AR::UnknownAttributeError should include the class name of a record

This would be helpful if 2 models have an attribute that has a similar
name to the other. e.g:

before:

    User.new(name: "Yuki Nishijima", projects_attributes: [name: "kaminari"])
    # => ActiveRecord::UnknownAttributeError: unknown attribute: name

after:

    User.new(name: "Yuki Nishijima", projects_attributes: [name: "kaminari"])
    # => ActiveRecord::UnknownAttributeError: unknown attribute on User: name

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index b12d048169..a1bef4aa93 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,13 @@
+*   `AR::UnknownAttributeError` now includes the class name of a record.
+
+    This would be helpful if 2 models have an attribute that has a similar
+    name to the other one. e.g.:
+
+        User.new(name: "Yuki Nishijima", project_attributes: {name: "kaminari"})
+        # => ActiveRecord::UnknownAttributeError: unknown attribute on User: name
+
+    *Yuki Nishijima*
+
 *   Fix regression causing `after_create` callbacks to run before associated
     records are autosaved.