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Run a callback only if an attribute has changed in Rails

... # ... end end The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faac5b4a3c81 Here is a blog post on these changes: https://www.ombulabs.com/blog/rails/upgrades/active-record-5-1-api-changes.html Here is the summary I made...
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Can I checkout github wikis like a git repository?

... You can now! git clone https://github.com/user/project.wiki.git or if you use ssh git clone git@github.com:username/project.wiki.git share | i...
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Find an element in DOM based on an attribute value

...torAll so you can do: document.querySelectorAll('[data-foo="value"]'); https://developer.mozilla.org/en-US/docs/Web/API/Document.querySelectorAll Details about browser compatibility: http://quirksmode.org/dom/core/#t14 http://caniuse.com/queryselector You can use jQuery to support obsolete ...
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Publish to S3 using Git?

... git-s3 - https://github.com/schickling/git-s3 You just have to run git-s3 deploy It comes with all benefits of a git repo and uploades/deletes just the files you've changed. Note: Deploys aren't implicit via git push but you could a...
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What do the different readystates in XMLHttpRequest mean, and how can I use them?

...nt 3 The request is in process 4 The request is complete (from https://www.w3schools.com/js/js_ajax_http_response.asp) In practice you almost never use any of them except for 4. Some XMLHttpRequest implementations may let you see partially received responses in responseText when readyS...
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Update built-in vim on Mac OS X

...al/bin $ # Download, compile, and install the latest Vim $ cd ~ $ hg clone https://bitbucket.org/vim-mirror/vim or git clone https://github.com/vim/vim.git $ $ cd vim $ ./configure --prefix=/opt/local $ make $ sudo make install $ # Add the binary to your path, ahead of /usr/bin $ echo 'PATH=/opt/lo...
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git pull VS git fetch Vs git rebase

...rge to merge the retrieved branch heads into the current branch" (Ref: https://git-scm.com/docs/git-pull) For your second statement/question: 'But what is the difference between git pull VS git fetch + git rebase' Again, from same source: git pull --rebase "With --rebase, it runs gi...
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Shrink a YouTube video to responsive width

...); Simple to use with only embed: <iframe width="16" height="9" src="https://www.youtube.com/embed/wH7k5CFp4hI" frameborder="0" allowfullscreen></iframe> Or with responsive style framework like Bootstrap. <div class="row"> <div class="col-sm-6"> Stroke Awareness ...
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Citing the author of a blockquote using Markdown syntax

... Adding another sample here for reference. Generated from https://en.wikipedia.org/wiki/Special:CiteThisPage > Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: requirements are turned into very speci...
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How do I update an NPM module that I published?

...npm version <update_type> Run npm publish. Go to your package page (https://npmjs.com/package/) to check that the package version has been updated. share | improve this answer | ...