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I developed custom entities in the code, using entity references : A <- R -> C. Entity "R" contains references to "A" and "B".

I'd like to add a pseudo-field in entity "A", configurable in view display, that could render referencing entities (mean "R" entities referencing "A" with a given field "F").

Since I made my own classes for the entities, I'd really like to continue that way and prevent using hooks. I know I could achieve this with views, but it seems more logical, reusable, and quicker, to put it in entity code.

  1. Is there a way to add the display field to my entity without using hook_entity_extra_field_info() ? For example could I create my own FieldEntityManager ?

  2. Is EntityViewBuilder the right place to render the field with my own data ?

  3. In a more generic way, would it be possible to develop a custom field type "referencing_entities" that I could reuse in every referenced entities I have ? Would it be only a field formatter since I don't need to store anything ? Is it possible to access to the entity from the field to query referencing entities ?

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  • I am looking for the same requirement i.e. having pseudo field with formatter drupal 8. Did you find your answer to this query? Commented Oct 25, 2017 at 13:07
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    Add a computed field. Theres a core issue just rtbc that makes this easier and discusses some catches, I suggest looking at that. Commented Nov 12, 2017 at 11:54

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As time goes by there's Extra Field now.

Provides a plugin type for extra fields in entity view.

This module allows developers to add custom fields by simply providing a plugin. Site builders can use these fields in entity view modes as normally. Extra fields do not store data and do not have a field widget. Extra fields typically combine existing entity data and format it for display.

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