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* ActionController::Parameters#deep_dup
* Tests for ActionController::Parameters#deep_dup
* Fix test for ActionController::Parameters#deep_dup
* More tests for ActionController::Parameters#deep_dup
[Rafael Mendonça França + Pavel Evstigneev]
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Style/SpaceBeforeBlockBraces
Style/SpaceInsideBlockBraces
Style/SpaceInsideHashLiteralBraces
Fix all violations in the repository.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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- Tests for dup'ing params was separately added in a separate file in
https://github.com/rails/rails/pull/25735.
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`#initialize_copy` to manually duplicate the underlying parameters hash
It looks like `ActionController::Parameters#dup` is leftover from when the class inherited from `Hash`. We can just trust `#dup`, which already copies the `@permitted` instance variable (confirmed by tests). We still define a `#initialize_copy` to make `@parameters` a copy that can be mutated without affecting the original instance.
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When `ActionController::Parameters` is duplicated with `#dup`, it doesn't create a duplicate of the instance variables (e.g. `@parameters`) but rather maintains the reference (see <http://ruby-doc.org/core-2.3.1/Object.html>). Given that the parameters object is often manipulated as if it were a hash (e.g. with `#delete` and similar methods), this leads to unexpected behaviour, like the following:
```
params = ActionController::Parameters.new(foo: "bar")
duplicated_params = params.dup
duplicated_params.delete(:foo)
params == duplicated_params
```
This fixes the bug by defining a private `#initialize_copy` method, used internally by `#dup`, which makes a copy of `@parameters`.
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