Invalid Rails 'Partial Errors'

Question

I came across a sporadic error, allegedly because Rails sometimes could not find a partial one. However, due to the fact that the error appeared only in some cases, I suspected and then found another error underlying it.

My question is: does anyone know of a reliable way to determine the underlying error in this case?

The obvious mistake:

Rails threw this error when responding to a JSON view request new.json.erb:

ActionView::Template::Error (Missing partial insightly_contacts/search_result with {:locale=>[:en], :formats=>[:json], :handlers=>[:erb, :builder, :coffee]}. Searched in:
  * "/path/to/project/app/views"

This was strange for two reasons:

• A partial question is present, and it joyfully does most of the time.

• The partial question does not apply to the format :json; although it new.json.erbis a JSON template, obviously it makes it similar partial (specifying the format :html):

  form_object.possible_insightly_contacts.map { |insightly_contact|
    {
      id: insightly_contact.id,
      html: render(partial: 'insightly_contacts/search_result', locals: { insightly_contact: insightly_contact }, formats: :html)
    }
  }.to_json.html_safe
  

Notes:

• possible_insightly_contacts returns ActiveRelation.

• , form_object . , possible_insightly_contacts ; 'x' , 'z' ( , "x" "z" / !)

• form_object, possible_insightly_contacts, - - possible_insightly_contacts - .

:

( : , , " " )

, - , insightly_contact. , : , - , .

:

? // , , , .

HTML, , .

, , , .

- / ?

?