3)]
    db.session.add_all(qs)
    db.session.commit()

def form_factory(qs):
    class F(FlaskForm):
        submit = SubmitField('Submit')
    for q in qs:
        field = TextAreaField(
            q.type.title(),
            validators=[
                 # DataRequired()
            ],
        )
        setattr(F, f'q-{q.id}', field)
    return F

@app.route('/', methods=['GET', 'POST'])
def index():
    questions = Question.query.filter_by(owner=1).all()
    form = form_factory(questions)(request.form)
    if form.validate_on_submit():
        for q in questions:
            field = getattr(form, f'q-{q.id}')
            print(f'Question-{q.id}\n{field.data}\n')
    
    return render_template('index.html', **locals())

HTML (模板/index.html)

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Index</title>
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-0evHe/X R7YkIZDRvuzKMRqM OrBnVFBL6DOitfPri4tjfHxaWutUpFmBp4vmVor" crossorigin="anonymous">
  </head>
  <body>

    <div class="container my-3">
      <form method="post">
        {{ form.hidden_tag() }}

        <div class="accordion mb-3" id="accordionExample">
        {% for q in questions -%}
        <div class="accordion-item">
          <h2 class="accordion-header" id="heading-{{loop.index}}">
            <button
              class="accordion-button collapsed"
              type="button"
              data-bs-toggle="collapse"
              data-bs-target="#collapse-{{loop.index}}"
              aria-expanded="false"
              aria-controls="collapse-{{loop.index}}"
            >
              {{ q.title }}
            </button>
          </h2>
          <div
            id="collapse-{{loop.index}}"
            class="accordion-collapse collapse"
            aria-labelledby="heading-{{loop.index}}"
            data-bs-parent="#accordionExample"
          >
            <div class="accordion-body">
              <div class="mb-3">
                {{ q.description|safe }}
              </div>
              {% set field = form|attr('q-{}'.format(q.id)) -%}
              <div>
                {{ field.label(class_='form-label') }}
                {{ field(class_='form-control'   ('', ' editor')[q.type=='code']) }}
              </div>
            </div>
          </div>
        </div>
        {% endfor -%}
        </div>

        <div class="d-grid gap-2">
          {{ form.submit(class_='btn btn-primary') }}
        </div>
      </form>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-pprn3073KE6tl6bjs2QrFaJGz5/SUsLqktiwsUTF55Jfv3qYSDhgCecCxMW52nD2" crossorigin="anonymous"></script>

  </body>
</html>

標籤：Python 列表 烧瓶 wtforms

上一篇：有沒有辦法在不更改代碼或檔案的情況下重新加載燒瓶應用程式？[復制]

下一篇：將資料從Flask/Python加載到HTMLtextarea