change method up/down

db/migrate/20191126082849_create_users.rb

 class CreateUsers < ActiveRecord::Migration[6.0]
-  def change
+  def up
     create_table :users do |t|
       t.string :first_name
       t.string :last_name
@@ -48,4 +48,8 @@ class CreateUsers < ActiveRecord::Migration[6.0]
     # add_index :users, :confirmation_token,   unique: true
     # add_index :users, :unlock_token,         unique: true
   end
+
+  def down
+    drop_table :users
+  end
 end

db/migrate/20191126083110_create_jobs.rb

 class CreateJobs < ActiveRecord::Migration[6.0]
-  def change
+  def up
     create_table :jobs do |t|
       t.string :title
       t.string :level
@@ -11,9 +11,13 @@ class CreateJobs < ActiveRecord::Migration[6.0]
       t.integer :category
       t.datetime :post_date
       t.datetime :expiration_date
-      t.references :company, null: false, foreign_key: true
+      t.string :company_id
 
       t.timestamps
     end
   end
+
+  def down
+    drop_table :jobs
+  end
 end

db/migrate/20191126083151_create_user_jobs.rb

 class CreateUserJobs < ActiveRecord::Migration[6.0]
   def change
     create_table :user_jobs do |t|
-      t.references :user, null: false, foreign_key: true
-      t.references :job, null: false, foreign_key: true
+      t.string :user_id
+      t.string :job_id
       t.datetime :applied_at
       t.datetime :viewed_at
       t.datetime :favorited_at

db/migrate/20191126083216_create_city_jobs.rb

 class CreateCityJobs < ActiveRecord::Migration[6.0]
   def change
     create_table :city_jobs do |t|
-      t.references :city, null: false, foreign_key: true
-      t.references :job, null: false, foreign_key: true
+      t.string :city_id
+      t.string :job_id
 
       t.timestamps
     end

db/migrate/20191126083227_create_industry_jobs.rb

 class CreateIndustryJobs < ActiveRecord::Migration[6.0]
   def change
     create_table :industry_jobs do |t|
-      t.references :industry, null: false, foreign_key: true
-      t.references :job, null: false, foreign_key: true
+      t.string :industry_id
+      t.string :job_id
 
       t.timestamps
     end

db/schema.rb

@@ -17,15 +17,14 @@ ActiveRecord::Schema.define(version: 2019_11_26_083335) do
     t.string "region"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
+    t.index ["name"], name: "index_cities_on_name", unique: true
   end
 
   create_table "city_jobs", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
-    t.bigint "city_id", null: false
-    t.bigint "job_id", null: false
+    t.string "city_id"
+    t.string "job_id"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
-    t.index ["city_id"], name: "index_city_jobs_on_city_id"
-    t.index ["job_id"], name: "index_city_jobs_on_job_id"
   end
 
   create_table "companies", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
@@ -35,6 +34,7 @@ ActiveRecord::Schema.define(version: 2019_11_26_083335) do
     t.string "address"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
+    t.index ["email"], name: "index_companies_on_email", unique: true
   end
 
   create_table "crawl_urls", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
@@ -52,12 +52,10 @@ ActiveRecord::Schema.define(version: 2019_11_26_083335) do
   end
 
   create_table "industry_jobs", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
-    t.bigint "industry_id", null: false
-    t.bigint "job_id", null: false
+    t.string "industry_id"
+    t.string "job_id"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
-    t.index ["industry_id"], name: "index_industry_jobs_on_industry_id"
-    t.index ["job_id"], name: "index_industry_jobs_on_job_id"
   end
 
   create_table "jobs", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
@@ -71,22 +69,19 @@ ActiveRecord::Schema.define(version: 2019_11_26_083335) do
     t.integer "category"
     t.datetime "post_date"
     t.datetime "expiration_date"
-    t.bigint "company_id", null: false
+    t.string "company_id"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
-    t.index ["company_id"], name: "index_jobs_on_company_id"
   end
 
   create_table "user_jobs", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
-    t.bigint "user_id", null: false
-    t.bigint "job_id", null: false
+    t.string "user_id"
+    t.string "job_id"
     t.datetime "applied_at"
     t.datetime "viewed_at"
     t.datetime "favorited_at"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
-    t.index ["job_id"], name: "index_user_jobs_on_job_id"
-    t.index ["user_id"], name: "index_user_jobs_on_user_id"
   end
 
   create_table "users", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
@@ -111,11 +106,4 @@ ActiveRecord::Schema.define(version: 2019_11_26_083335) do
     t.index ["username"], name: "index_users_on_username", unique: true
   end
 
-  add_foreign_key "city_jobs", "cities"
-  add_foreign_key "city_jobs", "jobs"
-  add_foreign_key "industry_jobs", "industries"
-  add_foreign_key "industry_jobs", "jobs"
-  add_foreign_key "jobs", "companies"
-  add_foreign_key "user_jobs", "jobs"
-  add_foreign_key "user_jobs", "users"
 end