Centralise detection of previous route (#1222)

* Remove unused previous

* Centralise previous object detection. Remove falling back to a number if not found

* Apply suggestions from code review

app/controllers/admin/field_groups_controller.rb

@@ -22,8 +22,6 @@ def new
   def edit
     @field_group = FieldGroup.find(params[:id])
 
-    @previous = FieldGroup.find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
-
     respond_with(@field_group)
   end
 

app/controllers/admin/tags_controller.rb

@@ -28,7 +28,7 @@ def new
   # GET /admin/tags/1/edit                                                AJAX
   #----------------------------------------------------------------------------
   def edit
-    @previous = Tag.find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Tag.find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
   end
 
   # POST /admin/tags

app/controllers/admin/users_controller.rb

@@ -35,7 +35,7 @@ def new
   # GET /admin/users/1/edit                                                AJAX
   #----------------------------------------------------------------------------
   def edit
-    @previous = User.find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = User.find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@user)
   end

app/controllers/application_controller.rb

@@ -269,5 +269,14 @@ def find_class(asset)
     end
   end
 
+  # In a number of places, we pass ?previous=(id) or ?previous=crm.find_form...
+  # This method centralises all of the places we can pass in a previous param
+  # and extracts an int ID, or nil
+  def detect_previous_id
+    return unless params[:previous]
+    return if params[:previous].start_with?("crm")
+
+    params[:previous].to_i
+  end
   ActiveSupport.run_load_hooks(:fat_free_crm_application_controller, self)
 end

app/controllers/entities/accounts_controller.rb

@@ -45,7 +45,7 @@ def new
   # GET /accounts/1/edit                                                   AJAX
   #----------------------------------------------------------------------------
   def edit
-    @previous = Account.my(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Account.my(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@account)
   end

app/controllers/entities/campaigns_controller.rb

@@ -84,7 +84,7 @@ def new
   # GET /campaigns/1/edit                                                  AJAX
   #----------------------------------------------------------------------------
   def edit
-    @previous = Campaign.my(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Campaign.my(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@campaign)
   end

app/controllers/entities/contacts_controller.rb

@@ -51,7 +51,7 @@ def new
   #----------------------------------------------------------------------------
   def edit
     @account = @contact.account || Account.new(user: current_user)
-    @previous = Contact.my(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Contact.my(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@contact)
   end

app/controllers/entities/leads_controller.rb

@@ -52,7 +52,7 @@ def new
   def edit
     get_campaigns
 
-    @previous = Lead.my(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Lead.my(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@lead)
   end
@@ -108,7 +108,7 @@ def convert
     @accounts = Account.my(current_user).order('name')
     @opportunity = Opportunity.new(user: current_user, access: "Lead", stage: "prospecting", campaign: @lead.campaign, source: @lead.source)
 
-    @previous = Lead.my(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Lead.my(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@lead)
   end

app/controllers/entities/opportunities_controller.rb

@@ -57,7 +57,7 @@ def edit
     @account  = @opportunity.account || Account.new(user: current_user)
     @accounts = Account.my(current_user).order('name')
 
-    @previous = Opportunity.my(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Opportunity.my(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@opportunity)
   end

app/controllers/tasks_controller.rb

@@ -58,7 +58,7 @@ def edit
     @category = Setting.unroll(:task_category)
     @asset = @task.asset if @task.asset_id?
 
-    @previous = Task.tracked_by(current_user).find_by_id(Regexp.last_match[1]) || Regexp.last_match[1].to_i if params[:previous].to_s =~ /(\d+)\z/
+    @previous = Task.tracked_by(current_user).find_by_id(detect_previous_id) || detect_previous_id if detect_previous_id
 
     respond_with(@task)
   end