symfony3 override fields theme from vich bundle - twig

I have installed VichUploaderBundle into my Symfony app and would like to have better control of the appearance of the upload buttons. I have taken the contents of fields.html.twig located in the bundle itself, and copied them into the same file at the path app/Resources/views/myControllerName/fields.html.twig This is also where all the other twig templates are for that set of controllers.
I can not seem to affect anything on the page through this method. Yes I have cleared the cache, I have even removed the cache directory.
Am I placing the file in the wrong place?

You can override that form theme in many ways, just when you customize vich_file_widget and/or vich_image_widget e.g.:
{% extends 'base.html.twig' %}
{% form_theme form _self %}
{% block vich_file_widget %}
{# some content… #}
{% endblock %}
{% block content %}
{{ form(my_form) }}
{% endblock %}

Thanks for the effort #jkucharovic, I was already using the 3rd method you were suggesting. My question was whether or not I put the fields.html.twig file in the correct place. Turns out I did not. For others that come along with this question, to override the fields file in the VichUploaderBundle for twig you must put a copy of the fields.html.twig file at the following path so that Symfony can override what comes with the bundle.
the fields file is found here and should not be edited...
vendor/vich/uploader-bundle/Resources/views/Form/fields.html.twig
a copy of that file should be placed here in Symfony 3. This file is editable.
app/Resources/VichUploaderBundle/views/Form/fields.html.twig

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In craftCMS I've created a field to load content but this field is not showing up when i change my code in the template. I've checked if I used the correct folder
At first i thought it was the cache but when i go to utilities to clear the cache the same error still occurs. Also when I write any new character other than twig code the browser gives an error with the new code but when I delete it, it's still the same old code
Here is my code:
{% extends "index" %}
{% block content %}
This is not generate on my local
<div class="can't load new code below and new class right here"
{{ entry.headingDescription }}
{{ entry.headingTitle }}
</div
{% endblock %}
My structure:

How to set permission to twig template

I have created a twig template using which I am displaying the some content on the front end. I want this template to be accessible only for a particular role. could anyone please tell me how can I set the permission.
This should be done in controller where you render this view.
However you could wrap template in condition
{% if is_granted('ROLE_ADMIN') %}
{# template content #}
{% endif %}

Load extends after blocks

So I have been working with twig now, and I use a function manner to render all of my html. My question is, is there a way to render the blocks (with functions) first, and then the {% extends X %} afterwards?
example:
{% extends 'base.html.twig' %}
{% block body %}
{{ resource('script', 'google.com') }}
{% endblock %}
I would want the resource function to trigger, before the file is extended, in some way.
Reason why:
In the base I define another function which loads a head with a base configuration, it also gives easy options to load certain libraries such as bootstrap etc. But I want the user able to later, externally in a body add more resources and make them pop up in the head instead of in the body. I can give more code if needed but I think this will suffice since this is more a twig question than a php question.

How to push values to array in templates and partials to output them in layout?

We are using Twig as our templating engine but I'm stuck with a problem of the rendering order now. See - https://straightupcraft.com/articles/twig-processing-order
We are using amp for our new site and with amp and web components in general it is necessary to import the components (once) to use them. So the idea was to create a Twig Extension to accomplish exactly this. Everytime a component is used it is called via this twig function call. The function is checking the component, adding it to a stack and you can use it from now on. The stack then is transformed into a list of imports for the head of the page.
The problem here is Twigs top to bottom rendering. When I call said function in a partial or a template the rendering of "layout.twig" already took place and all function calls below/after are not affecting the stack.
Is there an option to change the rendering to inside out, so that the rendering is first using the lowest partial and "bubbles" up to templates and finally layout without them rendering before?
Another way to get the values in layout would nice as well.
Desired behavior:
Layout.twig
{{ getAllComponents() }}
{# should output component1 and component2 #}
{% block content %}
Page.twig
{% extends Layout.twig %}
{{ addComponent('component1') }}
{% include partials.twig %}
<component1>...</component1>
partials.twig
{{ addComponent('component2') }}
<component2>...</component2>
Actual behavior:
Layout.twig
{{ getAllComponents() }}
{# is empty #}
There is no option to change this behavior. However you can use a trick to archive this:
Render your content to a variable before you call getAllComponents()
layout.twig
{% set mainContent %}
{% block content %}{% endblock %}
{% endset %}
{{ getAllComponents() }}
{{ mainContent }}
There actually is a magical solution to this problem -- some genius wrote this Deferred Twig Extension which lets you run some code (output a variable, call a function, etc) in a block near the top of your layout, but wait until the rest of the twig templates have parsed before executing them. There's an example on that github page showing how you can achieve this.
As far as I know, no you cannot switch the rendering of a TWIG template.
However, I would recommend possibly looking at the {% embed %} or {{ render }} tags.
Embed allows specific TWIG files to be placed within others with variables, so you could pass each component into their relevant partials.twig file.
Render allows the use of embedding a separate controller action, so you create a ControllerAction that took in a component variable and renders its own TWIG file.
Documentation on Embed: https://twig.sensiolabs.org/doc/2.x/tags/embed.html
Documentation containing Render: https://twig.sensiolabs.org/doc/2.x/api.html

Combining optional block with element in twig

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{# Base template #}
Content etc...
{% block special %} {# may be overridden by child template #}{% endblock %}
{# child template #}
{% block special %} Here, the special sidebar is filled! {% endblock %}
The base page should show just the content:
// base template:
Content etc...
And the child page:
// child template
Content etc...
<div class"special-sidebar"> Here, the special sidebar is filled! </div>
Where and how do I put the html for this? I could define it in every child, but that means you have to remember to use the correct html each time, I'd rather set this in the base template and not bother with it. But I don't want empty elements in my page if the block is not overridden.
You can solve it like this, if you want to display a certain block only if it has content. Hope, this is what you're looking for.
Example index.html.twig
{% set _block = block('dynamic') %}
{% if _block is not empty %}
{{ _block|raw }}
{% endif %}
Example part.html.twig
{% extends "index.html.twig" %}
{% block dynamic %}
Block content goes here.
{% endblock %}
Source: How to check if a block exists in a twig template - Symfony2

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