Tasks creation (mostly)

app/models/task_status.rb

@@ -8,6 +8,15 @@ class TaskStatus < ApplicationRecord
 
   validates :name, presence: true, uniqueness: { scope: :project }
   validates :category, presence: true
+  validate :associations_should_have_same_project
 
   scope :default_order, -> { order(:category, :name) }
+
+  private
+
+  def associations_should_have_same_project
+    return if workflow.project == project
+
+    errors.add(:workflow, "Doesn't belong in the same project")
+  end
 end