Refactor inject

lib/ransack/adapters/active_record/3.0/compat.rb

@@ -3,13 +3,7 @@ if Arel::Nodes::And < Arel::Nodes::Binary
   class Ransack::Visitor
     def visit_Ransack_Nodes_And(object)
       nodes = object.values.map { |o| accept(o) }.compact
-      return nil unless nodes.size > 0
-
-      if nodes.size > 1
-        nodes.inject(&:and)
-      else
-        nodes.first
-      end
+      nodes.inject(&:and)
     end
   end
 end

lib/ransack/adapters/mongoid/ransack/nodes/condition.rb

@@ -10,15 +10,10 @@ module Ransack
           )
         end
 
-        if predicates.size > 1
-          case combinator
-          when 'and'
-            Arel::Nodes::Grouping.new(Arel::Nodes::And.new(predicates))
-          when 'or'
-            predicates.inject(&:or)
-          end
+        if predicates.size > 1 && combinator == 'and'
+          Arel::Nodes::Grouping.new(Arel::Nodes::And.new(predicates))
         else
-          predicates.first
+          predicates.inject(&:or)
         end
       end
 

lib/ransack/adapters/mongoid/ransack/visitor.rb

@@ -2,13 +2,7 @@ module Ransack
   class Visitor
     def visit_and(object)
       nodes = object.values.map { |o| accept(o) }.compact
-      return nil unless nodes.size > 0
-
-      if nodes.size > 1
-        nodes.inject(&:and)
-      else
-        nodes.first
-      end
+      nodes.inject(&:and)
     end
 
     def quoted?(object)

lib/ransack/visitor.rb

@@ -31,13 +31,7 @@ module Ransack
 
     def visit_or(object)
       nodes = object.values.map { |o| accept(o) }.compact
-      return nil unless nodes.size > 0
-
-      if nodes.size > 1
-        nodes.inject(&:or)
-      else
-        nodes.first
-      end
+      nodes.inject(&:or)
     end
 
     def quoted?(object)