Introduction

The fast_jsonapi is a a lightning fast JSON:API serializer for Ruby Objects. Its github page can be accessed here.

The project is no longer maintained, but you might end up using it in some applications.

Issue

This is the usual error message:

NameError (uninitialized constant UserSerializer)

Tests

None of the following tests worked:

• Leave terminal and open it again;
• Open a new tab;
• Open the terminal on VS Code;
• Open the terminal on Linux console;
• Reload! Rails console;

Solution

For me, it worked to stop spring, which is a Rails application preloader.

1. Exit Rails console

   exit
   

2. Stop the spring Rails application preloader

   spring stop
   

   By the way, you can see all the available spring commands by using help

   spring help
   

3. Enter Rails console again

   rails c
   

   or

   rails console
   

4. Run the test command Here, I tried:

   UserSerializer.new( User.first ).serializable_hash
   

or just type

UserSerializer

It'll return the class itself

1. spring is still working
   In case you're a spring freak (Just kidding lol), spring is fine.

Leave the terminal

exit

and there you go, spring is fine

spring status

Conclusion

That's all. Hope you guys liked it. Let me know if you need any help.