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当我访问 /admin/newpost 时,我希望我的 edit.html 模板能够呈现和显示我的表单字段。相反,我得到一个没有错误的空白页。但是,当我查看源代码时,我看到以下内容。

<Template '/edit.html'>

我没有收到任何错误,因此没有堆栈跟踪。

  • GAE 版本:1.7
  • 视窗 7 64 位
  • jinja2最新版本
  • 蟒蛇2.7

我的代码和模板如下

这是我的代码:

import os
import webapp2
import config
import jinja2


from google.appengine.ext import db

import fix_path
import config
import static
import wtforms
from wtforms.ext.appengine.db import model_form
from wtforms import Form, TextField, validators


def render_template(template_name, template_vals=None, theme=None):
    template_path = os.path.join(os.path.dirname(__file__) , \
            "themes", theme or config.theme)
    env = jinja2.Environment(
        loader=jinja2.FileSystemLoader(template_path))
    return env.get_template(template_name, template_vals or {})


class BlogPost(db.Model):
    #The URL path to the blog post. Posts have a path if they are published.
    path = db.StringProperty()
    title = db.StringProperty(required=True, indexed=False)
    body = db.TextProperty(required=True)
    published = db.DateTimeProperty(auto_now_add=True)
    updated = db.DateTimeProperty(auto_now=True)

    def render(self):
        template_vals = {
            'config': config,
            'post': self,
        }
        return render_template("post.html", template_vals)

form = model_form(BlogPost, Form)

class PostForm(form):
    pass

class PostHandler(webapp2.RequestHandler):

    @webapp2.cached_property
    def jinja2(self):
        return jinja2.get_jinja2(app=self.app)

    def render_to_response(
        self,
        template_name,
        template_vals=None,
        theme=None
        ):
        template_name = "admin/%s" % template_name
        self.response.out.write(render_template(
            template_name, template_vals, theme))

    def render_form(self, form):
        self.render_to_response("edit.html", {'form': form})

    def get(self):
        self.render_form(PostForm())

app = webapp2.WSGIApplication([('/admin/newpost', PostHandler)],
                              debug=True)

这是我的模板:

{% extends "base.html" %}
{% block title %}Testing New Post Template{% endblock %}
{% block body %}
  <form method="post" action="">
    <table>

<div>{{ form.title.label }}: {{ form.title(class="css_class") }}</div>
{% if form.title.errors %}
        <ul class="errors">{% for error in form.name.errors %}<li>{{ error }}</li>{% endfor %}</ul>
    {% endif %}

<div>{{ form.body.label }}: {{ form.body() }}</div>
{% if form.body.errors %}
        <ul class="errors">{% for error in form.body.errors %}<li>{{ error }}</li>{% endfor %}</ul>
    {% endif %}

    </table>
    <input type="submit" />
  </form>
{% endblock %}

我的 app.yaml 文件

application: cmwo-blog
version: 1
runtime: python27
api_version: 1
threadsafe: no

handlers:

- url: /admin/.*
  script: admin.app
  login: admin

- url: /favicon\.ico
  static_files: favicon.ico
  upload: favicon\.ico

- url: /static/([^/]+)/(.*)
  static_files: themes/\1/static/\2
  upload: themes/[^/]+/static/.*

- url: .*
  script: static.app

builtins:
- remote_api: on

libraries:
- name: webapp2
  version: "2.5.1"

- name: jinja2
  version: latest
4

1 回答 1

2

我不使用 Jinja,但您的render_template方法似乎并没有真正呈现模板。它调用env.get_template,它可能会获取一个模板对象,但随后需要调用一些东西来实际呈现该模板 - 快速查看文档,您应该这样做:

template = env.get_template(template_name)
return template.render(**(template_vals or {}))
于 2012-07-29T15:37:12.900 回答