Update foreign keys instead of redefining them

db/migrate/20220714211614_set_on_delete_for_anonymous_blocks.rb

@@ -3,11 +3,8 @@
 class SetOnDeleteForAnonymousBlocks < ActiveRecord::Migration[6.1]
   def change
     change_table :anonymous_blocks do |t|
-      t.remove_references :user
-      t.references :user, null: false, foreign_key: true, on_delete: :cascade
-
-      t.remove_references :question
-      t.references :question, null: true, foreign_key: true, on_delete: :null
+      t.foreign_key :users, on_delete: :cascade
+      t.foreign_key :questions, on_delete: :cascade
     end
   end
 end

db/migrate/20220714212414_set_on_delete_for_mute_rules.rb

@@ -3,8 +3,7 @@
 class SetOnDeleteForMuteRules < ActiveRecord::Migration[6.1]
   def change
     change_table :mute_rules do |t|
-      t.remove_references :user
-      t.references :user, null: false, foreign_key: true, on_delete: :cascade
+      t.foreign_key :users, on_delete: :cascade
     end
   end
 end

db/schema.rb

@@ -31,8 +31,8 @@ ActiveRecord::Schema.define(version: 2022_07_14_212414) do
     t.string "identifier"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
-    t.bigint "user_id", null: false
     t.bigint "question_id"
+    t.bigint "user_id"
     t.index ["identifier"], name: "index_anonymous_blocks_on_identifier"
     t.index ["question_id"], name: "index_anonymous_blocks_on_question_id"
     t.index ["user_id"], name: "index_anonymous_blocks_on_user_id"
@@ -125,7 +125,7 @@ ActiveRecord::Schema.define(version: 2022_07_14_212414) do
     t.string "muted_phrase"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.bigint "user_id", null: false
+    t.bigint "user_id"
     t.index ["user_id"], name: "index_mute_rules_on_user_id"
   end
 
@@ -324,8 +324,8 @@ ActiveRecord::Schema.define(version: 2022_07_14_212414) do
     t.index ["user_id"], name: "index_users_roles_on_user_id"
   end
 
-  add_foreign_key "anonymous_blocks", "questions"
-  add_foreign_key "anonymous_blocks", "users"
-  add_foreign_key "mute_rules", "users"
+  add_foreign_key "anonymous_blocks", "questions", on_delete: :cascade
+  add_foreign_key "anonymous_blocks", "users", on_delete: :cascade
+  add_foreign_key "mute_rules", "users", on_delete: :cascade
   add_foreign_key "profiles", "users"
 end