This all makes sense to do either this template or that template.
But let me describe another situation. You have a profile form and a form where users can upload personal profile related documents. Since the profile form is already very long the documents moved to a new form.
Everything works great. Now we want to use the bootstrap tabs to do Profile | Documents for user friendliness.
Now I know because we are using two seperate forms if you submit the documents the changes on the profile won't save and vice versa.
I have added the document form in the tab using
<div role="tabpanel" class="tab-pane" id="documents">
{{ render(controller('ManyAppBundle:Document:createDocument', {'viewOnly': true})) }}
</div>
The 'viewOnly': true is a query parameter and is not required by the action.
My question now becomes if the profile tab renders the document template it must only show the upload widget and the submit where as when you go directly to the document page it must show the title and side bar and everything. So I did try
{% if not viewOnly %}
{% extends ... %}
{% endif %}
That gave problems because you can't use extends within a if. Like you suggested in other answers try using
{% extends viewOnly == true ? ... %}
This reolved the Twig issue up to the execution of the code when viewOnly is false.
When viewOnly is false it must extend the base template used by all other templates but if it is true I only want to show this:
{{ form_start(form, { 'style': 'horizontal', 'col_size': 'sm' }) }}
{% if form.documents is defined %}
{{ form_row(form.documents) }}
{% endif %}
{{ form_row(form.submit, { 'attr': { 'class': 'btn btn-success' } }) }}
{{ form_end(form) }}
But now with the top
{% extends viewOnly == true ? ... %}
if viewOnly becomes false it fails with Template "" can't be find.
Is there a way to say extends this specific template that will be the same result of not extending any template?
Or alternatively is there a way of saying extend this when viewOnly true but nothing happens on the fail?