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Django Admin multiple template inheritance

I thought it was a quite simple task but turns out it's not.
So, I have two different mixins to use on a Django admin class. they both have some codes in it with templates.
admin.py
class AdminMixin01(admin.ModelAdmin):
change_form_template = "change_form1.html"
class AdminMixin02(admin.ModelAdmin):
change_form_template = "change_form2.html"
class ModalAdmin(AdminMixin01, AdminMixin02, admin.ModelAdmin):
pass
change_form1.html
{% extends "change_form.html" %}
{% block content %}
{{ block.super }}
Form 1
{% endblock content %}
change_form2.html
{% extends "change_form.html" %}
{% block content %}
{{ block.super }}
Form 2
{% endblock content %}
it's looks quite simple both python and html sides.
The problem is Django renders only first mixin's template and ignores the second mixin's template. In this case only change_form1.html rendered into original change_form.html template and no traces from change_form2.html.
The python codes in the both mixin are working except html codes.
Any ideas ?

Creating a custom template tag to replace the for loop - Django

I am trying to simplify my code by creating a custom template tag for a 'for loop' that use frequently on my Django web application. I thought it would be a simple straight process, but something isn't working right... I can use some assistance in catching my error.
Here is my code.
views.py
class ArticleView(DetailView):
model = Articles
def get_context_data(self, **kwargs):
context = super(ArticleView, self).get_context_data(**kwargs)
context['s_terms'] = scientific_terms.objects.all()
return context
template tag
#register.filter(name='term')
def term(value):
{% for term in s_terms %}
{{ term.short_description }}
{% endfor %}
template.html
{% Neurons|term %}
Thank you for your assistance, in advance.

You are mixing Python code with the Django Template Language. The template tags are plain Python code, as they are defined inside a Python module. A working example would be:
#register.filter(name='term')
def term(terms):
output = ''
for term in terms:
output = '{0} {1}'.format(output, term.short_description)
return output
Then you could use it like this:
{{ s_terms|term }}
Maybe what you want is simply to create a reusable Django template.
For example, create a new template named terms.html:
templates/terms.html
{% for term in terms %}
<p>{{ term.short_description }}</p>
{% endfor %}
Then, in another template, you could include this partial template:
templates/index.html (name is just an example)
{% extends 'base.html' %}
{% block content %}
<h1>My application</h1>
{% include 'terms.html' with terms=s_terms %}
{% endblock %}

Flask required form on home page

I am looking for some kind of example with flask using a required form on the home page of my site that requires the user to select an option before being allowed onto the rest of the site. The form is used for selecting a collection out of my mongo db database. I need to know what collection the user wants to use before going anywhere else on the site. Once this done I need to make sure I can use this information on my other route and views on my site.

What you want is to implement a login infrastructure.
using flask, you have a base template, where every other template is extending, what you can do is something like the following:
base.html:
{% if current_user.is_authenticated %}
<content>
{% block content %}
{% endblock %}
</content>
{% else %}
<login-form>
{% block content %}
{% endblock %}
</login-form>
{% endif %}
using this code, the content is shown only and only if the user is authenticated. in login-form HTML you should have a form to ask the credentials needed to authenticate the user and then allow them access to rest of the site.
in other template files, you continue to use the same practice:
dashboard.html:
{% extends 'base.html' %}
{% block content %}
<YOUR HTML CONTENT>
{% endblock %}
the content of dashboard.html is only shown to the user, if they are logged in(current_user.is_authenticated = True)
this is because dashboard.html is shown inside the content block of base.html witch is only shown or rendered if that condition is met.
you can use anything else instead of is_authenticated like the collection being selected or anything like that. the procedure to do it is the same.

simple loop in rendered template django cms plugin

I want to loop data taken from database in rendered template. Using cms plugin.
I dont have problem looping data in html template. But if i use CMSPlugin to insert new app in placeholder, nothing shows.
If i run url localhost:port/test.html.I got input what i want. But rendered template doesnt loop data.
{% for post in posts %}
{{ post.firstoption }}
{% endfor %}
if I use code below, nothing shows in my rendered template. Values are passed in rendered template. Because, if i try {{instance.firstoption}} i get value shown in template. Problem is i cant loop data with tag instance.
{% for post in instance.posts %}
{{ post.firstoption }}
{% endfor %}
I also tried {% for post in instance.posts_set.all %}
and {% for post in instance.posts.all %}
cms_plugins.py
class pricing(CMSPluginBase):
model = mymodel
name = _("myplugin")
render_template = "template.html"
cache = False
def render(self, context, instance, placeholder):
context.update({'instance': instance})
return context
models.py
class mymodel(CMSPlugin):
firstoption = models.CharField(max_length=200)
def __str__(self):
return self.firstoption

It is probably because you need to call all on your posts
{% for post in instance.posts.all %}
{{ post.firstoption }}
{% endfor }

Display all model data inside html page

I'm trying to build a website that has products and categories.
When you are on the page of a product, you can click a button to see a list of all the categories it falls under.
You can click another button, that appears on all pages, to see a list of all the categories overall.
In the html page see_all_categories, I wrote a simple block like this:
{% extends 'base.html' %}
{% load staticfiles %}
{% block content%}
{{Category.all}}
{% endblock content %}
I expect to see a messy printout of all the categories but I don't. It doesn't return an error, but it produces nothing, other than the base.html.
What am I doing wrong?

You want to display a list of the categories. I assume your Category model owns an attribute named "title" which is the representation of your Category.
If you're using Django template engine or Jinja2, you can make a for loop inside your template like this :
{% for cat in Category.objects.all %}
{{ cat.title }}
{% endfor %}
As a troubleshooting, I'd suggest you didn't pass your Category model to your template, that is not done automatically. You have to add your model to the context before rendering the template.
As mentionned in the comments, here is doc for template rendering with Django templates.
Django Template Guide
To add your model to the context you can follow this guide.
I don't intend to help you further because I lack of information and that may vary a LOT according to your settings. (Class Based views ? Function based views ? What kind of template are you using... And so on)

I figured out the solution after many long annoying hours of trying everything. I feel dumb but I want to spare the next guy the massive pain in the two-pack.
This is what I did:
In the Views.py, I changed the view function for this page FROM this:
def view_all_categories(request):
context = {'Category' : Category}
return render(request, 'store/see_all_categories.html', context)
TO this
def view_all_categories(request):
all_cats = Category.objects.all().order_by('id')
context = {'all_categories' : all_cats}
return render(request, 'store/see_all_categories.html', context)
and in the page see_all_categories.html itself, I changed it (from the question) TO this:
{% extends 'base.html' %}
{% load staticfiles %}
{% block content%}
{% for cat in all_categories %}
<p>{{ cat.name }}</p>
{% endfor %}
{% endblock content %}
And now it works!!