Notes

If you try to write

Model.select('field_one', 'field_two AS something').count

it will fail (at least for Rails 5.0) with the message PG::SyntaxError: ERROR: syntax error at or near "AS". In order to fix that issue, you should write

Model.select('field_one', 'field_two AS something').cou...

The ordinal method isn't publicly available in Rails 3 so you can do something like this:

ordinal(1).last(2) #=> "st"

ordinal(20).last(2) #=> "th"

RAILS EXCEPTION NOTIFIER

The Exception Notifier plugin provides a mailer object and a default set of templates for sending email notifications when errors occur in a Rails application. It is basically a monitoring tool, which keeps on watching the application and whenever it finds any error, it tri...

We might have heard about a lot many gems which let us implement search functionality in our rails application; for example: searchkick, elasticsearch-rails, ransack and finally, sunspot to work with solr search engine. All these gems have their own advantages. Both searchkick and elasticsearch use...

Gems are libraries in Rails that generally enable you to write the application code faster and thereby making a great product in far lesser time. Usually, whenever we start developing any application, there comes a point when we need data which we can use to see how the application will behave while...

If you execute glob within a block passed to Dir.chdir, you get the paths relative to the directory specified by Dir.chdir... like this... base_dir = '/path/to/dir' files = Dir.chdir(base_dir) do Dir.glob("**/*.yml") end files.first # => 'foo/bar.yml'

It's unclear if "select_tag" does this but the normal select method also generates a hidden variable if the "multiple" option is set, see http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/select

As a note, just for followers, even if a select is not "multiple" if it is "unselected" (ex: in javascript you can set its value like document.getElementById('select_id').value = 'a non option'; ). And if that form is submitted, the browser also seems to not send anything about it to the server....

If you pass nil as local file, it doesn't write the file and only returns the content as string.

With the fact we know about the two, many will perhaps prefer using struct rather than hash. But what we want to focus here is that behind the low performance given by hash, they still can become advantageous. If you can’t use it on its own little way, then convert it into struct so better usability...

we can load our data whenever we want.

ActiveRecord::Associations::Preloader.new.preload(@users, :company)

we can preload our data whenever we want.

ActiveRecord::Associations::Preloader.new.preload(@users, :address)

Rails 4: Let’s assume we have two models Movie and Actor. Actor has many movies and Movie belongs to Actor. In most of the cases, the developers used to validate the foreign key actor_id is present or not. In this case, it will not validate actor model as to whether the entered actor id exists or no...

ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]

==== Sort From Greatest to Smallest

>> [1, 2, 3, 4].sort { |a, z| z <=> a }
=> [4, 3, 2, 1]

since exit is a keyword in Ruby, the example may be confusing. The following example might be less so: module Foo begin # this raises an error b/c baz is not defined here alias_method :other_baz, :baz rescue NameError =>e puts e end

def baz
  put...

Note the checked: option.

%table
  = collection_check_boxes(:ahj_types, :ids, AhjType.order(:TypeName), :AHJTypeID, :TypeName) do |b|
    %tr
      %td{style: 'padding: 0 1em;'}
        = b.label(class: "check_box")
      %td{style: 'padding: 0 1em;'}
        = b.check_b...

Dalli is a high performance pure Ruby client for accessing memcached servers. It works with memcached 1.4+ only, as it uses the newer binary protocol.

Memcache Memcached is a quick in-memory protest reserving framework that can make Rails run much quicker with not very many changes. Memcached is an...

Use tag! method if you have semicolon, for example:

xml.tag!("atom:link", "href"=>"http://rubyplus.com/episodes.rss", "rel"=>"self", "type"=>"application/rss+xml")

Flay examines code for structural likenesses. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, props versus do/end, and so forth are all overlooked,making this absolutely rad. It’s fit for recognizing both correct and close matches, and d...

I have combined some of the tips here: http://www.rubyplus.net/2016/11/rails-dateselect-examples.html