Rails Complex Grouping by Associations

Question

I am creating a custom form builder.

A Form has_many Sections .

A Section has_many Fields .

A Field has_many User_Values .

There is a column on the User_Values table called cloned_index . I use this for when a user makes a duplicate of a section but need to keep the sections unique.

My Question:

Can someone help me write a query that for every section, group the fields by the cloned_index of the field's user values.

I Currently Have:

form.sections.each do |section| section.fields.each do|field|
  field.user_values.group_by(&:cloned_index)
end

This currently doesn't work and is very tough to follow. I'm sure there's an easy way to do this that I'm just not seeing right now.

Answer 1

form.sections.joins(fields: [:user_values]).group("user_values.cloned_index") 

You need to join the tables to group them together. The above query will return the sections grouped by cloned_index

If you want to group the fields along with sections then try

fields.joins(:user_values,:section]).where({sections: {form_id: form.id}}).group("sections.id , user_values.cloned_index")

This will return fields of the form grouped by section ID and cloned_index