1 files changed, 39 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/eager_test.rb b/activerecord/test/cases/associations/eager_test.rb
index a1fba8dc66..79b3b4a6ad 100644
--- a/activerecord/test/cases/associations/eager_test.rb
+++ b/activerecord/test/cases/associations/eager_test.rb
@@ -18,6 +18,7 @@ require "models/job"
 require "models/subscriber"
 require "models/subscription"
 require "models/book"
+require "models/citation"
 require "models/developer"
 require "models/computer"
 require "models/project"
@@ -29,6 +30,18 @@ require "models/sponsor"
 require "models/mentor"
 require "models/contract"
 
+class EagerLoadingTooManyIdsTest < ActiveRecord::TestCase
+  fixtures :citations
+
+  def test_preloading_too_many_ids
+    assert_equal Citation.count, Citation.preload(:citations).to_a.size
+  end
+
+  def test_eager_loading_too_may_ids
+    assert_equal Citation.count, Citation.eager_load(:citations).offset(0).size
+  end
+end
+
 class EagerAssociationTest < ActiveRecord::TestCase
   fixtures :posts, :comments, :authors, :essays, :author_addresses, :categories, :categories_posts,
             :companies, :accounts, :tags, :taggings, :people, :readers, :categorizations,
@@ -1605,6 +1618,32 @@ class EagerAssociationTest < ActiveRecord::TestCase
     end
   end
 
+  # Associations::Preloader#preloaders_on works with hash-like objects
+  test "preloading works with an object that responds to :to_hash" do
+    CustomHash = Class.new(Hash)
+
+    assert_nothing_raised do
+      Post.preload(CustomHash.new(comments: [{ author: :essays }])).first
+    end
+  end
+
+  # Associations::Preloader#preloaders_on works with string-like objects
+  test "preloading works with an object that responds to :to_str" do
+    CustomString = Class.new(String)
+
+    assert_nothing_raised do
+      Post.preload(CustomString.new("comments")).first
+    end
+  end
+
+  # Associations::Preloader#preloaders_on does not work with ranges
+  test "preloading fails when Range is passed" do
+    exception = assert_raises(ArgumentError) do
+      Post.preload(1..10).first
+    end
+    assert_equal("1..10 was not recognized for preload", exception.message)
+  end
+
   private
     def find_all_ordered(klass, include = nil)
       klass.order("#{klass.table_name}.#{klass.primary_key}").includes(include).to_a