Wagtail Show latest blog posts on Homepage through a streamfield - wagtail

Question

I have 3 mains sections in my site, homepage, blog index, and blog specific. I am using the streamfield function in wagtail to order various sections in the homepage. One of those sections is for the latest three blog posts.
I have done this for the blog index page, but can't grab the latest blog posts in the streamfield.
My model looks like this
class CaseStudiesIndex(Page):
def casestudies(pages):
casestudies = CaseStudyPage.objects.all().order_by('-first_published_at')
return casestudies
intro = RichTextField(blank=True)
content_panels = Page.content_panels + [
FieldPanel('intro', classname="full")
]
class LatestPosts(blocks.StructBlock):
static = blocks.StaticBlock(admin_text='Latest posts: no configuration needed.',)
def casestudies(pages):
casestudies = CaseStudyPage.objects.all().order_by('-first_published_at')[:3]
return casestudies
class Meta:
icon = 'doc-full'
label = 'Latest Posts'
template = 'blocks/_latestPosts.html'
class HomePage(Page):
blocksbody = StreamField([
('lead_banner', LeadBanner()),
('latest_posts', LatestPosts()),
('team', Team())
],null=True,blank=True)
content_panels = Page.content_panels + [
StreamFieldPanel('blocksbody'),
]
In my block folder I am calling the file fine and it renders the wrapper fine but I can't grab any of the data, I have tried a bunch of ways but nothing returns.
{% load wagtailcore_tags wagtailimages_tags %}
{% load static %}
<section>
<div class="wrapper__inner">
<ul>
{% for case in self.casestudies %}
{{case.title}}
{% endfor %}
{% for case in self.case_studies %}
{{case.title}}
{% endfor %}
{% for case in self.latest_posts %}
{{case.title}}
{% endfor %}
{% for case in page.casestudies %}
{{case.title}}
{% endfor %}
{% for case in page.case_studies %}
{{case.title}}
{% endfor %}
{% for case in page.latest_posts %}
{{case.title}}
{% endfor %}
</ul>
</div>
</section>
For the Blog Index page that does work I do the following.
{% extends "inner_base.html" %}
{% load wagtailcore_tags %}
{% block body_class %}template-case-studies{% endblock %}
{% block content %}
<section>
<div class="wrapper__inner">
<h1>{{self.title}}</h1>
<ul>
{% include "blocks/CaseStudiesLatestBlock.html" %}
</ul>
</div>
</section>
{% endblock %}
And the CaseStudiesLatestBlock.html which works fine looks like
{% load wagtailcore_tags wagtailimages_tags %}
{% load static %}
{% for case in self.casestudies %}
<li>
<strong>{{ case.title }}</strong>
</li>
{% endfor %}

Answer 1

Defining your own methods on a StructBlock won't work - the self (or value) variable you receive on the template is just a plain dict, not the StructBlock object itself. (This might seem counter-intuitive, but it's consistent with how blocks work in general: just as a CharBlock gives you a string value to work with and not a CharBlock instance, StructBlock gives you a dict rather than a StructBlock instance.)
Instead, you can define a get_context method (as documented here) to provide additional variables to the template:
class LatestPosts(blocks.StructBlock):
static = blocks.StaticBlock(admin_text='Latest posts: no configuration needed.',)
def get_context(self, value, parent_context=None):
context = super(LatestPosts, self).get_context(value, parent_context=parent_context)
context['casestudies'] = CaseStudyPage.objects.all().order_by('-first_published_at')[:3]
return context
You can then access the casestudies variable in the template, e.g. {% for case in casestudies %}.