rails select and include

Question

Can anyone explain this?

Project.includes([:user, :company])

This executes 3 queries, one to fetch projects, one to fetch users for those proje

Answer 1

I wanted that functionality myself,so please use it. Include this method in your class

#ACCEPTS args in string format "ASSOCIATION_NAME:COLUMN_NAME-COLUMN_NAME"

def self.includes_with_select(*m)
    association_arr = []
    m.each do |part|
      parts = part.split(':')
      association = parts[0].to_sym
      select_columns = parts[1].split('-')
      association_macro = (self.reflect_on_association(association).macro)
      association_arr << association.to_sym
      class_name = self.reflect_on_association(association).class_name 
      self.send(association_macro, association, -> {select *select_columns}, class_name: "#{class_name.to_sym}")
    end
    self.includes(*association_arr)
  end

And you will be able to call like: Contract.includes_with_select('user:id-name-status', 'confirmation:confirmed-id'), and it will select those specified columns.