我可以使用 WTForms 和 Flask 向数据库添加新条目，并且也可以进行编辑，问题是我需要以编辑表单显示数据库中已存在的信息。
我有以下代码：
编辑帖子表单的类
class editPostForm(Form):
postTitle = TextField('postTitle', validators.Required()])
postSubtitle = TextField('postSubtitle', validators.Required()])
编辑帖子模板的路线
@app.route('/editpost/<postId>', methods = ['GET','POST'])
def editpost_page(postId):
try:
form = editPostForm(form)
if request.method == "POST" and form.validate():
postTitle = form.postTitle.data
postSubtitle = form.postSubtitle.data
c, conn = connection()
query = c.execute("SELECT * FROM posts WHERE post_id = (%s)",
[noinjection(postId)])
c.execute("UPDATE posts SET post_title=%s, post_subtitle=%s WHERE post_id = %s",
[
noinjection(postTitle),
noinjection(postSubtitle),
noinjection(postId)
])
conn.commit()
flash("Post Edited", 'success')
c.close()
conn.close()
gc.collect()
return redirect(url_for('posts'))
return render_template("editpost.html", form = form, POST_ID = postId)
except Exception as e:
return(str(e))
编辑帖子模板 {jinja}
{% extends "header.html" %}
{% block body %}
<body>
<div class="container-fluid">
<br />
<h4>Edit Post</h4>
<br />
{% from "_formhelpers.html" import render_field %}
<form action="/editpost/{{ POST_ID }}" class="form-horizontal" method="post">
{% from "_formhelpers.html" import render_field %}
<form action="/editpost/" method="post">
<div class="form-group">
<label for="postTitle">Post Title</label>
<input type="text" class="form-control" id="postTitle" name="postTitle" placeholder="Post Title" value="{{request.form.postTitle}}">
</div>
<div class="form-group">
<label for="postSubtitle">Post Subtitle</label>
<input type="text" class="form-control" id="postSubtitle" name="postSubtitle" placeholder="Post Subtitle" value="{{request.form.postSubtitle}}">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
{% if error %}
<p class="error"><strong>Error: </strong>{{error}}</p>
{% endif %}
</form>
{% if error %}
<p class="error"><strong>Error: </strong>{{error}}</p>
{% endif %}
</div>
</body>
{% endblock %}
使用以下代码，我将在数据库中获取要更新的选定帖子，但 editpost 模板未显示数据库中已有的值，并且所有字段均为空白。
如何在编辑之前预先填充表单？
