Can't iterate over GqlQuery object - google-app-engine

Question

I have a Blog model which contains 4 entities, subject, blog, time_created and day_created. I query all the values and assign it to an object which pass to a jinja2 template. In the template I iterate over the object and print each different entity which results in the display of each blog post.
The model for the data is:
class Blog(db.Model):
subject = db.StringProperty(required = True, multiline = True)
blog = db.TextProperty(required = True)
time_created = db.DateTimeProperty(auto_now_add = True)
day_created = db.DateProperty(auto_now_add = True)
And I query all the entries to display as individual posts as such:
posts = db.GqlQuery('SELECT * FROM Blog ORDER BY time_created DESC')
and I pass these out to the template
class Mainpage(BaseHandler):
def get(self):
posts = Blog_posts()
logging.info(posts)
if posts:
end_time = time.time() - start_time
logging.info(end_time)
logging.info(start_time)
userLogin = self.checkLogin()
cookieVal = self.read_secure_cookie('user-id')
if cookieVal:
u_id = cookieVal.split('|')[0]
usr_instance = Users.get_by_id(int(u_id))
if usr_instance:
name = usr_instance.username
if userLogin == True and name:
self.render("blog.html", posts = posts, userLogin = userLogin, user_name = name, end_time = int(end_time))
logging.info("Logged in = " + str(userLogin))
else:
self.render("blog.html", posts = posts, userLogin = userLogin, user_name = "", end_time = int(end_time))
else:
self.render("blog.html", posts = posts, userLogin = userLogin, user_name = "", end_time = int(end_time))
the function render() is :
def render(self, template, **kw):
self.response.out.write(render_str(template, **kw))
I have a main template blogbase.html which I inherit to all other pages and it contains these lines which I use for template inheritance :
<div class="content">
{% block content %}
{% endblock %}
</div>
and in the html file that displays the main blog page and inherits this is :
{% extends "blogbase.html" %}
{% block content %}
{% for post in posts %}
<div class="one_post">
<div class="subject_title">
<div class="day">{{post.day_created.strftime("%d %b %Y")}}</div>
<a href="/blog/{{post.key().id()}}" target="_blank">
{{post.subject}}
</a>
</div>
<div class="post">
{{post.blog}}
</div>
</div>
{% endfor %}
<div class="query">
Queried {{end_time}} seconds ago
</div>
{% endblock %}
I added a debugging line to see whether the query works and it returns the true with the following :
<google.appengine.ext.db.GqlQuery object at 0x7f99f03cd050>
But I am not able to iterate over this object as in the templates, regular html works, but the part between the for loop doesn't render.
Is there something wrong in my query ? Or am I using the templating engine wrong ?

Answer 1

2 things I've noticed.
You are using a query in your templates to iterate over it and do what? Print info? You need to get the entities. Either get them when you query or iterate and fetch.
posts = db.GqlQuery('SELECT * FROM Blog ORDER BY time_created DESC').fetch(1000)
Also if you are passing dicts to jinja you might wanny check that you are using {% for post in posts.iteritems() %} but this is not the case here.