Module: Gecko::Helpers::AssociationHelper

Included in:
Record::Base
Defined in:
lib/gecko/helpers/association_helper.rb

Overview

Helper for has_many/belongs_to relationships

Instance Method Summary collapse

Instance Method Details

#belongs_to(model_name, options = {}) ⇒ undefined

Set up a belongs_to relationship between two classes based on a JSON key of class_name_id.

Examples:

class Gecko::Record::Variant
  belongs_to :product
end

Parameters:

  • model_name (Symbol)
  • options (#to_hash) (defaults to: {}) —

    options for setting up the relationship

Options Hash (options):

  • :class_name (String) —

    Override the default class name

  • :readonly (String) — default: false —

    Whether to serialize this attribute

Returns:

  • (undefined) 


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# File 'lib/gecko/helpers/association_helper.rb', line 22

def belongs_to(model_name, options={})
  class_name  = options[:class_name] || model_name.to_s.classify
  foreign_key = model_name.to_s.foreign_key.to_sym

  define_method model_name do
    if (id = attributes[foreign_key])
      @client.adapter_for(class_name).find(id)
    end
  end
  attribute foreign_key, Integer, readonly: options[:readonly]
end

#has_many(association_name, options = {}) ⇒ undefined

Set up a has_many relationship between two classes based on a JSON key of class_name_ids.

Examples:

class Gecko::Record::Product
  has_many :variants
end

Parameters:

  • model_name (Symbol)
  • options (#to_hash) (defaults to: {}) —

    options for setting up the relationship

Options Hash (options):

  • :class_name (String) —

    Override the default class name

  • :readonly (String) — default: true —

    Whether to serialize this attribute

Returns:

  • (undefined) 


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# File 'lib/gecko/helpers/association_helper.rb', line 51

def has_many(association_name, options={})
  model_name = association_name.to_s.singularize
  class_name = options[:class_name] || model_name.classify
  foreign_key = model_name.foreign_key.pluralize.to_sym
  readonly    = options.key?(:readonly) ? options[:readonly] : true

  define_method association_name do
    ids = self.attributes[foreign_key]
    if ids.any?
      @client.adapter_for(class_name).find_many(ids)
    else
      []
    end
  end
  attribute foreign_key, Array[Integer], readonly: readonly
end