[Fix rubocop#365] Mark Rails/SquishedSQLHeredocs unsafe for autocor…

…rection

Closes rubocop#365

CHANGELOG.md

@@ -17,6 +17,7 @@
 ### Changes
 
 * [#383](https://github.com/rubocop-hq/rubocop-rails/pull/383): Require RuboCop 0.90 or higher. ([@koic][])
+* [#365](https://github.com/rubocop-hq/rubocop-rails/issues/365): Mark `Rails/SquishedSQLHeredocs` unsafe for autocorrection. ([@tejasbubane][])
 
 ## 2.8.1 (2020-09-16)
 

config/default.yml

@@ -668,6 +668,10 @@ Rails/SquishedSQLHeredocs:
   StyleGuide: 'https://rails.rubystyle.guide/#squished-heredocs'
   Enabled: 'pending'
   VersionAdded: '2.8'
+  VersionChanged: '2.9'
+  # Some SQL syntax (e.g. PostgreSQL comments and functions) requires newlines
+  # to be preserved in order to work, thus auto-correction is not safe.
+  SafeAutoCorrect: false
 
 Rails/TimeZone:
   Description: 'Checks the correct usage of time zone aware methods.'

docs/modules/ROOT/pages/cops_rails.adoc

@@ -4056,13 +4056,16 @@ user.touch
 
 | Pending
 | Yes
-| Yes
+| Yes (Unsafe)
 | 2.8
-| -
+| 2.9
 |===
 
 Checks SQL heredocs to use `.squish`.
 
+Some SQL syntax (e.g. PostgreSQL comments and functions) requires newlines
+to be preserved in order to work, thus auto-correction for this cop is not safe.
+
 === Examples
 
 [source,ruby]

lib/rubocop/cop/rails/squished_sql_heredocs.rb

@@ -37,6 +37,9 @@ module Rails
       #       WHERE post_id = 1
       #   SQL
       #
+      # Some SQL syntax (e.g. PostgreSQL comments and functions) requires newlines
+      # to be preserved in order to work, thus auto-correction for this cop is not safe.
+      #
       class SquishedSQLHeredocs < Base
         include Heredoc
         extend AutoCorrector