Finding matches from an array rails - ruby-on-rails

Question

Patient have an array of clinician id's that they are shared with stored in shared_with. I would like to get a list of the patients where the current user, a clinician, has their id stored in the patient's shared_with
What I have tried to do now doesn't work:
#shared = Patient.find_by(shared_with: current_user.clinician.id).order("first_name asc")
For example, our current_user is associated with clinician.id 1 and there are patients with shared_with values of 1, 4 for patient 10 and 1, 7 for patient 15. I want #shared to be a list with just patient 10 and 15.
Patient model:
Patient:
clinician_id: integer
first_name: string
last_name: string
user_id: integer
shared_with: string
serialize :shared_with, Array
Patient.rb:
class Patient < ActiveRecord::Base
belongs_to :clinician
belongs_to :user
accepts_nested_attributes_for :user, :allow_destroy => true
end

Answer 1

As far as I can tell, the Patient model doesn't need a belongs_to for clinicians, and doesn't need a clinician_id -- unless these are related in another fashion...in which case, carry on.
Assuming your database supports an array field (such as postgres) then you're very close. You just need to wrap it in braces and since it's now in quotes, you'll need a #{} set for interpolation. Like so:
Patient.where(shared_with: "{#{current_user.clinician.id}}").order("first_name asc")
Doing a test with mock modeling you provided I see this in the console:
2.1.1 :005 > current_user = User.first
User Load (0.8ms) SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT 1
=> #<User id: 1, name: "benji", created_at: "2015-08-30 02:35:17", updated_at: "2015-08-30 02:35:17">
2.1.1 :006 > Patient.where(shared_with: "{#{current_user.clinician.id}}").order("first_name asc")
Clinician Load (59.0ms) SELECT "clinicians".* FROM "clinicians" WHERE "clinicians"."user_id" = $1 ORDER BY "clinicians"."id" ASC LIMIT 1 [["user_id", 1]]
Patient Load (0.7ms) SELECT "patients".* FROM "patients" WHERE "patients"."shared_with" = '{1}' ORDER BY first_name asc
=> #<ActiveRecord::Relation [#<Patient id: 2, clinician_id: nil, first_name: "tom", last_name: "jerry", user_id: nil, created_at: "2015-08-30 19:12:59", updated_at: "2015-08-30 19:26:37", shared_with: ["1"]>]>