[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called #38560
Description
Steps to reproduce
rails new testapp -d postgresql
cd testapp
rails g scaffold post title body:text
rails db:migrate
rails c
irb(main):001:0> Post.create(title: "This is a test 1", body: "This is a body 1")Expected behavior
I would expect to get a response saying that the Post was successfully created.
Actual behavior
objc[18501]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
objc[18501]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
System configuration
Rails version: Rails 6.0.2.1
Ruby version: ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]