Include snippets in template that have view-like logic - flask

Question

I am building a blog with flask-flatpages. In the header of a markdown blogpost, I list the related blogpostings by filename. These should show up as excerpts below the actual blogposting.
Here is what blogpost-1.md should look like:
title: "Blogpost one"
published: 2014-02-13
related:
- blogpost-2.md
- blogpost-4.md
description: "This is the excerpt of blogpost one."
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer
vel leo turpis. Cras vulputate mattis dignissim. Aliquam eget
purus purus.
And the result I want:
BLOGPOST ONE
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer vel
leo turpis. Cras vulputate mattis dignissim. Aliquam eget purus purus.
related posts:
BLOGPOST TWO
Summary here
BLOGPOST THREE
Also a summary
The essential part is to follow the path of the related blogpostings and render their title and excepts. Naively something like:
{% for item in blog.meta.related %}
<div>
<h4>{{ item.title }}</h4>
<p>{{ item.decription</p>
</div>
{% endfor %}
This is obviously not going to work, because meta.related is simply a list of strings. It is also not difficult to make a view function that takes these strings and returns a httpResponse:
# app.py
#app.route('/excerpt/<path:path>.html')
def excerpt(path):
blog = blogs.get_or_404(path)
return render_template('excerpt.html', blog=blog)
# excerpt.html
<div>
<h4>{{ blog.meta.title }}</h4>
<p>{{ blog.meta.description }}</p>
</div>
My question: how do I make this happen within the same template?
Should I somehow try to pass the data from the related blogpostings into the context: a list of dicts maybe? Should I use a context processor to achieve this?

Answer 1

Hei Roy, thanks for you research but for the moment i cannot comment so i have to find a way to clarify this.
In order to make this working, in the markdown file you wrote:
title: "Blogpost one"
published: 2014-02-13
related:
- blogpost-2.md
- blogpost-4.md
description: "This is the excerpt of blogpost one."
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer
vel leo turpis. Cras vulputate mattis dignissim. Aliquam eget
purus purus.
Need to be change blogpost-2.md and blogpost-4.md without the .md extension.
Without these changes when you loop on the view file:
for path in blog.meta['related']:
related_list.append(blogs.get_or_404(path))
blogpost-1/2.md will not be added to your list because Flask-FlatPages will not understand .md extension and 404 error comes up.
In my case
#app.route('/blog/<path:path>.html')
is changed without .html like :
#site.route('/bloging/<path:path>/')
And to simplify some coding, in template
{{ related.meta.title }}
is equivalent to
{{ related.title }}
and you could add the link to your related article with:
{{ related.title }}
where site is my blueprint.

Answer 2

I arrived at a pretty straightforward answer, but keeping the question open to see if there is a more elegant solution.
In the view function, I iterate the paths of the related blog postings and add the blog objects to a list, which gets passed to the template.
Like this:
#app.route('/blog/<path:path>.html')
def blog_detail(path):
blog = blogs.get_or_404(path)
related_list = []
for path in blog.meta['related']:
related_list.append(blogs.get_or_404(path))
return render_template('blog-detail.html', blog=blog, related_list=related_list)
And in the template:
{% for related in related_list %}
hoi
<div>
<h4>{{ related.meta.title }}</h4>
<p>{{ related.meta.description }}</p>
</div>
{% endfor %}