Merge pull request rails#25577 from sgrif/sg-backport-3055f59e0ad7d5f0eee24c22a45fbae4a40b056e

Backport 3055f59

Author: rafaelfranca

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Inspecting an object with an associated array of over 10 elements no longer
+    truncates the array, preventing `inspect` from looping infinitely in some
+    cases.
+
+    *Kevin McPhillips*
+
 *   Ensure hashes can be assigned to attributes created using `composed_of`.
     Fixes #25210.
 

activerecord/lib/active_record/attribute_methods.rb

@@ -287,9 +287,8 @@ def attributes
     # Returns an <tt>#inspect</tt>-like string for the value of the
     # attribute +attr_name+. String attributes are truncated up to 50
     # characters, Date and Time attributes are returned in the
-    # <tt>:db</tt> format, Array attributes are truncated up to 10 values.
-    # Other attributes return the value of <tt>#inspect</tt> without
-    # modification.
+    # <tt>:db</tt> format. Other attributes return the value of
+    # <tt>#inspect</tt> without modification.
     #
     #   person = Person.create!(name: 'David Heinemeier Hansson ' * 3)
     #
@@ -300,17 +299,14 @@ def attributes
     #   # => "\"2012-10-22 00:15:07\""
     #
     #   person.attribute_for_inspect(:tag_ids)
-    #   # => "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...]"
+    #   # => "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]"
     def attribute_for_inspect(attr_name)
       value = read_attribute(attr_name)
 
       if value.is_a?(String) && value.length > 50
         "#{value[0, 50]}...".inspect
       elsif value.is_a?(Date) || value.is_a?(Time)
         %("#{value.to_s(:db)}")
-      elsif value.is_a?(Array) && value.size > 10
-        inspected = value.first(10).inspect
-        %(#{inspected[0...-1]}, ...])
       else
         value.inspect
       end

activerecord/test/cases/adapters/postgresql/array_test.rb

@@ -183,8 +183,13 @@ def test_insert_fixture
   end
 
   def test_attribute_for_inspect_for_array_field
+    record = PgArray.new { |a| a.ratings = (1..10).to_a }
+    assert_equal("[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]", record.attribute_for_inspect(:ratings))
+  end
+
+  def test_attribute_for_inspect_for_array_field_for_large_array
     record = PgArray.new { |a| a.ratings = (1..11).to_a }
-    assert_equal("[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...]", record.attribute_for_inspect(:ratings))
+    assert_equal("[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]", record.attribute_for_inspect(:ratings))
   end
 
   def test_escaping

activerecord/test/cases/attribute_methods_test.rb

@@ -28,14 +28,33 @@ def setup
     ActiveRecord::Base.send(:attribute_method_matchers).concat(@old_matchers)
   end
 
-  def test_attribute_for_inspect
+  def test_attribute_for_inspect_string
     t = topics(:first)
     t.title = "The First Topic Now Has A Title With\nNewlines And More Than 50 Characters"
 
-    assert_equal %("#{t.written_on.to_s(:db)}"), t.attribute_for_inspect(:written_on)
     assert_equal '"The First Topic Now Has A Title With\nNewlines And ..."', t.attribute_for_inspect(:title)
   end
 
+  def test_attribute_for_inspect_date
+    t = topics(:first)
+
+    assert_equal %("#{t.written_on.to_s(:db)}"), t.attribute_for_inspect(:written_on)
+  end
+
+  def test_attribute_for_inspect_array
+    t = topics(:first)
+    t.content = [Object.new]
+
+    assert_match %r(\[#<Object:0x[0-9a-f]+>\]), t.attribute_for_inspect(:content)
+  end
+
+  def test_attribute_for_inspect_long_array
+    t = topics(:first)
+    t.content = (1..11).to_a
+
+    assert_equal "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]", t.attribute_for_inspect(:content)
+  end
+
   def test_attribute_present
     t = Topic.new
     t.title = "hello there!"