Ruby Quicktips (@rubyquicktips) profile picture

Ruby Quicktips

@rubyquicktips

Random Ruby and Rails tips. Visit the website to submit your own tips.

rubyquicktips.com
Joined January 2010
  • Tweets155
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  • Followers1.3K
Replying to @pineappleio
@pineappleio Yes. Just hibernating. I (@pie4dan) will start writing tips again in April, but might have some user submissions to post soon.
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Quick Hash to a URL Query trick tmblr.co/ZmLjSyRfC8si

Quick Hash to a URL Query trick

Got a hash of values you want to convert into a url query string? Use [the to_query method](http://api.rubyonrails.org/classes/Object.html#method-i-to_query "Object"): "http://www.example.com?" + {...

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Testing CSV file uploads tmblr.co/ZmLjSyPsG58y

Testing CSV file uploads

Let's say you have a form like this for uploading a CSV file: <%= form_tag csv_import_path, :multipart => true do %> <%= file_field_tag :file, :accept => "text/csv" %> <%= submit_tag "Upload" %>...

rubyquicktips.com
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Using ActiveRecord to query for times within a range tmblr.co/ZmLjSyKnk0DJ

Ruby Quicktips

You can pass a range to query for records within that range:

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Try out your helpers in the console tmblr.co/ZmLjSyKg1t5t

Try out your helpers in the Rails console

Ever wanted to try out any of Rails' view helper methods in the console? Just include `ActionView::Helpers` after starting the Rails console: include ActionView::Helpers # => Object...

rubyquicktips.com
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Creating regular expressions with r{} literals tmblr.co/ZmLjSyJvobLd
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Create a hash from an array with Hash[*arr] tmblr.co/ZmLjSyJp4Ey3

Create a hash from an array with Hash[*arr]

The [Hash::[] class method](http://www.ruby-doc.org/core-1.9.3/Hash.html#method-c-5B-5D "Class: Hash (Ruby 1.9.3)") can be used in addition to the [splat...

rubyquicktips.com
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Rails' index_by: the easy way to convert an Array to a Hash tmblr.co/ZmLjSyJXILEA
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Convert a number string in any base to a decimal number tmblr.co/ZmLjSyJTk_UP

Convert a number string in any base to a decimal number

As Brich Thompson notes in the comments on ["Convert between number bases easily"](http://rubyquicktips.com/post/18935873770/convert-between-number-bases-easily "Ruby Quicktips - Convert between...

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Two Ruby tricks using method chaining and Procs tmblr.co/ZmLjSyJ3QEAM
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Enumerable#each_with_object tmblr.co/ZmLjSyIkLaR2

Enumerable#each_with_object

Enumerable#each_with_object is quite similar to Enumerable#inject, yet slightly different. From the Ruby 1.9 and Rails 3 API docs: Iterates the given block for each element with an arbitrary object...

rubyquicktips.com
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Mark Deprecated Code in Ruby tmblr.co/ZmLjSyIeH8YO

Mark Deprecated Code in Ruby

To mark deprecated code in Ruby simply add a comment to the rdoc and call the Kernel#warn method. For example: class Foo # DEPRECATED: Please use useful instead. def useless warn...

rubyquicktips.com
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Using Hash as Recursive Function with Memoization tmblr.co/ZmLjSyINSeV9
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Block style comments tmblr.co/ZmLjSyIHBE0v
Method chaining with inject tmblr.co/ZmLjSyI0JxPI
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Pretend to generate tmblr.co/ZmLjSyHvrJ_6
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Convert between number bases easily tmblr.co/ZmLjSyHege3g

Convert between number bases easily

It's often a requirement in various projects to convert numbers from decimal to text representations of several other bases, such as hexadecimal or binary. Did you know you can convert to any base...

rubyquicktips.com
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Some Array magic using transpose, map and reduce tmblr.co/ZmLjSyHZ5kXM

Some Array magic using transpose, map and reduce

To add on corresponding elements of several arrays: a = [1, 2, 3] b = [4, 5, 6] c = [7, 8, 9] [a, b, c].transpose.map { |x| x.reduce :+ } # => [12, 15, 18] Given a number of arrays, each contains...

rubyquicktips.com
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Quick shortcut to load a SQL file in Rails tmblr.co/ZmLjSyHGzgEL

Quick shortcut to load a SQL file in Rails

You can easily load SQL files like this: rails db < path_to_sql_file.sql # Rails 3 script/dbconsole < path_to_sql_file.sql # Rails 2

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Around Alias tmblr.co/ZmLjSyHAOKhl

Around Alias

You can write an Around Alias in three simple steps: 1. You alias a method. 2. You redefine it. 3. You call the old method from the new method. Example: class String alias :orig_length :length ...

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