ICT:Asset-Chain Children Button logic (with boolean field)

Asset Hierarchy: "Children" Button Logic

Overview

This implementation displays a clickable button in the Top Assets table only when an asset has at least one child. It avoids complex and performance-heavy Views relationships by using a data-driven boolean flag.

Data Model

Entity Type: Asset (or Node)
Parent Field: field_as_parent_asset (Entity Reference pointing to the parent).
Indicator Field: field_as_has_children (Boolean).
- Default: Off (0)
- Logic: Marks if a Top Asset is a parent.

Automation (The Tweak Module)

The logic is handled automatically by the Heritage Tweaks module via hook_entity_presave.

Trigger: When a child asset is saved.
Action: The code identifies the parent referenced in field_as_parent_asset.
Result: It programmatically flips the parent's field_as_has_children to True (1).

Views Configuration

The button is rendered using a Global: Custom Text field in the Assets View.

Logic

The button uses Twig to check the boolean state before rendering:

{% if field_as_has_children %}
  <a href="/admin/asset-chain/{{ nid }}" class="button button--primary">Children</a>
{% endif %}

Key Settings

Filters: field_as_parent_asset is EMPTY (Ensures only Top Assets are listed).
Gin Styling: Uses button button--primary classes to match the Gin Admin Theme accent colors.
Field Order: The field_as_has_children field must be positioned above the Custom Text field and set to "Exclude from display."

Maintenance

Adding Children: The button appears automatically the moment the first child is saved.
Existing Data: To "wake up" a button for a Top Asset that already has children, simply Edit and Save one of its child records.

Hierarchy Integrity Rule

To enforce the "Single Level" hierarchy design:

Logic: The field_as_parent_asset field is hidden from the Edit form if field_as_has_children is TRUE.
Result: Prevents a Parent from being assigned a Parent (Nested recursion).
Exception: Top Assets without children can still be edited to assign a parent, allowing for data entry error correction.