rails changelog

This commit introduces a modification to the autosaving behavior of collection associations in the application. Specifically, it ensures that when autosaving occurs, any targets that have already been persisted are skipped, preventing unnecessary database operations and improving efficiency. This change aims to optimize performance by reducing redundant saves for objects that do not require updates.

Overall, the update enhances the handling of collection associations by streamlining the autosave process, which can lead to better resource management and faster response times during data manipulation tasks. This adjustment is particularly beneficial in scenarios where large collections are involved, as it minimizes the overhead associated with saving unchanged records.

Files changed

This commit focuses on optimizing the performance of model instantiation in ActiveRecord by eliminating memory allocations during calls to Model.respond_to?. Profiling revealed that these allocations contributed to the overhead of initializing models, such as when calling Post.new. By modifying the implementation of respond_to?, the patch aims to reduce initialization costs and improve overall performance for model queries.

The benchmark tests conducted before and after the patch demonstrated a reduction in allocations per model instantiation and a complete elimination of allocations during respond_to? calls. Before the patch, creating a new Post model allocated an average of 9 objects, while respond_to? calls allocated 2 objects. After the changes, these numbers decreased to 7 and 0, respectively, showcasing a significant enhancement in efficiency. The commit was co-authored by Eileen M. Uchitelle.

Files changed

The commit removes documentation for the constants ENV_MATCH, NULL_ENV_FILTER, and NULL_PARAM_FILTER in the FilterParameters module of ActionDispatch in Ruby on Rails. This decision likely reflects a move to streamline the documentation by eliminating references to constants that may no longer be relevant or necessary for users.

By making these constants undocumented, the commit aims to reduce confusion and improve the clarity of the API, ensuring that developers focus on the most pertinent and actively maintained features. This change is part of ongoing efforts to keep the Rails documentation clean and up-to-date.

Files changed

This commit addresses an issue where query values in ActiveRecord are unnecessarily duplicated even when they are frozen, specifically when the frozen_string_literal feature is enabled in Ruby. The commit highlights that strings like "foo" and "bar" in a default scope defined in a model would still be duplicated, which is inefficient.

The change aims to prevent the duplication of frozen values in all where calls, not limited to just default scopes. By implementing this fix, the commit enhances performance and memory efficiency by recognizing and preserving the immutability of frozen string literals, which are increasingly utilized in Ruby applications.

Files changed

This commit introduces a modification to the node plaintext conversion process by excluding the content of script and style tags. The rationale behind this change is to ensure that any JavaScript or CSS code present within these tags does not interfere with the plaintext output, thereby enhancing the clarity and relevance of the converted text.

As a result of this update, when converting a node to plaintext, any content encapsulated within script or style elements will be ignored, leading to a cleaner and more focused representation of the node's textual content. This change aims to improve the usability of the plaintext output for end-users or further processing tasks.

Files changed

This commit addresses an issue with the ActionDispatch::Request::HTTP_METHOD_LOOKUP being adversely affected by inflections introduced by external gems. When a gem adds custom inflections before the action_dispatch/http/request module is loaded, it can lead to incorrect transformations of HTTP method names. For instance, if a gem defines "OS" as an acronym, the method #underscore may incorrectly convert "POST" to :p_os_t, resulting in invalid method identifiers.

To resolve this issue, the commit implements changes that ensure the integrity of HTTP method lookups by isolating the inflection logic from external gem modifications. This ensures that the core functionality of handling HTTP methods remains consistent and reliable, regardless of any inflections introduced by other libraries in the application.

Files changed

This commit addresses an issue with the default Docker build for Ruby images, specifically related to the removal of the libyaml-dev package, which is necessary for installing and building the psych gem. The change was prompted by a recent update in the Ruby Docker images that omitted this essential package.

In the modified file railties/lib/rails/generators/app_base.rb, the code for defining the dockerfile_build_packages has been updated to include libyaml-dev in the list of essential packages. This ensures that the required dependencies for building Ruby applications remain intact, thereby preventing potential build failures related to the psych gem.

Files changed

• railties/lib/rails/generators/app_base.rb