问题
When I try running Unicorn after setting up postgres (works perfectly with Trinidad and Thin) I get the following error.
dyld: lazy symbol binding failed:
Symbol not found: _rb_thread_select
Referenced from:/Users/pls/.rvm/gems/ruby-2.2.0@coinino/extensions/x86_64-darwin-13/2.2.0/do_postgres-0.10.14/do_postgres/do_postgres.bundle
Expected in: flat namespace
Datamapper connects to the database normally inside a model.rb which then is required in app.rb.
What is wrong and how do I fix it?
Edit: Looks like this is a bug in Ruby 2.2.0.
回答1:
A call used by old versions of the pg gem has been removed in Ruby 2.2. More recent versions of the gem no longer use this call; I know the latest version (0.18.1) doesn't, but I don't know when that change was made. You can update the pg gem by running the following command:
bundle update pg
As long as you're doing this, you may want to run just a plain bundle update to update all of your project's gems to the most recent versions—who knows what else might be incompatible with Ruby 2.2?
As always when updating dependencies, test that the update doesn't introduce any new bugs before you deploy the new version to production. I doubt pg will cause any problems, but other gems might.
回答2:
It looks like this is a bug in Ruby 2.2.0. Going to Ruby 2.1.5 gets things going without trouble.
来源：https://stackoverflow.com/questions/27862098/problems-with-postgres-and-unicorn-server