Hi, I&#x27;m the author of the pull request. The pull request got stuck due to an issue with dynamic injection of local variables into view templates. (Explained more in the Aaron Patterson&#x27;s RailsConf keynote[1]). We were planning to solve this issue before (potentially) merging the feature.<p>At the moment, it looks like the issue is solvable, and I have code that seems to solve it but still needs some refinement before I can submit a pull request about it.<p>I don&#x27;t know what the Rails core team is planning about the feature, but considering how complex the whole thing is and how much there&#x27;s still left to do, I&#x27;d guess that it won&#x27;t make it to 5.0.<p>[1]: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=B3gYklsN9uc&amp;feature=youtu.be&amp;t=1052" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=B3gYklsN9uc&amp;feature=youtu.be...</a>