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Using has_many :through for nested has_many relations in Rails


has_many :through is a useful association type of Rails. It's mostly popular and often used as a join model for many-to-many relations.

rails-has-many-through

However, has_many :through is more than a simple join model, because it conducts INNER JOIN(s) on related models. We can also take the advantage of this beha...

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Running Rake Tasks in a Loop


Rake tasks in a loop, will only executed once when they are not re-enabled. Take a look to this example:


namespace :yoksis do
  desc 'fetches all references'
  task :references do
    mapping = {
      get_instruction_language: 'UnitInstructionLanguage',
      get_instruction_type: 'UnitInstructionType'
    }

    mapping.each do |action, klass|
      Rake::Task['yoksis:reference'].invoke(action, klass)
    end
  end

  desc 'fetch an individual reference'
  task :reference, %i[soap_method klass] => [:environment] do |_, args|
    puts args[:soap_method]
    puts args[:klass]
  end
end

When you run the yoksis:references task, it will only print out {get_instruction_language: 'UnitInstructionLanguage'} and will skip the second item of the mapping hash.

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Date: | Tags: ruby, ruby on rails, rake, rake in loop | Categories: tech, ruby, ruby on rails

Boolean Type Words in YAML


YAML is a widely used data serialization language. In any software development project, or a random dev-ops task you can come across with YAML. For example Ruby on Rails uses YAML for fixtures, configuration files and localization. CI/CD tools such as CircleCI and Travis also use YAML for configuration. If you ever experienced a strange behaviour with YAML, you may have used the reserved words of YAML. YAML reserves some words such as 'yes', 'no', 'y', 'n', 'off', 'on', etc. for boolean type. For example:

yes:
    turkish: evet
    german: ja
    english: yes
no:
    turkish: hayır
    german: nein
    english: no

will be interpreted as:

true:
    turkish: evet
    english: true
false:
    turkish: hayır
    english: false
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Date: | Tags: yaml, yaml reserved words, yaml boolean type | Categories: tech, ruby, ruby on rails

Rails Instantiated Fixtures


Here we have sample Ruby on Rails fixture file:

test/fixtures/newsletters.yml

tenant_newsletter:
  name: sample
  text_message: hello
  phone_number: 0555444332211
  first_name: foo
  last_name: bar

There are two popular ways to use fixtures in your Rails tests. The first one is directly calling the name of fixture file followed by a symbol stating the name of any individual fixture, ie:

class NewsletterTest < ActiveSupport::TestCase
  test 'a sample test' do
    assert newsletters(:tenant_newsletter).valid?
  end
 end
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Running Shell Commands with Rake


We all owe to Jim Weirich (RIP) - the father of the Rake, developer of many great projects such as builder, RubyKoans (I also contributed to this project lately with some PRs) and Git Immersion. I learned a lot from his talks on YouTube and really admire him.

In this post, I'm going to share a small tip about Rake for his memory and his awesome work.

Running shell commands with Rake is actually pretty simple and straightforward. sh followed by some bash commands is what we are going to be using.

Here is a basic example:

task :gs do
  sh "git status"
end

After defining the task like shown above, just run the task with:

$ rake gs

and you will see exactly the same output as git status does.

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Date: | Tags: rake, ruby and rake, rake examples, shell commands with rake | Categories: tech, ruby