Add favorites controller and templates

Allows saving and deleting favorites

app/controllers/api/v1/favorites_controller.rb

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+class Api::V1::FavoritesController < Api::V1::ApiController
+    before_action :set_party, only: ['create']
+
+    def create
+        party_id = favorite_params[:party_id]
+        party = Party.find(party_id)
+
+        if !current_user
+            raise Api::V1::UnauthorizedError
+        elsif party.user && current_user.id == party.user.id
+            raise Api::V1::SameFavoriteUserError
+        elsif Favorite.where(user_id: current_user.id, party_id: party_id).length > 0
+            raise Api::V1::FavoriteAlreadyExistsError
+        else
+            ap "Create a new favorite"
+            object = {
+                user_id: current_user.id,
+                party_id: favorite_params[:party_id]
+            }
+
+            @favorite = Favorite.new(object)
+            render :show, status: :created if @favorite.save!
+        end
+    end
+
+    def destroy
+        raise Api::V1::UnauthorizedError unless current_user
+        
+        @favorite = Favorite.where(user_id: current_user.id, party_id: favorite_params[:party_id]).first
+        render :destroyed, status: :ok if @favorite && Favorite.destroy(@favorite.id)
+    end
+
+    private
+
+    def set_party
+        @party = Party.where("id = ?", params[:party_id]).first
+    end
+
+    def favorite_params
+        params.require(:favorite).permit(:id, :party_id)
+    end
+end

app/views/api/v1/favorites/base.json.rabl

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+object :favorite
+
+attributes :id, :user_id, :party_id, :created_at, :updated_at

app/views/api/v1/favorites/destroyed.json.rabl

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+object false
+
+node :destroyed do
+    true
+end

app/views/api/v1/favorites/show.json.rabl

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+object @favorite
+
+extends 'api/v1/favorites/base'