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Fix false negatives for implicit render or rescue blocks
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3 files changed

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-6
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3 files changed

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‎changelog/fix_false_negatives_for_action_controller_flash_before_render.md

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Original file line numberDiff line numberDiff line change
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* [#1311](https://github.com/rubocop/rubocop-rails/pull/1311): Fix false negatives for `Rails/ActionControllerFlashBeforeRender` when using implicit render or rescue blocks. ([@tldn0718][])

‎lib/rubocop/cop/rails/action_controller_flash_before_render.rb

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -72,13 +72,13 @@ def followed_by_render?(flash_node)
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if (node = context.each_ancestor(:if, :rescue).first)
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return false if use_redirect_to?(context)
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context = node
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elsif context.right_siblings.empty?
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return true
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context = node.rescue_type? ? node.parent : node
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end
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context = context.right_siblings
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81-
context.compact.any? do |render_candidate|
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siblings = context.right_siblings
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return true if siblings.empty?
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siblings.compact.any? do |render_candidate|
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render?(render_candidate)
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end
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end

‎spec/rubocop/cop/rails/action_controller_flash_before_render_spec.rb

Lines changed: 178 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -128,9 +128,36 @@ def create
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end
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end
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RUBY
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expect_offense(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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flash[:alert] = "msg" if condition
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^^^^^ Use `flash.now` before `render`.
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end
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end
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RUBY
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expect_correction(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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flash.now[:alert] = "msg" if condition
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end
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end
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RUBY
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end
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it 'does not register an offense when using `flash` before `redirect_to`' do
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expect_no_offenses(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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flash[:alert] = "msg" if condition
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redirect_to :index
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end
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end
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RUBY
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expect_no_offenses(<<~RUBY)
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class HomeController < #{parent_class}
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def create
@@ -145,6 +172,16 @@ def create
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end
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147174
it 'does not register an offense when using `flash` before `redirect_back`' do
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expect_no_offenses(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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flash[:alert] = "msg" if condition
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redirect_back fallback_location: root_path
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end
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end
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RUBY
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expect_no_offenses(<<~RUBY)
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class HomeController < #{parent_class}
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def create
@@ -158,7 +195,7 @@ def create
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RUBY
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end
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161-
it 'registers an offense when using `flash` in multiline `if` branch before `render_to`' do
198+
it 'registers an offense when using `flash` in multiline `if` branch before `render`' do
162199
expect_offense(<<~RUBY)
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class HomeController < #{parent_class}
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def create
@@ -185,6 +222,29 @@ def create
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end
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end
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RUBY
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expect_offense(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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if condition
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do_something
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flash[:alert] = "msg"
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^^^^^ Use `flash.now` before `render`.
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end
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end
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end
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RUBY
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expect_correction(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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if condition
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do_something
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flash.now[:alert] = "msg"
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end
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end
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end
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RUBY
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end
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it 'does not register an offense when using `flash` in multiline `if` branch before `redirect_to`' do
@@ -217,6 +277,81 @@ def create
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end
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end
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RUBY
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expect_no_offenses(<<~RUBY)
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class HomeController < #{parent_class}
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def create
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if condition
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flash[:alert] = "msg"
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redirect_to :index
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return
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end
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end
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end
292+
RUBY
293+
end
294+
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it 'registers an offense when using `flash` in multiline `rescue` branch before `render`' do
296+
expect_offense(<<~RUBY)
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class HomeController < #{parent_class}
298+
def create
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begin
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do_something
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flash[:alert] = "msg in begin"
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^^^^^ Use `flash.now` before `render`.
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rescue
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flash[:alert] = "msg in rescue"
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^^^^^ Use `flash.now` before `render`.
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end
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render :index
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end
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end
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RUBY
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expect_correction(<<~RUBY)
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class HomeController < #{parent_class}
315+
def create
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begin
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do_something
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flash.now[:alert] = "msg in begin"
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rescue
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flash.now[:alert] = "msg in rescue"
321+
end
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render :index
324+
end
325+
end
326+
RUBY
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328+
expect_offense(<<~RUBY)
329+
class HomeController < #{parent_class}
330+
def create
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begin
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do_something
333+
flash[:alert] = "msg in begin"
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^^^^^ Use `flash.now` before `render`.
335+
rescue
336+
flash[:alert] = "msg in rescue"
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^^^^^ Use `flash.now` before `render`.
338+
end
339+
end
340+
end
341+
RUBY
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343+
expect_correction(<<~RUBY)
344+
class HomeController < #{parent_class}
345+
def create
346+
begin
347+
do_something
348+
flash.now[:alert] = "msg in begin"
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rescue
350+
flash.now[:alert] = "msg in rescue"
351+
end
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end
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end
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RUBY
220355
end
221356

222357
it 'does not register an offense when using `flash` in multiline `rescue` branch before `redirect_to`' do
@@ -235,6 +370,48 @@ def create
235370
end
236371
RUBY
237372
end
373+
374+
it 'does not register an offense when using `flash` before `redirect_to` in `rescue` branch' do
375+
expect_no_offenses(<<~RUBY)
376+
class HomeController < #{parent_class}
377+
def create
378+
begin
379+
do_something
380+
flash[:alert] = "msg in begin"
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redirect_to :index
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383+
return
384+
rescue
385+
flash[:alert] = "msg in rescue"
386+
redirect_to :index
387+
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return
389+
end
390+
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render :index
392+
end
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end
394+
RUBY
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expect_no_offenses(<<~RUBY)
397+
class HomeController < #{parent_class}
398+
def create
399+
begin
400+
do_something
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flash[:alert] = "msg in begin"
402+
redirect_to :index
403+
404+
return
405+
rescue
406+
flash[:alert] = "msg in rescue"
407+
redirect_to :index
408+
409+
return
410+
end
411+
end
412+
end
413+
RUBY
414+
end
238415
end
239416
end
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