Fwd: How to create records in has_many through association

Hi All,

I have two models (User and Event) with multiple has_many through
associations, where my current association is by the below logic:

  1. User can participate in many events through EventGroup
  2. Event has many users through EventGroup
  3. User can like many events through Eventgroup
  4. Event has many user likes through Eventgroup

Model:

class User
has_many :event_groups
has_many :events,:through => :event_groups
has_many :event_likes,:through => :event_groups,:class_name =>
"Event"end
class Event
has_many :event_groups
has_many :users,:through => :event_groups
has_many :user_likes,:through => :event_groups,:class_name =>
"User"end
class EventGroup
belongs_to :user
belongs_to :event
belongs_to :user_like,:class_name => “User”
belongs_to :event_like,:class_name => "Event"end

EventGroup columns:

user_id
event_id
user_like_id
event_like_id

After setting up the association I tried to create the association
record
with the below code:

user = User.first
user.event_likes << Event.first
user.save

This is working fine and I can able to get the events liked by that
user
as user.event_likes.

But I am not able to get the User records by event.user_likes, so I
checked my eventgroup record. It has the nil value for user_like_id.

#<EventGroup id: 24, event_id: 1, user_id: 2,event_like_id: 1,
user_like_id: nil>

Let me know the proper way to do this.
regards,
Loganathan
Mob: +91 7760780741 | +91 9944414388
Skype: loganathan.sellappa
ViewMe http://vizualize.me/loganathan

Hey Loganathan,

I think the problem is that you trying to model 2 different things
throught
the same joint model and that does not work, because on the join model
you
modelling something with 2 different values of events and of users, so
you
can have values, user_id = 1, event_id = 1, user_like_id = 2, event_id =
2,
this represents 2 different users and 2 different events. so basically
you
have to create to joint models.

class User
has_many :event_appreciations
has_many :event_attendings
has_many :events, :through => :event_attendings
has_many :event_likes, :through => :event_groups, :class_name =>
“Event”
end

class Event
has_many :event_appreciations
has_many :event_attendings
has_many :users,:through => :event_appreciations
has_many :user_likes, :through => :event_attendings, :class_name =>
“User”
end

class EventAppreciation
belongs_to :user
belongs_to :event
end
class EventAttending
belongs_to :user
belongs_to :event
end

this should solve your problem,

All the best,

Andre

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