displaying the user that owns the notification in rails - ruby-on-rails-4

Question

i got an application that includes Activities, Users, Talks and Notifications. the model include
Users Model
has_many :talks, :dependent => :destroy
has_many :notifications, :dependent => :destroy
has_many :activities, :dependent => :destroy
Notifications Model
has_many :users, -> {uniq}, through: :talks
belongs_to :user
belongs_to :trackable, polymorphic: true
has_many :talks
has_many :notifications
When creating a talk i do this
def create
#activity = Activity.find(params[:activity_id])
#talk = #activity.talks.create!(talk_params)
#talk.user = current_user
#talk.save
##users= #activity.users.where("id NOT IN (?)", [#activity.user.id, #talk.user])
#users= User.joins(:talks).where(talks: {id: #activity.talk_ids}).push(#activity.user).reject {|user| user == #talk.user }.uniq
## Lets create a notification for all those who created a comment in this activity
#users.each do |user|
Notification.create(activity:#activity, user: user)
end
## Lets create a notification for the owner activity
#Notification.create(activity:#activity, user: #activity.user)
redirect_to user_path(current_user)
end
and with this a notification is created what i want is to display the name of the owner of the notification .. i dont know how to go about that

Answer 1

Try this code:
#users.each do |user|
noti = Notification.create(activity:#activity, user: user)
notifications = #activity.user.notifications
notifications << noti
#activity.user.update(notifications:, notifications)
end
If each notification has creator(:user), receiver(:user), so you need to have two columns for Notification model (sender_id, recipient_id).
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You need read about inheritance from single table(User)
Inheritance from single table(1)
Inheritance from single table(2)