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Fix false negatives for Rails/ActionControllerFlashBeforeRender when using implicit render or rescue block #1311

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merged 1 commit into from
Jul 27, 2024
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Fix false negatives for Rails/ActionControllerFlashBeforeRender when using implicit render or rescue block #1311

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1 change: 1 addition & 0 deletions changelog/fix_false_negatives_for_action_controller_flash_before_render.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
* [#1311](https://github.com/rubocop/rubocop-rails/pull/1311): Fix false negatives for `Rails/ActionControllerFlashBeforeRender` when using implicit render or rescue blocks. ([@tldn0718][])
10 changes: 5 additions & 5 deletions lib/rubocop/cop/rails/action_controller_flash_before_render.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,13 +72,13 @@ def followed_by_render?(flash_node)
if (node = context.each_ancestor(:if, :rescue).first)
return false if use_redirect_to?(context)

context = node
elsif context.right_siblings.empty?
return true
context = node.rescue_type? ? node.parent : node
end
context = context.right_siblings

context.compact.any? do |render_candidate|
siblings = context.right_siblings
return true if siblings.empty?

siblings.compact.any? do |render_candidate|
render?(render_candidate)
end
end
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179 changes: 178 additions & 1 deletion spec/rubocop/cop/rails/action_controller_flash_before_render_spec.rb
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Expand Up @@ -128,9 +128,36 @@ def create
end
end
RUBY

expect_offense(<<~RUBY)
class HomeController < #{parent_class}
def create
flash[:alert] = "msg" if condition
^^^^^ Use `flash.now` before `render`.
end
end
RUBY

expect_correction(<<~RUBY)
class HomeController < #{parent_class}
def create
flash.now[:alert] = "msg" if condition
end
end
RUBY
end

it 'does not register an offense when using `flash` before `redirect_to`' do
expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
flash[:alert] = "msg" if condition

redirect_to :index
end
end
RUBY

expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
Expand All @@ -145,6 +172,16 @@ def create
end

it 'does not register an offense when using `flash` before `redirect_back`' do
expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
flash[:alert] = "msg" if condition

redirect_back fallback_location: root_path
end
end
RUBY

expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
Expand All @@ -158,7 +195,7 @@ def create
RUBY
end

it 'registers an offense when using `flash` in multiline `if` branch before `render_to`' do
it 'registers an offense when using `flash` in multiline `if` branch before `render`' do
expect_offense(<<~RUBY)
class HomeController < #{parent_class}
def create
Expand All @@ -185,6 +222,29 @@ def create
end
end
RUBY

expect_offense(<<~RUBY)
class HomeController < #{parent_class}
def create
if condition
do_something
flash[:alert] = "msg"
^^^^^ Use `flash.now` before `render`.
end
end
end
RUBY

expect_correction(<<~RUBY)
class HomeController < #{parent_class}
def create
if condition
do_something
flash.now[:alert] = "msg"
end
end
end
RUBY
end

it 'does not register an offense when using `flash` in multiline `if` branch before `redirect_to`' do
Expand Down Expand Up @@ -217,6 +277,81 @@ def create
end
end
RUBY

expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
if condition
flash[:alert] = "msg"
redirect_to :index

return
end
end
end
RUBY
end

it 'registers an offense when using `flash` in multiline `rescue` branch before `render`' do
expect_offense(<<~RUBY)
class HomeController < #{parent_class}
def create
begin
do_something
flash[:alert] = "msg in begin"
^^^^^ Use `flash.now` before `render`.
rescue
flash[:alert] = "msg in rescue"
^^^^^ Use `flash.now` before `render`.
end

render :index
end
end
RUBY

expect_correction(<<~RUBY)
class HomeController < #{parent_class}
def create
begin
do_something
flash.now[:alert] = "msg in begin"
rescue
flash.now[:alert] = "msg in rescue"
end

render :index
end
end
RUBY

expect_offense(<<~RUBY)
class HomeController < #{parent_class}
def create
begin
do_something
flash[:alert] = "msg in begin"
^^^^^ Use `flash.now` before `render`.
rescue
flash[:alert] = "msg in rescue"
^^^^^ Use `flash.now` before `render`.
end
end
end
RUBY

expect_correction(<<~RUBY)
class HomeController < #{parent_class}
def create
begin
do_something
flash.now[:alert] = "msg in begin"
rescue
flash.now[:alert] = "msg in rescue"
end
end
end
RUBY
end

it 'does not register an offense when using `flash` in multiline `rescue` branch before `redirect_to`' do
Expand All @@ -235,6 +370,48 @@ def create
end
RUBY
end

it 'does not register an offense when using `flash` before `redirect_to` in `rescue` branch' do
expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
begin
do_something
flash[:alert] = "msg in begin"
redirect_to :index

return
rescue
flash[:alert] = "msg in rescue"
redirect_to :index

return
end

render :index
end
end
RUBY

expect_no_offenses(<<~RUBY)
class HomeController < #{parent_class}
def create
begin
do_something
flash[:alert] = "msg in begin"
redirect_to :index

return
rescue
flash[:alert] = "msg in rescue"
redirect_to :index

return
end
end
end
RUBY
end
end
end

Expand Down