每个文章页面都有一个表单,供登录用户添加评论。我希望用户即使尚未登录也能够发表评论。应将它们重定向到登录页面,然后添加注释。但是,当Flask-Login的login_required重定向重定向回页面时,它不是POST请求,并且不会保留表单数据。登录并重定向后,是否可以保留POST数据?
Flask-Login
login_required
@articles.route('/articles/<article_id>/', methods=['GET', 'POST']) def article_get(article_id): form = CommentForm(article_id=article_id) if request.method == 'POST': if form.validate_on_submit(): if current_user.is_authenticated(): return _create_comment(form, article_id) else: return app.login_manager.unauthorized() r = requests.get('%s/articles/%s/' % (app.config['BASE'], article_id)) article = r.json()['article'] comments = r.json()['comments'] article['time_created'] = datetime.strptime(article['time_created'], '%a, %d %b %Y %H:%M:%S %Z') for comment in comments: comment['time_created'] = datetime.strptime(comment['time_created'], '%a, %d %b %Y %H:%M:%S %Z') return render_template('articles/article_item.html', article=article, comments=comments, form=form) def _create_comment(form, article_id): headers = {'Content-type': 'application/json', 'Accept': 'text/plain'} data = {'body': form.body.data, 'article_id': article_id, 'user_id': current_user.id} r = requests.post('%s/articles/comment/' % app.config['BASE'], data=json.dumps(data), headers=headers) return redirect(url_for('.article_get', article_id=article_id, _anchor='comment-set'))
由于必须登录后才能发布用户,因此如果用户未登录,则仅显示“单击此处登录”链接而不是表单是更有意义的。
如果确实要执行此操作,则可以在重定向到登录路径时在会话中存储任何表单数据,然后在返回注释路径时检查此存储的数据。同时存储请求的路径,以便仅当你返回同一页面时才可以恢复数据。要存储数据,你需要创建自己的login_required装饰器。
request.form.to_dict(flat=False)会将MultiDict数据转储到列表的字典中。这可以存储在中session。
request.form.to_dict(flat=False)
MultiDict
from functools import wraps from flask import current_app, request, session, redirect, render_template from flask_login import current_user from werkzeug.datastructures import MultiDict def login_required_save_post(f): @wraps(f) def decorated(*args, **kwargs): if current_app.login_manager._login_disabled or current_user.is_authenticated: # auth disabled or already logged in return f(*args, **kwargs) # store data before handling login session['form_data'] = request.form.to_dict(flat=False) session['form_path'] = request.path return current_app.login_manager.unauthorized() return decorated @app.route('/article/<int:id>', methods=['GET', 'POST']) @login_required_save_post def article_detail(id): article = Article.query.get_or_404(id) if session.pop('form_path', None) == request.path: # create form with stored data form = CommentForm(MultiDict(session.pop('form_data'))) else: # create form normally form = CommentForm() # can't validate_on_submit, since this might be on a redirect # so just validate no matter what if form.validate(): # add comment to article return redirect(request.path)