fixed some bugs

app/models/company.rb

 class Company < ApplicationRecord
-  has_many :jobs
+  has_many :jobs, dependent: :destroy
 end

app/models/job.rb

@@ -2,7 +2,7 @@ class Job < ApplicationRecord
   has_and_belongs_to_many :industries
   has_and_belongs_to_many :cities
   belongs_to :company
-  has_many :apply_jobs
-  has_many :favorite_jobs
-  has_many :history_job
+  has_many :apply_jobs, dependent: :destroy
+  has_many :favorite_jobs, dependent: :destroy
+  has_many :history_job, dependent: :destroy
 end