# How to cache Ruby (GEM) dependencies
**URL:** https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196
**Category:** Caching
**Tags:** build-cache
**Created:** [January 9, 2017, 6:55pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196 "2017-01-09T18:55:38Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@viktorbenei](https://discuss.bitrise.io/u/viktorbenei)
#### Post date: [January 9, 2017, 6:55pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/1 "2017-01-09T18:55:38Z")
## Setup & technical notes
Ruby GEMs are installed into a single directory by default. You can get the location of this directory with `gem environment gemdir`. If you want to change this directory you can set the `$GEM_HOME` environment variable, this will be picked up by `gem install` and it’ll install the GEMs to the location specified by `$GEM_HOME`.
Now that you know where the Ruby GEMs are stored you can easily cache the directory. As in any other #build-cache setup you need two steps:
1. put the `Cache:Pull` step after the `Git Clone` step
2. put the `Cache:Push` step to the very end of the Workflow
3. You can now just select the `Cache:Push` step and add the Ruby GEM home directory to the **Cache paths** input.
_ **Important** : You can’t just add `gem environment gemdir` to the input as you can only reference Environment Variables in the inputs directly, and `$GEM_HOME` is not set by default on the [Bitrise.io](http://Bitrise.io) VMs._
There are two simple solutions for this issue:
- Set `GEM_HOME` as an App Env Var to, let’s say, `$HOME/.gem`.
- Add a `Script step` to your workflow and set the `$GEM_HOME` environment variable there
The second option is usually more error proof as you don’t change the location of gem home,
you just set the environment variable to the path where it’s located.
## Example workflow
```yml
example:
steps:
- script:
title: Set GEM_HOME env var
inputs:
- content: |-
#!/bin/bash
set -ev
envman add --key GEM_HOME --value "$(gem environment gemdir)"
- git-clone: {}
- cache-pull: {}
# ... Add your steps here.
# You can `gem install` Ruby gems with Script steps here too,
# just make sure it's between the `cache-pull` and `cache-push` steps.
- cache-push:
inputs:
- cache_paths: |-
$GEM_HOME
```
**For more information about the Bitrise Build Cache see the [DevCenter](http://devcenter.bitrise.io/caching/about-caching/).**
---
### Author:  [@matheus.vechietin-if](https://discuss.bitrise.io/u/matheus.vechietin-if)
#### Post date: [March 19, 2019, 6:52pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/2 "2019-03-19T18:52:01Z")
Hi, sorry for comment in this old post, but i did exactly what’s in the “How To” and my cache still does not working with Gems, both Push and Pull steps works fine but when I try to run any command that uses one of my Gems it does not work, i’m get the error “no such file or directory”, can you help me to understand why this? Without cache works fine all Gems commands.
---
### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 20, 2019, 12:06pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/3 "2019-03-20T12:06:52Z")
Hy there,
Could you send us a build’s url with this issue?
is the pod install still in the build?
how did you configure the cache push step? 🤔
---
### Author:  [@matheus.vechietin-if](https://discuss.bitrise.io/u/matheus.vechietin-if)
#### Post date: [March 21, 2019, 11:54am UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/4 "2019-03-21T11:54:29Z")
Hi @fehersanyi-bitrise,
This is the build’s url: [Bitrise - Mobile Continuous Integration and Delivery - iOS & Android Build Automation](https://app.bitrise.io/build/99b5f3a6eea5bbd2)
My Bitrise workflow with cache:
danger\_tests:
> ```
> steps:
> - script:
> inputs:
> - content: |-
> #!/bin/bash
> set -ev
> envman add --key GEM_HOME --value "$(gem environment gemdir)"
> title: Create GEM_HOME
> - activate-ssh-key@4.0.3:
> run_if: '{{getenv "SSH_RSA_PRIVATE_KEY" | ne ""}}'
> - git-clone: {}
> - cache-pull@2.0.1:
> inputs:
> - is_debug_mode: 'true'
> - certificate-and-profile-installer@1.10.1: {}
> - script@1.1.5:
> inputs:
> - content: |-
> #!/bin/bash --login -eo pipefail
> gem environment gemdir
> bundle install
> title: Install bundled gems
> - fastlane:
> inputs:
> - lane: "$FASTLANE_LANE"
> - update_fastlane: 'false'
> - work_dir: "$FASTLANE_WORK_DIR"
> - script@1.1.5:
> inputs:
> - content: |-
> #!/usr/bin/env bash
> bundle exec danger --verbose
> title: Run Danger
> - cache-push@2.0.5:
> inputs:
> - is_debug_mode: 'true'
> - cache_paths: "$GEM_HOME -> ./Gemfile.lock"
>
> ```
---
### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 21, 2019, 12:58pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/5 "2019-03-21T12:58:05Z")
I think the problem is that this
```auto
- cache-push@2.0.5:
inputs:
- is_debug_mode: 'true'
- cache_paths: "$GEM_HOME -> ./Gemfile.lock"
```
lsat line in reality looks like this
`- cache_paths: "gem environment gemdir -> ./Gemfile.lock"`
so the path is not good 🤔
So I think you should check with a script step first, what is this file where the gems are placed first and add that to the env var at the begining.
---
### Author:  [@matheus.vechietin-if](https://discuss.bitrise.io/u/matheus.vechietin-if)
#### Post date: [March 21, 2019, 1:17pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/6 "2019-03-21T13:17:33Z")
Ok, I understand, I’ll try now set path manually and see if this work, thanks in advice.
Question: why when I download the site cache does it come with all folders correctly?
---
### Author:  [@matheus.vechietin-if](https://discuss.bitrise.io/u/matheus.vechietin-if)
#### Post date: [March 21, 2019, 2:23pm UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/7 "2019-03-21T14:23:01Z")
Hello again @fehersanyi-bitrise
Can you check this build please? [https://app.bitrise.io/build/f18431af8a895027](https://app.bitrise.io/build/f18431af8a895027)
I set the path manually on my Env Vars, and put one script step to validate folder.
In the log it appears to me with all folders with my gems, but when I execute any command of any gem, I receive that error.
Thanks in advance for help!
---
### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 22, 2019, 8:32am UTC](https://discuss.bitrise.io/t/how-to-cache-ruby-gem-dependencies/196/8 "2019-03-22T08:32:24Z")
could you try using the cocoapod install step instead of the script? 🤔
and please include your gemfile.lock in the repository 🙃