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-rw-r--r--activerecord/lib/active_record/relation/spawn_methods.rb4
-rw-r--r--activerecord/test/cases/relation_test.rb11
2 files changed, 10 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/relation/spawn_methods.rb b/activerecord/lib/active_record/relation/spawn_methods.rb
index ee509b98d4..67d7f83cb4 100644
--- a/activerecord/lib/active_record/relation/spawn_methods.rb
+++ b/activerecord/lib/active_record/relation/spawn_methods.rb
@@ -40,10 +40,12 @@ module ActiveRecord
def merge!(other) # :nodoc:
if other.is_a?(Hash)
Relation::HashMerger.new(self, other).merge
+ elsif other.is_a?(Relation)
+ Relation::Merger.new(self, other).merge
elsif other.respond_to?(:to_proc)
instance_exec(&other)
else
- Relation::Merger.new(self, other).merge
+ raise ArgumentError, "#{other.inspect} is not an ActiveRecord::Relation"
end
end
diff --git a/activerecord/test/cases/relation_test.rb b/activerecord/test/cases/relation_test.rb
index b58052a962..f46d414b95 100644
--- a/activerecord/test/cases/relation_test.rb
+++ b/activerecord/test/cases/relation_test.rb
@@ -24,10 +24,6 @@ module ActiveRecord
def self.sanitize_sql_for_order(sql)
sql
end
-
- def self.arel_table
- Post.arel_table
- end
end
def test_construction
@@ -239,6 +235,13 @@ module ActiveRecord
assert_equal 3, relation.where(id: post.id).pluck(:id).size
end
+ def test_merge_raises_with_invalid_argument
+ assert_raises ArgumentError do
+ relation = Relation.new(FakeKlass, :b, nil)
+ relation.merge(true)
+ end
+ end
+
def test_respond_to_for_non_selected_element
post = Post.select(:title).first
assert_equal false, post.respond_to?(:body), "post should not respond_to?(:body) since invoking it raises exception"