Question

User has many Relationships

In my relationships table i have a field :referee containing a user_id for each record.
Each record also has user_id foreign key

I want to find the records that have current_user.id in the :referee field and select user_id from the foreign key field for each one.

refs = Relationship.where(:referee => current_user.id).select("user_id").all 

This results in an array like this,

[#<Relationship user_id: 16>, #<Relationship user_id: 17>]

I now want to find User attributes for each of the ids in the array, I’ve tried but so far failed, for example:

User.where(:id => @refs_user_id).each do |user|
  user.name
end

Did some reading/watching on active record advanced queries, scopes etc but can’t quite seem to grasp what’s required here. Any suggestions would be much appreciated, thanks!

Answer 1

You can select just the user_id components like this:

User.where(:id => @refs_user_id.map(&:user_id)).each do |user|
  user.name
end