Allow to search over custom field attributes

[ferblape]

Search over a custom field model attributes has not a direct solution, the main problems I see are:

• jsonb format is not officially supported by pg_search see this
• custom fields are dynamic, while the list of attributes searchable is statically provided to the model, i.e:

    multisearchable(
      against: [:name, :charge_es, :charge_en, :charge_ca, :bio_es, :bio_en, :bio_ca],
      ...

Nevertheless I think it could be done with a bit of research and hacking on the pg_search gem (although it requires to deeply understand the queries behind the search).

[furilo]

Casecommons/pg_search#252 (comment)