Add "block.admin_preview" block

[phansys]

Add "block.admin_preview" block in order to show a preview for admin lists in dashboard

I am targeting this branch, because this feature respects BC.

Rebase from #5530.

This is an example of how this block looks like:

Changelog

### Added
- Added "block.admin_preview" block in order to show a preview for admin lists in dashboard

To do

• Find a way to set "_sort_by" and "_sort_order" params out of a request context.

[phansys]

In order to avoid the workaround near the datagrid sorting, we should find a way to provide this parameter to the admin or the datagrid out of a request context.
Is there a good reason to forbid this in the way we have now?
Currently, there is no way to set this value:

SonataAdminBundle/src/Admin/AbstractAdmin.php

Lines 796 to 806 in 50038ed

	if (isset($filterParameters['_sort_by']) && \is_string($filterParameters['_sort_by'])) {
	if ($this->hasListFieldDescription($filterParameters['_sort_by'])) {
	$filterParameters['_sort_by'] = $this->getListFieldDescription($filterParameters['_sort_by']);
	} else {
	$filterParameters['_sort_by'] = $this->createFieldDescription(
	$filterParameters['_sort_by']
	);
	$this->getListBuilder()->buildField(null, $filterParameters['_sort_by'], $this);
	}
	}

SonataAdminBundle/src/Datagrid/Datagrid.php

Lines 223 to 229 in 50038ed

	public function setValue($name, $operator, $value)
	{
	$this->values[$name] = [
	'type' => $operator,
	'value' => $value,
	];
	}

[franmomu]

In order to avoid the workaround near the datagrid sorting, we should find a way to provide this parameter to the admin or the datagrid out of a request context.
Is there a good reason to forbid this in the way we have now?

I don't know, but 👍 to add a way to configure it out of a request context.

[core23]

Can you please add a screenshot how this would look like

[phansys]

Can you please add a screenshot how this would look like

Done.

[VincentLanglet]

You mean field_description.name == constant('Sonata\AdminBundle\Datagrid\ListMapper::NAME_SELECT') ?

I think you can already use this condition

[VincentLanglet]

Suggested change

	{% if field_description.option('code') == constant('Sonata\\AdminBundle\\Datagrid\\ListMapper::NAME_SELECT') %}
	{% if field_description.name == constant('Sonata\\AdminBundle\\Datagrid\\ListMapper::NAME_SELECT') %}

[core23]

Do we really need a session here?

[phansys]

Yes, I'm afraid:

SonataAdminBundle/src/Admin/AbstractAdmin.php

Lines 2695 to 2702 in f9fbd32

	public function getListMode()
	{
	if (!$this->hasRequest()) {
	return 'list';
	}
	return $this->getRequest()->getSession()->get(sprintf('%s.list_mode', $this->getCode()), 'list');
	}

[jordisala1991]

Does the request has a hasSession or something? We could add a check to the code

[phansys]

Sure, I was thinking the same.
Let me check and I'll update the PR if possible.

[phansys]

Here you are: #7080.

[franmomu]

I've rebased and push with --force-with-lease to use the DatagridInterface constants.

[VincentLanglet]

Thanks !