Rails 4 - using 'where' to search & display certain users - ruby-on-rails-4

Question

I'm a little stuck and any help or advise would be much appreciated.
I would like to display only users that have a resume but I am unsure how
- I have the below codings in my file - your advise & help will be much appreciated.
in my user/index.html
<% users.each do |user| %>
<%= user.resume.summary %>
<% end %>
schema
create_table "resumes", force: true do |t|
t.text "summary"
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
models
user.rb
has_one :resume
resume.rb
belongs_to :user
I would like to do a search that only displays users with a resume.
I tried the below but no luck
<% users.where(resume_id: !nil).each do |user| %>
<%= user.resume.summary %>
<% end %>
<% users.where("resume IS NOT NULL != ?", "").each do |user| %>
<%= user.resume.summary %>
<% end %>
I tried writing as a scope but no luck
user.rb file
scope :users_with_resumes, -> {where(['resume != ?', nil])}
users/index.html.erb file
<% #users.users_with_resumes.each do |userj| %>
<%= user.resume.summary %>
<% end %>

Answer 1

You're close to hitting the mark, but your syntax in your attempts is slightly off:
# This won't work because you're now searching for the value !nil (or 'true')
<% users.where(resume_id: !nil).each do |user| %>
<%= user.resume.summary %>
<% end %>
# This is a double negative, syntactically incorrect, and referencing resume instead of resume_id
<% users.where("resume IS NOT NULL != ?", "").each do |user| %>
<%= user.resume.summary %>
<% end %>
You should instead use one of the following:
users.where.not(resume_id: nil)
users.where("resume_id IS NOT NULL")
I think you'll find either of those statements will serve your purpose whether scoped or otherwise.

Answer 2

The below code displays only users with resumes
Association
user has_one resume
resume belongs_to user
schema
create_table "resumes", force: true do |t|
t.text "summary"
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
user.rb
scope :users_with_resumes, -> {where("id in (select user_id from resumes)")}
or instead of a scope you can write a method
def self.users_with_resumes
where("id in (select user_id from resumes)")
end
users/index.html.erb [this display only users with a resume]
<% #users.users_with_resumes.each do |user| %>
<%= user.resume.summary %>
<% end %>