CODEWITHSUNDEEP
ruby-on-railsformshtml-select
AdamNYC
AdamNYC

Reputation: 20445

Rails multiple select box for different models

I have a class User, which has many Events and belongs to many Groups. I want to allow user to create Event and restrict who he wants the invite by Group, by user id or by both.

How should I allow for multiple select box tag that shows both groups and individuals as selectable? I am thinking of creating something like acts_as, but it seems to be unnecessarily complicated.

Upvotes: 0

Views: 522

Answers (1)

tamersalama
tamersalama

Reputation: 4143

WARNING!!! First Iteration solution - it could be simpler

You might need a polymorphic relation to achieve the mapping.

Event
  has_many :invitations
  has_many :user_invitations, :class_name => "Invitation", :conditions => "inviteable_type = 'User'"
  has_many :group_invitations, :class_name => "Invitation", :conditions => "inviteable_type = 'Group'"


Invitation
  belongs_to :inviteable, :polymorphic => true
  #Invitations table would have inviteable_id, inviteable_type columns
User
  has_many :invitations, :as => :inviteable
Group
  has_many :invitations, :as => :inviteable

Now you can have `Event.first.inviteables (this will return a collection of Users and Groups)

In your view, name the options for your 2 collections differently, example:

<select name='event[event_inviteables]' ...>
<option value='group[][1]'>Group 1</option>
..
<option value='user[][1]'>User 1</option>

In your Event model, you'll need to have an event_inviteables= method to determine which ones are users, and which ones are groups and update the inviteable collections accordingly

Event
  def event_inviteables=(*args)
    user_ids = #some magic to extract user_ids from args
    group_ids = #some magic to extract group_ids from args
    self.user_invitation_ids = user_ids
    self.group_invitation_ids = group_ids
  end

Upvotes: 1

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