Fixes queries using limits and punctuation in order, removes order("col1, col2") usage in favor of order(["col1", "col2"})

[#4597 state:committed]

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -932,12 +932,12 @@ module ActiveRecord
       # requires that the ORDER BY include the distinct column.
       #
       #   distinct("posts.id", "posts.created_at desc")
-      def distinct(columns, order_by) #:nodoc:
-        return "DISTINCT #{columns}" if order_by.blank?
+      def distinct(columns, orders) #:nodoc:
+        return "DISTINCT #{columns}" if orders.empty?
 
         # Construct a clean list of column names from the ORDER BY clause, removing
         # any ASC/DESC modifiers
-        order_columns = order_by.split(',').collect { |s| s.split.first }
+        order_columns = orders.collect { |s| s.split.first }
         order_columns.delete_if { |c| c.blank? }
         order_columns = order_columns.zip((0...order_columns.size).to_a).map { |s,i| "#{s} AS alias_#{i}" }
 

activerecord/lib/active_record/relation/finder_methods.rb

@@ -222,7 +222,7 @@ module ActiveRecord
     end
 
     def construct_limited_ids_condition(relation)
-      orders = relation.order_values.join(", ")
+      orders = relation.order_values
       values = @klass.connection.distinct("#{@klass.connection.quote_table_name @klass.table_name}.#{@klass.primary_key}", orders)
 
       ids_array = relation.select(values).collect {|row| row[@klass.primary_key]}

activerecord/test/cases/associations/cascaded_eager_loading_test.rb

@@ -137,7 +137,7 @@ class CascadedEagerLoadingTest < ActiveRecord::TestCase
   end
 
   def test_eager_association_loading_with_multiple_stis_and_order
-    author = Author.find(:first, :include => { :posts => [ :special_comments , :very_special_comment ] }, :order => 'authors.name, comments.body, very_special_comments_posts.body', :conditions => 'posts.id = 4')
+    author = Author.find(:first, :include => { :posts => [ :special_comments , :very_special_comment ] }, :order => ['authors.name', 'comments.body', 'very_special_comments_posts.body'], :conditions => 'posts.id = 4')
     assert_equal authors(:david), author
     assert_no_queries do
       author.posts.first.special_comments

activerecord/test/cases/associations/eager_test.rb

@@ -584,8 +584,8 @@ class EagerAssociationTest < ActiveRecord::TestCase
   end
 
   def test_limited_eager_with_multiple_order_columns
-    assert_equal posts(:thinking, :sti_comments), Post.find(:all, :include => [:author, :comments], :conditions => "authors.name = 'David'", :order => 'UPPER(posts.title), posts.id', :limit => 2, :offset => 1)
-    assert_equal posts(:sti_post_and_comments, :sti_comments), Post.find(:all, :include => [:author, :comments], :conditions => "authors.name = 'David'", :order => 'UPPER(posts.title) DESC, posts.id', :limit => 2, :offset => 1)
+    assert_equal posts(:thinking, :sti_comments), Post.find(:all, :include => [:author, :comments], :conditions => "authors.name = 'David'", :order => ['UPPER(posts.title)', 'posts.id'], :limit => 2, :offset => 1)
+    assert_equal posts(:sti_post_and_comments, :sti_comments), Post.find(:all, :include => [:author, :comments], :conditions => "authors.name = 'David'", :order => ['UPPER(posts.title) DESC', 'posts.id'], :limit => 2, :offset => 1)
   end
 
   def test_limited_eager_with_numeric_in_association

activerecord/test/cases/relations_test.rb

@@ -1,4 +1,5 @@
 require "cases/helper"
+require 'models/tag'
 require 'models/tagging'
 require 'models/post'
 require 'models/topic'
@@ -17,7 +18,7 @@ require 'models/tyre'
 
 class RelationTest < ActiveRecord::TestCase
   fixtures :authors, :topics, :entrants, :developers, :companies, :developers_projects, :accounts, :categories, :categorizations, :posts, :comments,
-    :taggings, :cars
+    :tags, :taggings, :cars
 
   def test_bind_values
     relation = Post.scoped
@@ -144,6 +145,26 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal entrants(:first).name, entrants.first.name
   end
 
+  def test_finding_with_complex_order_and_limit
+    if current_adapter?(:SQLite3Adapter)
+      tags = Tag.includes(:taggings).order("MIN(1,2)").limit(1).to_a
+    else
+      tags = Tag.includes(:taggings).order("LEAST(1,COS(1)*COS(-1)*COS(RADIANS(taggings.super_tag_id)))").limit(1).to_a
+    end
+
+    assert_equal 1, tags.length
+  end
+
+  def test_finding_with_complex_order
+    if current_adapter?(:SQLite3Adapter)
+      tags = Tag.includes(:taggings).order("MIN(1,2)").to_a
+    else
+      tags = Tag.includes(:taggings).order("LEAST(1,COS(1)*COS(-1)*COS(RADIANS(taggings.super_tag_id)))").to_a
+    end
+
+    assert_equal 2, tags.length
+  end
+
   def test_finding_with_order_limit_and_offset
     entrants = Entrant.order("id ASC").limit(2).offset(1)