我正在尝试创建一个列出有关实体的所有信息的页面,然后允许用户添加有关实体的注释。我在 Google App Engine 上使用 Flask(使用由 Kamal Gill 编写的样板文件)。
我的问题分为两部分:a)如何查询有关实体的信息,然后使用表单发布信息?b)如何将实体信息传递给表单,以便编辑实体?
这是我所拥有的:
#model.py
class Providers(db.Model):
"""Provider Information DB"""
pAgency = db.StringProperty()
pSite = db.StringProperty()
programName = db.StringProperty()
pNotes = db.TextProperty()
#forms.py
class ProviderForm(wtf.Form):
providerName = wtf.TextField()
providerNote = wtf.TextAreaField('Add notes', validators=[validators.Required()])
在views.py中
def list_addresses(agency):
addrs = []
addresses = db.Query(Providers).filter('pAgency =', agency).order('pAddress')
for addr in addresses:
addrs.append((addr.pAddress, addr.programName))
return addrs
def add_notes(agency):
form = ProviderForm()
if form.validate_on_submit():
notes = ProviderNotes(
pNotes = form.providerNote.data)
try:
notes.put()
return 'Worked'
except:
return redirect(url_for('list_provs'))
return render_template('provider_notes.html', form=form, addrs=list_addresses(agency))
网址规则:
# Add notes
app.add_url_rule('/providers/<agency>', 'add_notes', view_func=views.add_notes, methods=['GET', 'POST'])
我现在拥有的 HTML 是这样的:
<ul>
<h1 id="">Provider Information</h1>
{% for address in addrs %}
<p>{{address}}</p>
{% for prog in programs %}
{% if prog != '' %}
<li>{{prog}}</li>
{% endif %}
{% endfor %}
<p> </p>
{% endfor %}
</ul>
<form method="post" action="{{ url_for('list_addresses') }}">
{% for field in form %}
<p>{{ field.label }}</p>
<p>{{ field }}</p>
{% endfor %}
<p>
<button type="submit">Save notes</button>
<a href="{{ url_for('list_provs') }}">Cancel</a>
</p>
</form>
这会导致回溯错误:
Traceback (most recent call last):
File ".../src/packages/flaskext/gae_mini_profiler/profiler.py", line 303, in __call__
result = self.app(environ, start_response)
File ".../src/packages/flask.zip/flask/app.py", line 1506, in wsgi_app
File ".../src/packages/flask.zip/flask/app.py", line 1504, in wsgi_app
File ".../src/packages/flask.zip/flask/app.py", line 1264, in full_dispatch_request
File ".../src/packages/flask.zip/flask/app.py", line 1262, in full_dispatch_request
File ".../src/packages/flask.zip/flask/app.py", line 1248, in dispatch_request
File ".../src/application/views.py", line 55, in add_notes
return render_template('provider_notes.html', form=form, addrs=list_addresses(agency))
File ".../src/packages/flask.zip/flask/templating.py", line 123, in render_template
File ".../src/packages/flask.zip/flask/templating.py", line 107, in _render
File ".../src/packages/jinja2.zip/jinja2/environment.py", line 891, in render
File ".../src/application/templates/provider_notes.html", line 1, in top-level template code
<form method="post" action="{{ url_for('add_notes') }}">
BuildError: ('add_notes', {}, None)
仅当为 add_notes() 提供参数时才会发生此错误。
我是 python 的初学者,所以我可能错过了一些非常明显的东西。我知道该错误源于尝试在 GET 上下文中创建表单,但我不确定如何解决该问题。而且我不知道如何开始解决我的两个大问题。
谢谢,如果我应该进一步澄清一些事情,请告诉我!
编辑:我一直在看这个关于 routing的问题,但并没有真正理解它是否适用于我需要做的事情。