Add Gemfile hack

Unfortunately bundler (1.x and 2.x) seems to be horrible at resolving
the dependencies here.

I chatted with someone who knows a fair bit more than me about how
bundler's algorithm works, and he suggested that the issue was that it
was having trouble locking down to a specific Rails version.

This allows us to specify the Rails version we want ("~> 5.1.0" does the
trick) which causes bundler to not struggle for 15 minutes to resolve
dependencies anymore.

1 files changed, 4 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
index bf5c806..b1849de 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,6 +6,10 @@ branch = ENV.fetch('SOLIDUS_BRANCH', 'master')
 
 gem "solidus", github: "solidusio/solidus", branch: branch
 
+if ENV['RAILS_VERSION']
+  gem "rails", ENV['RAILS_VERSON']
+end
+
 if ENV.fetch('DB') == 'postgres'
   gem 'pg'
 end