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-rw-r--r--activerecord/lib/active_record/integration.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/integration.rb b/activerecord/lib/active_record/integration.rb
index f8aa0c55db..27576b1e61 100644
--- a/activerecord/lib/active_record/integration.rb
+++ b/activerecord/lib/active_record/integration.rb
@@ -81,6 +81,9 @@ module ActiveRecord
# user.id # => 123
# user_path(user) # => "/users/123-fancy-pants"
#
+ # Values longer than 20 characters will be truncated. The value
+ # is truncated word by word.
+ #
# user = User.find_by(name: 'David HeinemeierHansson')
# user.id # => 125
# user_path(user) # => "/users/125-david"