...methods usually don't print background colors. In most cases this is the desired behavior, because you don't want to spend tons of ink printing the background of a...
If you ever need to restore exact records from one database to another, Marshal might come in handy. Marshal.dump is...
Besides Plotting graphs in Ruby with Gruff, which comes handy for many uses cases, you sometimes might need configuration for more advanced plots, e.g. for academic concerns. Then using Gnuplot...
...where each array holds the data for x-, y- or z-axis. The major benefit of numo-gnuplot is that it supports advanced numpy like array operations, like multi array...
When changing code in mailers, updating the corresponding mailer preview can be forgotten very easily. Mailer previews can be tested...
...Rails has a method ActiveRecord::Relation#merge that can merge ActiveRecord scopes. However, its behavior has never been clear, and in Rails 7 it still discards conditions on the same...
...column by the last condition. We discourage using #merge!) The best way to merge ActiveRecord scopes is using a subquery: scope_a.where(id: scope_b) It is a little less concise...
The robots.txt file and HTML tag can be used to control the behavior of search engine crawlers. Both have different effects. robots.txt Marking a URL path as "disallowed" in robots.txt...
...follow redirects to get the desired response. This is supported but not the default behavior. You can do so by using the .follow method. This follows redirects for the following...
Creating records in specs can be so fast that two records created instantly after one another might have the same...
...Middleman brings Haml, Sass, helpers etc. However, it can be configured to do even better. This card is a list of improvement hints for a Rails developer. Gemfile
...helpers in a helpers {...
...} block. However, this does not scale very well. You're best off creating a /helpers directory and putting helper files there just like you know it...
There is a common view that extracting text from a PDF document should not be too difficult. After all, the...
Sometimes you want to fetch associations for an ActiveRecord that you already loaded, e.g. when it has deeply nested associations...
Rails includes a way to see what an e-mail will look like. Integration to RSpec All you need to...
When giving a presentation where you do some coding, the font size you usually use is probably a bit too...
If you try to listen to events on elements that are nested inside a , Firefox will stop event propagation once...
When internationalizing your Rails app, you'll be replacing strings like 'Please enter your name' with t('.name_prompt'). You...
Also see the list of IRB commands. Switching the context Changes the "default receiver" of expressions. Can be used to...
PostgreSQL offers a really handy field type: json. You can store any JSON there, in any structure. While its flexibility...
...the file system. Since load order can be important, this may lead to different behavior on different machines which are hard to debug. Simply add a .sort: Dir.glob(Rails.root.join('lib/ext...
before(:all) runs the block once before all of the examples. before(:each) runs the block once before each...
In the discussion of the difference between include and extend in Ruby, there is a misconception that extend would add...
While debugging an intricate issue with failed HTTP requests I have come to appreciate the more advanced features of the...
In general, you should not put a block element inside an inline element. So don't do this: text
...often show or hide elements based on viewport dimensions, or may have components that behave differently (like mobile vs desktop navigation menus). Since you want your integration tests to behave...
...metrics". This allows you to configure dimensions larger than your display and enable/disable touch behavior. Simply use register_driver to set up a driver that you then connect to Capybara...
When your Rails application offers downloading a bunch of files as ZIP archive, you basically have two options: