adds poll/booth_assigments

app/models/poll.rb

@@ -1,4 +1,6 @@
 class Poll < ActiveRecord::Base
+  has_many :booth_assigments
+  has_many :booths, through: :booth_assigments, class_name: "Poll::BoothAssignment"
   has_many :voters, through: :booths, class_name: "Poll::Voter"
   has_many :officers, through: :booths, class_name: "Poll::Officer"
   has_many :questions

app/models/poll/booth.rb

@@ -1,5 +1,7 @@
 class Poll
   class Booth < ActiveRecord::Base
+    has_many :booth_assigments
+    has_many :polls, through: :booth_assigments
     has_many :voters
     has_many :officing_booths, dependent: :destroy
     has_many :officers, through: :officing_booths

app/models/poll/booth_assignment.rb

@@ -0,0 +1,6 @@
+class Poll
+  class BoothAssignment < ActiveRecord::Base
+    belongs_to :booth
+    belongs_to :poll
+  end
+end