irb: warn: can't alias context from irb_context. (3.5.0.beta4 and 3.5.0 final)

[marcusg]

Hey,

After upgrading from 3.5.0.beta3 to 3.5.0.beta4 I receive a warning when using the rails console command like:

bundle exec rails console
Loading development environment (Rails 5.0.0.rc2)
irb: warn: can't alias context from irb_context.
irb(main):001:0>

Version beta3 works well, the warning is only visible in beta4.

[jasnow]

That did not help - i know

[myronmarston]

That warning is coming from IRB here:

https://github.com/ruby/ruby/blob/32674b167bddc0d737c38f84722986b0f228b44b/lib/irb/extend-command.rb#L188

It's apparently happening because rspec-core, when loaded, defines context on the top level unless you disable monkey patching.

Can you provide a repo that repros this? I tried reproing it in isolation and have failed so far.

[marcusg]

@myronmarston ah thanks, I'll try to create a repro the next days. Do you mean this line config.disable_monkey_patching! in spec_helper.rb? It seems monkeypatching is disabled in both of my scenarios, but only with rspec-rails-3.5.0.beta4 the warning gets printed.

[myronmarston]

Do you mean this line config.disable_monkey_patching! in spec_helper.rb? It seems monkeypatching is disabled in both of my scenarios, but only with rspec-rails-3.5.0.beta4 the warning gets printed.

Correct, that's what I meant, but I just realized why that doesn't solve the problem here: because you have to opt-in to disabling monkey patching (instead of opting in to monkey patching), the monkey patches, including context being defined on main still happen up-front, and then the config option disables them. So it still triggers the IRB warning.

[fables-tales]

hey @marcusg could you provide us with a reproduction case for this issue? Just a repository we can clone that demonstrates the problem. With that we can debug :)

[marcusg]

@samphippen yes, of course. I'll add repro steps as soon as possible.

[marcusg]

I've created a repro app https://github.com/marcusg/rspec-rails-issue-1645

• ruby 2.2.3p173 and 2.3.0p0
• a fresh rails 5.0.0 app
• only rspec-rails added
• using rspec-rails-3.5.0.beta3 works fine
• using rspec-rails-3.5.0 produces warning when running "bundle exec rails"

[fables-tales]

Repro confirmed.

[ghost]

I've got the same warning after upgrading rspec-rails to 3.5.1

[myronmarston]

There's an attempted fix in #1678 -- can one of you who has ran into this issue give that a try?

[myronmarston]

Can you merge this into the 3-5 branch as well?

Sent from my iPhone

On Jul 22, 2016, at 7:01 PM, Jon Rowe notifications@github.com wrote:

Closed #1645 via #1678.

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[JonRowe]

Done.

[marcusg]

Works for me with 3-5-maintenance branch, thank you guys!

[ClaudioFloreani]

I'm still having issues with:

• ruby 2.3.1p112
• Rails 4.2.8
• rspec (3.6.0)
• rspec-core (3.6.0)
• rspec-expectations (3.6.0)
• rspec-mocks (3.6.0)
• rspec-rails (3.6.0)
• rspec-support (3.6.0)

$ rails c
Loading development environment (Rails 4.2.8)
irb: warn: can't alias context from irb_context.
2.3.1 :001 > exit

[EDIT] Just learned many other gems could cause this — I will investigate this further.

[eagleas]

Hi! This solve warning for me:

1. Add

RSpec.configure do |config|
...
  config.disable_monkey_patching!
...
end

2. Patch in Gemfile
   gem 'rspec_junit_formatter'
   to:
   gem 'rspec_junit_formatter', require: false

[pirj]

Also, config.disable_monkey_patching! will be the set by default in RSpec 4.

[x-yuri]

db-query-matchers also triggers this warning by requiring rspec/core. Do you think this line is needed? It seems like it's not.

P.S. Here's where the methods (including context) are supposedly added to main:
https://github.com/rspec/rspec-core/blob/v3.10.1/lib/rspec/core/dsl.rb#L84

[philippfrank]

Happened via guard-rspec for me. See guard/guard-rspec#396.

gem 'guard-rspec', require: false fixed this.