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The `posts` relation on `Topic` is not ordered. Using `Topic.posts.first` is basically the same as asking for a random post, it will depend on DB order. This breaks on Topic merge and split for example. Additionally, a huge problem with that is that it forces active record down a slow path. `Topic.posts.first` is extremely slow on giant topics, since it has no default ordering it appears AR materializes the entire set prior to doing `first`. This commit also illustrates the importance of testing, initially I only fixed the second instance of the problem in `post_validator.rb` but testing revealed that the problem was repeated at the top of the file. Longer term we should consider a larger change of default ordering the posts relations so people do not fall down this trap anymore. |
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| .. | ||
| allow_user_locale_enabled_validator.rb | ||
| allowed_ip_address_validator.rb | ||
| alternative_reply_by_email_addresses_validator.rb | ||
| censored_words_validator.rb | ||
| email_setting_validator.rb | ||
| email_validator.rb | ||
| enable_local_logins_via_email_validator.rb | ||
| enable_private_email_messages_validator.rb | ||
| enable_sso_validator.rb | ||
| integer_setting_validator.rb | ||
| ip_address_format_validator.rb | ||
| max_emojis_validator.rb | ||
| max_username_length_validator.rb | ||
| min_username_length_validator.rb | ||
| password_validator.rb | ||
| pop3_polling_enabled_setting_validator.rb | ||
| post_validator.rb | ||
| quality_title_validator.rb | ||
| regex_presence_validator.rb | ||
| regex_setting_validation.rb | ||
| regex_setting_validator.rb | ||
| reply_by_email_address_validator.rb | ||
| reply_by_email_enabled_validator.rb | ||
| sso_overrides_email_validator.rb | ||
| string_setting_validator.rb | ||
| stripped_length_validator.rb | ||
| topic_title_length_validator.rb | ||
| unique_among_validator.rb | ||
| upload_url_validator.rb | ||
| upload_validator.rb | ||
| url_validator.rb | ||
| user_full_name_validator.rb | ||
| username_setting_validator.rb | ||