Module: Constantizable::ClassMethods

Defined in:
lib/constantizable.rb

Overview

Constantizable extends ‘ActiveSupport::Concern` for some of the rails niceties like, `ClassMethods` and to include it into `ActiveRecord::Base`.

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object (private) 



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# File 'lib/constantizable.rb', line 19

def method_missing(method, *args, &block)
  # In the case that an object's constantized column value corresponds to the method name,
  # the object is returned, else execution is delegated to the default `method_missing` 
  # implementation.

  # If Column name isn't present it should fallback to the default `method_missing` 
  # implementation.

  column_names = @constantized_columns
  super if column_names.blank?

  # The value of the constantized column needs to be titleized or underscored, 
  # for the implementation to work.
  # (eg)
  # Country with name "United States Of America", will correspond to the query,
  # Country.united_states_of_america.
  # Country with name "India", will correspond to the query,
  # Country.india.
  # Country with name "united_kingdom", will correspond to the query,
  # Country.united_kingdom.
  record = nil
  column_names.each do | column_name |
    break if record.present?
    record = self.find_by("lower(#{column_name}) = ? or lower(#{column_name}) = ?", method.to_s.downcase, method.to_s.titleize.downcase)    
  end

  if record.present?
    record
  else
    super
  end
  
rescue
  super
end

Instance Method Details

#constantize_column(*columns) ⇒ Object 



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# File 'lib/constantizable.rb', line 7

def constantize_column(*columns)
  # This method is set as a class method as it can directly be invoked from model definitions
  # as follows.

  # Class Country < ActiveRecord::Base
  #   constantize_columns :name, :code
  # end

  @constantized_columns = columns
end