From Rails 3.0.9, there is a method Hash#to_query that will turn a Hash into a query string:

>> {:a => "a", :b => ["c", "d", "e"]}.to_query
=> "a=a&b%5B%5D=c&b%5B%5D=d&b%5B%5D=e"
>> CGI.unescape _
=> "a=a&b[]=c&b[]=d&b[]=e"

If you're on the browser side, you can serialize nestd objects to query strings using jQuery's $.param.

I got this error when running Rails 2.3 tests for Rails LTS. More stacktrace:

NoMethodError: undefined method `cache' for Gem:Module
    /vagrant/rails-2-3-lts-repository/railties/lib/rails_generator/lookup.rb:212:in `each'
    /vagrant/rails-2-3-lts-repository/railties/lib/rails_generator/lookup.rb:146:in `to_a'
    /vagrant/rails-2-3-lts-repository/railties/lib/rails_generator/lookup.rb:146:in `cache'
    /opt/vagrant_ruby/lib/ruby/1.8/fileutils.rb:243:in `inject'
    /vagrant/rails-2-3-lts-repository/railties/l...

Changes:

• Geordi is now (partially) tested with Cucumber. Yay!
• geordi cucumber supports a new @solo tag. Scenarios tagged with @solo will be excluded from parallel runs, and run sequentially in a second run
• Support for Capistrano 2 AND 3 (will deploy without :migrations on Capistrano 3)
• Now requires a .firefox-version file to set up a test firefox. By default now uses the system Firefox/a test Chrome/whatever and doesn't print warnings any more.
• geordi deploy --no-migrations (aliased -M): Deploy with `cap ...

Using Scenic, you can bring the power of SQL views to your Rails application without having to switch your schema format to SQL. Scenic provides a convention for versioning views that keeps your migration history consistent and reversible and avoids having to duplicate SQL strings across migrations. As an added bonus, you define the structure of your view in a SQL file, meaning you get full SQL syntax highlighting in the editor of your choice and can easily test your SQL in the database console during development.

[https://robots.thoughtb...

Dashboard (Marvel Kibana) and query tool (Marvel Sense) for Elasticsearch.

Once installed you can access Kibana and Sense at these local URLs:

• http://localhost:9200/_plugin/marvel/kibana/
• http://localhost:9200/_plugin/marvel/sense/

Ever wondered how you can create a simple table output in bash? You can use the tool column for creating a simple table output.

Column gives you the possibility to indent text accurate to the same level. Pipe output to column -t (maybe configure the delimeter with -s) and see the magic happening.

detailed example

I needed to separate a list of databases and their corresponding size with a pipe symbol: |
Here is a example list.txt:

DB	Size_in_MB
foobar	11011.2
barfoo	4582.9
donkey	4220.8
shoryuken	555.9
hadouken	220.0
k...

A comprehensive script to convert test suites from RSpec 2 to RSpec 3. This converts more than should/expect syntax.

Wondering which processes are placed in your swap you can use this bash oneliner:

for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | sort -k 2 -n -r

You will see the swap usage of each process sorted by the highes amount of swap usage.

Please don't forget that swap usage of a process isn't an indicator for high memory usage of this process but for the frequency of access or activity of it. The kernel tries to avoid swapping pages which were recently accessed.

Also you should notic...

Use this:

SELECT pg_database.datname as "database_name", pg_database_size(pg_database.datname)/1024/1024 AS size_in_mb FROM pg_database ORDER by size_in_mb DESC;

Want to see database sizes in MySQL ?

Once Rails knows a given string is html_safe, it will never escape it. However, there may be times when you still need to escape it. Examples are some safe HTML that you pipe through JSON, or the display of an otherwise safe embed snippet.

There is no semantically nice way to do this, as even raw and h do not escape html_safe strings (the former just marks its argument as html_safe). You need to turn your string into an unsafe string to get the escaping love from Rails:

embed = javascript_tag('var foo = 1337;') # This is an h...

You know that layouting HTML e-mails is terrible.

For more fun, check Litmus' list of top 10 e-mail developments of 2015 that did not make things better.

rack-mini-profiler is a powerful Swiss army knife for Rack app performance. Measure SQL queries, memory allocation and CPU time.

This should probably not be loaded in production (the article recommends otherwise), but this looks like a useful tool.

To delete a certificate request run sudo puppet ca destroy $your.full.hostname on your puppetmaster.

A list of surprisingly clever CSS expressions for common use cases.

There are cases when you need to select DOM elements without jQuery, such as:

• when jQuery is not available
• when your code is is extremely performance-sensitive
• when you want to operate on an entire HTML document (which is hard to represent as a jQuery collection).

To select descendants of a vanilla DOM element (i.e. not a jQuery collection), one option is to use your browser's native querySelector and [querySelectorAll](https://developer.mozilla.org/de/docs/We...

In developing countries like Nigeria, Opera Mini is used by up to 70% of users on mobile.
This is a collection of front-end development features not supported by Opera Mini and, more importantly, some crowdsourced workarounds for them. This isn't about bashing the problem, but figuring out the solution.

Changes:

• Remove some old binaries (commands still exist in geordi) and mark others as deprecated
• Rewrite deploy command to support most deploy scenarios:
  • master to production
  • feature branch to staging
  • master to staging or production to production (plain deploy)
• Improve Cucumber command (fixes #18):
  • Fix pass-through of unknown options to Cucumber
  • Add --rerun=N option to rerun failed Cucumber tests up to N times. Reboots the test environment between runs, thus will pick up fixes you made durin...

If you have many connections to your MySQL or MariaDB (as we have) you might want to filter the list you see when running a SHOW PROCESSLIST. To hide all sleeping processes, you can simply use grep as your pager:

\P grep -v "| Sleep"

There is an more advanced way by querying the information_schema database: Show MySQL process list without sleeping connections

In Ruby 2.3 you can use <<~ instead of <<- to automatically remove indentation from a HEREDOCs:

str = <<~MESSAGE
  Hello Universe!
  This is me.
             Bye!
MESSAGE

str will now be:

Hello Universe!
This is me.
           Bye!

When you're using feature branches, they will stack up if you don't delete them after the merge to master. Here's how to tidy them up.

Delete feature branches

Find already-merged branches by running

# On branch master
git branch --merged

You may safely delete each of the listed branches, because they point to commits that are contained in the history of your current branch (i.e. master).

git branch -d my/feature-branch # Delete feature branch locally
git push origin :my/feature-branch # Push *nothi...

Until recently, you could open a new tab via window.open when using execute_script in Selenium tests. It no longer works in Chrome (will show a "popup blocked" notification).

This is because browsers usually block window.open unless the user interacted with an element for security reasons. I am not sure why it did work via Selenium before.

Here is an approach that will insert a link into the page, and have Selenium click it:

path = "/your/path/here"
id = "helper_#{SecureRandom.hex(8)}"
execute_script <<-JAVASCRIPT
  ...

We will use this for new Angular code.

Consider the guide in "beta". Things will still refine, but the general structure should be final.

CSS4 comes with :has. E.g. h1:has(b) would select all <h1> tags that contain a <b> tag.

This is implemented in no browser but the jQuery query engine already supports it as a custom extension.