Multiple Rails engines bundle install error

Build Environment
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1

Hi,
We have a Rails app with 2 engines.
Those engines require each others like this:
engine_1 is independent.
engine_2 requires engine_1.
The app requires both engines.
We have test in /spec/dummy from each engine’s folders.

About 2 days ago, suddenly, our builds failed from the migration step of engine_1/spec/dummy.
We saw that it asked for some environment variables from engine_2.
Then we recognized the error started from bundle install step.
Our config looks like this:

      - run:
          name: bundle rails_app
          command: cd rails_app && bundle install

      - run:
          name: bundle engine_1/spec/dummy
          command: cd engine_1/spec/dummy && bundle install
      - run:
          name: bundle engine_2/spec/dummy
          command: cd engine_2/spec/dummy && bundle install

Instead of using its own gems, the second bundle install command reuses every gems used by the first, including engine_2.
We have tried swapping the order but still, only the first bundle install has effect. The other 2 just copied the first one.

Here we stuck. Do you have any recommendation for this issue?
Thank you.

2

We have solved this!
It was an error from Bundler.
CircleCI uses latest version which is 1.16.0 which have some bugs when resolving gems.
We use version 1.15.4 and it’s fine.

3

Hello @peara,

Have you tried with Bundler 1.16.1 yet? There was some bugs fixed in the release which may solve this issue. I’d like to confirm.

Thanks!

4

@zzak
I think it hasn’t been fixed yet.
For some reason Bundler decided to install gems in a common folder instead of app folder, which causes all apps to share the same installed gems.