Drop support for activerecord older than 5.2.4

.travis.yml

@@ -19,9 +19,9 @@ env:
   - RAILS=5-2-stable DB=mysql
   - RAILS=5-2-stable DB=postgres
 
-  - RAILS=v5.2.3 DB=sqlite3
-  - RAILS=v5.2.3 DB=mysql
-  - RAILS=v5.2.3 DB=postgres
+  - RAILS=v5.2.4 DB=sqlite3
+  - RAILS=v5.2.4 DB=mysql
+  - RAILS=v5.2.4 DB=postgres
 
 before_script:
   - if [ "$DB" = "mysql" ];

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 * Fix for ActiveRecord 5.2.4 (note security fix in 5.2.4.2 for ActiveView's escape_javascript CVE-2020-5267 for all earlier versions)
 
+* Drop support for ActiveRecord older than 5.2.4.
+  PR [1166](https://github.com/activerecord-hackery/ransack/pull/1166)
+
 ## 2.3.2 - 2020-01-11
 
 * Breakfix to bump Polyamorous

lib/polyamorous/activerecord_5.2_ruby_2/reflection.rb

@@ -1,20 +1,10 @@
 module Polyamorous
   module ReflectionExtensions
-    if ActiveRecord.version > ::Gem::Version.new('5.2.3')
-      def join_scope(table, foreign_table, foreign_klass)
-        if respond_to?(:polymorphic?) && polymorphic?
-          super.where!(foreign_table[foreign_type].eq(klass.name))
-        else
-          super
-        end
-      end
-    else
-      def build_join_constraint(table, foreign_table)
-        if polymorphic?
-          super.and(foreign_table[foreign_type].eq(klass.name))
-        else
-          super
-        end
+    def join_scope(table, foreign_table, foreign_klass)
+      if respond_to?(:polymorphic?) && polymorphic?
+        super.where!(foreign_table[foreign_type].eq(klass.name))
+      else
+        super
       end
     end
   end

ransack.gemspec

@@ -14,8 +14,8 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '>= 2.3'
   s.license     = 'MIT'
 
-  s.add_dependency 'activerecord', '>= 5.2.1'
-  s.add_dependency 'activesupport', '>= 5.2.1'
+  s.add_dependency 'activerecord', '>= 5.2.4'
+  s.add_dependency 'activesupport', '>= 5.2.4'
   s.add_dependency 'i18n'
 
   s.files         = `git ls-files`.split("\n")