rails 4.1.6 scope: in model not responding properly

Question

Hi i am in a bit of a bind here because i am trying to use scope and cant seem to make it work.

I am now using it in my model section like so.

has_many :friends, through: :user_friendships,
                    scope -> {where(user_friendships: { state: 'accepted' })}

also before i was using it like so from the turorials and i found out it was depricated and had to re adjust the code that i used above but the problem is that it also encountered an error

has_many :friends, through: :user_friendships,
                conditions: { user_friendships: { state: 'accepted' }}

this was the error that i encountered while using the first line of code and the second line of code in the terminal

/home/simplybel/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.6/lib/active_support/core_ext/hash/keys.rb:71:in `block in assert_valid_keys': Unknown key: :scope. Valid keys are: :class_name, :class, :foreign_key, :validate, :autosave, :table_name, :before_add, :after_add, :before_remove, :after_remove, :extend, :primary_key, :dependent, :as, :through, :source, :source_type, :inverse_of, :counter_cache, :join_table (ArgumentError)

if anybody can help me with this problem it would really be great and appreciated! also i am a bit of a noob in rails so i might not understand properly the syntax that you might put in the answer so can you pls. make it noob friendly and thanks!

Answer 1

You don't need the word scope in there. The lambda should just be given as the second argument to has_many :

has_many :friends, ->{ where(user_friendships: { state: 'accepted' }) },
                   through: :user_friendships

You can see more examples in the Active Record Assocations Rails Guide .

Edit: Here's the method signature from the docs for has_many :

has_many (name, scope = nil, options = {}, &extension)

In your code:

1. :friends is the name argument
2. ->{ where(...) } is the scope argument
3. { through: :user_friendships } is the options argument (but Ruby lets us omit the {} for a Hash when it's the last argument).