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398267b142
### Summary
The `session` object is not a real Hash but responds to many methods of Hash
such as `[]`, `[]`, `fetch`, `has_key?`.
Since Ruby 2.3, Hash also supports a `dig` method.
This commit adds a `dig` method to `ActionDispatch::Request::Session` with the
same behavior as `Hash#dig`.
This is useful if you store a hash in your session, such as:
```ruby
session[:user] = { id: 1, avatar_url: "http://example.org/nyancat.jpg" }
```
Then you can shorten your code from `session[:user][:avatar_url]` to `session.dig :user, :avatar_url`.
### Other Information
I cherry-picked a commit from https://github.com/rails/rails/pull/23864, and modify a bit.
The changes are below:
* Converts only the first key to a string adjust to the `fetch` method.
* Fixes a test case because we cannot use the indifferent access since
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|---|---|---|
| .. | ||
| http | ||
| journey | ||
| middleware | ||
| request | ||
| routing | ||
| system_testing | ||
| testing | ||
| journey.rb | ||
| railtie.rb | ||
| routing.rb | ||
| system_test_case.rb | ||
