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I have created 2 Content entities. Entity A has an "Entity Reference Field" with multiple values to Entity B. This all work as expected.

What I want to achieve is, to create a link from Entity B page, that when the user clicks on it, it will be added (appended) to Entity A "Entity Reference Field".

What's the best way to get this done?

  • (I know I can use the Flag and Flag lists module, but there are limitations to it like it will be impossible/difficult to make these lists public/anonymous. After trying Flag lists out, it also didn't feel like a very Drupal native approach.)
  • (Getting a list of referenced items etc. is an other challenge, but my biggest problem is to get the linking approach working first.)
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  • I have some ideas, but would like more info. When you say "a link," what would that be like? Your description sounds like a checkbox, which I don't quite get.
    – beltouche
    Commented Jan 20, 2022 at 14:17
  • I mean like a real href link: <a href="Entity_A">Entity A</a>
    – cateye
    Commented Jan 20, 2022 at 14:20
  • That blows my ideas out of the water. My inclination is to trigger an AJAX call to some custom endpoint with A & B as parameters and have the endpoint load up entity A, add the reference as necessary, and resave. Someone else here I'm sure can fill in the gaps more readily than I.
    – beltouche
    Commented Jan 20, 2022 at 14:25

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The direction I'm trying to take is, to add the reference with:

$node->{$target_field}[] = $id;

But I'm struggling to figure out how to create this custom form that will be displayed on the node view.

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