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Ruby Quicktips

@rubyquicktips

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

rubyquicktips.com
Joined January 2010
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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" %>...

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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...

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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...

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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...

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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...

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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...

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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...

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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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Rails' include_root_in_json tmblr.co/ZmLjSyGtoSzU
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