Jeweler::Utils

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A utility package of various Core Extensions, helpers and Ruby Patterns we use for developing Jeweler.

Usage

Service Object Pattern

Used to build a Service Object.

• Returns result method which is set to the value of the result of the Call method
• Returns any errors in the @errors variable with initialized as an empty Array. Place error messages here.
  • These can optionally be logged as a warning.
• Fatal errors can be stored in @fatals Array (initialized empty).
  • This automatically enters the generic warning message There was an error. Contact Support. into @errors
  • These automatically get logged as errors.
• Successful message is stored in @result_message, initialized as an empty String ''

Example:

class UpdateTask < Jeweler::Service
  def initialize(task)
    @task = task
  end

  def call
    if task.update(hours: 4)
      Note.create_event(task.sprint.project, 'task_deleted', 'Deleted: ' + task.description)
    else
      task.errors.full_messages.map { |e| fatals << 'Error Destroying Task: ' + e }
    end
    task
  end

  private
  attr_reader :task
end
# Usage:
@service_object = DestroyTask.call(@task)
@service_object.errors # Combined array of fatals and errors. They are logged differently by Jeweler::Service though
@service_object.result # Task<id: 7, hours: 3...>

class ServiceObject1 < Jeweler::Service
  def call
    errors << 'error 1'
    errors << 'error 2'
    fatals << 'fatal 1'
  end
end
so = ServiceObject1.call
# ServiceObject1.errors = ['error 1', 'error 2', 'There was an error. Contact Support.']

String

true? - returns true if the string is explicitly equal to 'true'

'true'.true? # returns true ONLY
'truue'.true? # returns false

.to_b - converts the string 'true' and 'false' explicitly / respectively to TRUE / FALSE, otherwise it will throw an exception.

'true'.to_b # TRUE
'false'.to_b # FALSE
'faalse'.to_b # Throws an Exception

String, BigDecimal, Decimal, Float, Integer

.money - will convert this to a formatted USD money String, rounding it to 0 decimal places if it is a whole number

(500.84).money # '$500.84'
(500.00).money # '$500'

BigDecimal, Decimal, Float, Integer, Double

(Double does not have a rate)

.prettify - Rounds the number to 0 decimal places if it is a whole number anyway

(500.00).prettify # 500
(500.87).prettify # 500.87

.rate - Converts a number to an hourly-rate in USD ($/hr) (String)

(55.50) # '$55.50/hr'

.hours - Appends hours or hour to the end of a number, converts it to String

(5).hours # '5 hrs'
(1).hours # '1 hr'

NilClass

These, as well as the methods above are for displaying these numbers in the UI. I prefer these cleaner methods to the decorator pattern (in these few use-cases), because it is really really clean.

(nil).prettify - returns 0 (Integer) (nil).hours - returns '0 hr.' (String) (nil).money - returns '$0' (String) (nil).true? - returns False (Boolean) (nil).to_b - returns False (Boolean)

Array

.log_errors(prefix_msg = nil) - Logs all of these errors, as errors, prefixed with the param (optionally)

sprint.errors.full_messages.log_errors('Error Saving Sprint')
# log.warn - Error Saving Sprint: the validation error while saving sprint

sprint.errors.full_messages.log_errors
# log.warn - the validation error while saving sprint

Installation

Add this line to your application's Gemfile:

gem 'jeweler-utils'

And then execute:

$ bundle

Or install it yourself as:

$ gem install jeweler-utils

Contributing

Just submit a pull request with your modifications and I will take a look.

License

The gem is available as open source under the terms of the MIT License.