rake db：migrate的迁移错误

Question

I created a new model, but when I run the rake db: migrate command, it shoots me the following error:

rake aborted!
Gem::LoadError: You have already activated rake 10.4.0, but your Gemfile requires rake 
10.3.2. Prepending `bundle exec` to your command may solve this.
/Users/yedidyaweiner/projects/music-app/config/boot.rb:4:in `<top (required)>'
/Users/yedidyaweiner/projects/music-app/config/application.rb:1:in `<top (required)>'
/Users/yedidyaweiner/projects/music-app/Rakefile:4:in `<top (required)>'
LoadError: cannot load such file -- bundler/setup
/Users/yedidyaweiner/projects/music-app/config/boot.rb:4:in `<top (required)>'
/Users/yedidyaweiner/projects/music-app/config/application.rb:1:in `<top (required)>'
 /Users/yedidyaweiner/projects/music-app/Rakefile:4:in `<top (required)>'

(See full trace by running task with --trace)

What am I doing wrong?

Answer 1

采用

bundle exec rake db:migrate

Answer 2

您还可以通过运行更新您的宝石

bundle update

Answer 3

Execute the below commands

a) delete your Gemfile.lock file

b)bundle install

It should update Gemfile.lock with correct rake.

OR

a) gem uninstall rake -v 10.4.0

b) gem install rake -v 10.3.2

---

then try running 'rake db:migrate'. it should work.