Use uniq
before pluck
. Open
options_for_select(Namespace.pluck(:short_name).uniq),
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- Exclude checks
Prefer the use of uniq (or distinct), before pluck instead of after.
The use of uniq before pluck is preferred because it executes within the database.
This cop has two different enforcement modes. When the EnforcedStyle is conservative (the default) then only calls to pluck on a constant (i.e. a model class) before uniq are added as offenses.
When the EnforcedStyle is aggressive then all calls to pluck before uniq are added as offenses. This may lead to false positives as the cop cannot distinguish between calls to pluck on an ActiveRecord::Relation vs a call to pluck on an ActiveRecord::Associations::CollectionProxy.
Autocorrect is disabled by default for this cop since it may generate false positives.
Example: EnforcedStyle: conservative (default)
# bad
Model.pluck(:id).uniq
# good
Model.uniq.pluck(:id)
Example: EnforcedStyle: aggressive
# bad
# this will return a Relation that pluck is called on
Model.where(cond: true).pluck(:id).uniq
# bad
# an association on an instance will return a CollectionProxy
instance.assoc.pluck(:id).uniq
# bad
Model.pluck(:id).uniq
# good
Model.uniq.pluck(:id)
Tagging a string as html safe may be a security risk. Open
r.join('<br/>').html_safe
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- Exclude checks
This cop checks for the use of output safety calls like html_safe
,
raw
, and safe_concat
. These methods do not escape content. They
simply return a SafeBuffer containing the content as is. Instead,
use safe_join
to join content and escape it and concat to
concatenate content and escape it, ensuring its safety.
Example:
user_content = "hi"
# bad
"#{user_content}
".html_safe
# => ActiveSupport::SafeBuffer "hi
"
# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "<b>hi</b>
"
# bad
out = ""
out << "#{user_content} "
out << "#{user_content} "
out.html_safe
# => ActiveSupport::SafeBuffer "hi
hi "
# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
# "<b>hi</b>
<b>hi</b> "
# bad
out = "trusted content
".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "trusted_content
hi"
# good
out = "trusted content
".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
# "trusted_content
<b>hi</b>"
# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>
# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"
# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
# "<b>hi</b> <span><b>hi</b></span>"
Use namespace.institution.present?
instead of !namespace.institution.blank?
. Open
if !namespace.institution.blank?
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This cop checks for code that can be written with simpler conditionals
using Object#present?
defined by Active Support.
Interaction with Style/UnlessElse
:
The configuration of NotBlank
will not produce an offense in the
context of unless else
if Style/UnlessElse
is inabled. This is
to prevent interference between the auto-correction of the two cops.
Example: NotNilAndNotEmpty: true (default)
# Converts usages of `!nil? && !empty?` to `present?`
# bad
!foo.nil? && !foo.empty?
# bad
foo != nil && !foo.empty?
# good
foo.present?
Example: NotBlank: true (default)
# Converts usages of `!blank?` to `present?`
# bad
!foo.blank?
# bad
not foo.blank?
# good
foo.present?
Example: UnlessBlank: true (default)
# Converts usages of `unless blank?` to `if present?`
# bad
something unless foo.blank?
# good
something if foo.present?
Tagging a string as html safe may be a security risk. Open
link_to(namespace_tag(namespace).html_safe, namespace)
- Read upRead up
- Exclude checks
This cop checks for the use of output safety calls like html_safe
,
raw
, and safe_concat
. These methods do not escape content. They
simply return a SafeBuffer containing the content as is. Instead,
use safe_join
to join content and escape it and concat to
concatenate content and escape it, ensuring its safety.
Example:
user_content = "hi"
# bad
"#{user_content}
".html_safe
# => ActiveSupport::SafeBuffer "hi
"
# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "<b>hi</b>
"
# bad
out = ""
out << "#{user_content} "
out << "#{user_content} "
out.html_safe
# => ActiveSupport::SafeBuffer "hi
hi "
# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
# "<b>hi</b>
<b>hi</b> "
# bad
out = "trusted content
".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "trusted_content
hi"
# good
out = "trusted content
".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
# "trusted_content
<b>hi</b>"
# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>
# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"
# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
# "<b>hi</b> <span><b>hi</b></span>"