Simplify model

app/models/github/team_member.rb

@@ -1,8 +1,3 @@
 class Github::TeamMember < ApplicationRecord
-  has_one :user,
-    foreign_key: :uid,
-    primary_key: :user_id,
-    class_name: "User",
-    inverse_of: :github_team_memberships,
-    dependent: :destroy
+  belongs_to :user
 end

app/models/user.rb

@@ -123,11 +123,7 @@ class User < ApplicationRecord
 
   has_many :cohort_memberships, dependent: :destroy
 
-  has_many :github_team_memberships,
-    class_name: "Github::TeamMember",
-    primary_key: :uid,
-    inverse_of: :user,
-    dependent: :destroy
+  has_many :github_team_memberships, class_name: "Github::TeamMember", dependent: :destroy
 
   has_many :challenges, dependent: :destroy
   has_many :watched_videos, class_name: "User::WatchedVideo", dependent: :destroy

test/factories/github/team_members.rb

@@ -1,6 +1,6 @@
 FactoryBot.define do
   factory :github_team_member, class: 'Github::TeamMember' do
-    user_id { SecureRandom.hex }
+    user { create :user }
     team_name { SecureRandom.hex }
   end
 end