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Deploying Rails App to Heroku: ERROR: relation “todo_lists” does not exist

Richard •
I've been stuck on this problem for a few days. Can you guys provide some guidance to fix this and deploy the database to Heroku?

Here is part of my schema.rb:

      create_table "todo_items", force: :cascade do |t|
        t.string "title"
        t.bigint "user_id", null: false
        t.datetime "created_at", precision: 6, null: false
        t.datetime "updated_at", precision: 6, null: false
        t.boolean "completed", default: false
        t.datetime "completed_at"
        t.bigint "todo_id", null: false
        t.index ["todo_id"], name: "index_todo_items_on_todo_id"
        t.index ["user_id"], name: "index_todo_items_on_user_id"
      end
    
      create_table "todos", force: :cascade do |t|
        t.string "title"
        t.bigint "user_id", null: false
        t.bigint "project_id", null: false
        t.datetime "created_at", precision: 6, null: false
        t.datetime "updated_at", precision: 6, null: false
        t.index ["project_id"], name: "index_todos_on_project_id"
        t.index ["user_id"], name: "index_todos_on_user_id"
      end

I'm trying to deploy a new Rails 6 application to Heroku and have done the following:
- heroku login
- heroku create app
- heroku addons:create heroku-postgresql:hobby-dev
- git push heroku master
- heroku run rails db:migrate

When I run the last command heroku run rails db:migrate - I get the following error messages:

NOTE: I created the wrong todo_list reference and table at one point, then later removed them, so todo_lists does not exist at all on my schema.

Error message #1

    StandardError: An error has occurred, this and all later migrations canceled:            PG::UndefinedTable: ERROR:  relation "todo_lists" does not exist    ...    /app/db/migrate/20200606053040_create_todo_items.rb:3:in `change'    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:212:in `transaction'    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1361:in `ddl_transaction'    ...    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:212:in `transaction'    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1361:in `ddl_transaction'    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1309:in `execute_migration_in_transaction'

Error message #2
    Caused by:
    ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR:  relation "todo_lists" does not exist
    ...
    /app/db/migrate/20200606053040_create_todo_items.rb:3:in `change'
    ...
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1002:in `migrate'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1310:in `block in execute_migration_in_transaction'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1361:in `block in ddl_transaction'
    ...
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:212:in `transaction'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1361:in `ddl_transaction'

Error message #3
    Caused by:
    PG::UndefinedTable: ERROR:  relation "todo_lists" does not exist
    ...
    /app/db/migrate/20200606053040_create_todo_items.rb:3:in `change'
    ...
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1002:in `migrate'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1310:in `block in execute_migration_in_transaction'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1361:in `block in ddl_transaction'
    ...
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `transaction'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:212:in `transaction'
    /app/vendor/bundle/ruby/2.7.0/gems/activerecord-6.0.3.2/lib/active_record/migration.rb:1361:in `ddl_transaction'

Here is part of my migrations rails db:migrate:status:

       up     20200604053157  Create todos
       up     20200606053040  Create todo items
       up     20200606235328  Add completed to todo items
       up     20200606235537  Add completed at to todo items
       up     20200608050430  Remove todo list id from todo items
       up     20200608050957  Drop todo list
       up     20200608051132  Add todo id to todo items

20200606053040_create_todo_items.rb
    class CreateTodoItems < ActiveRecord::Migration[6.0]
      def change
        create_table :todo_items do |t|
          t.string :title
          t.references :user, null: false, foreign_key: true
          t.references :todo_list, null: false, foreign_key: true
    
          t.timestamps
        end
      end
    end

20200608050430_remove_todo_list_id_from_todo_items.rb
    class RemoveTodoListIdFromTodoItems < ActiveRecord::Migration[6.0]
      def change
        safety_assured { remove_reference :todo_items, :todo_list, null: false, foreign_key: true }
      end
    end

20200608050957_drop_todo_list.rb
    class DropTodoList < ActiveRecord::Migration[6.0]
      def change
        drop_table :todo_lists
      end
    end

20200608051132_add_todo_id_to_todo_items.rb
    class AddTodoIdToTodoItems < ActiveRecord::Migration[6.0]
      disable_ddl_transaction!
    
      def change
        add_reference :todo_items, :todo, null: false, index: {algorithm: :concurrently}
      end
    end
Chris Oliver •
Richard,

It looks like you've got a migration to drop the todo_lists table, but no migration to create it. Sounds like you meant to delete that migration but forgot to.
Richard •
Chris Oliver finally! Thanks!
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