Contents

# extended Relation: extracts relation from rows
class Relation < ActiveRecord::Base
  def self.add(row_from, row_to)
    hsh = normalize(row_from, row_to)
    Relation.create!(hsh) if Relation.where(hsh).first.nil?
  end

  def self.delete(row_from, row_to)
    hsh = normalize(row_from, row_to)
    Relation.where(hsh).delete_all
  end

  def self.references(row, kind)
    klass, name, from_id = normalize2(kind, row)
    name = "#{name} #{klass.name}"
    ids = references_raw(name, from_id)
    klass.where(id: ids)
  end

  def self.followers(kind, row)
    klass, name, to_id = normalize2(kind, row)
    name = "#{klass.name} #{name}"
    ids = followers_raw(name, to_id)
    klass.where(id: ids)
  end

  def self.name_id(resource)
    raise 'missing resource' unless resource

    [resource.class.name, resource.id]
  end

  def self.normalize(row_from, row_to)
    name_from, from_id = name_id(row_from)
    name_to, to_id     = name_id(row_to)
    name = "#{name_from} #{name_to}"
    { name: name, from_id: from_id, to_id: to_id }
  end

  def self.normalize2(kind, row)
    klass = kind
    klass = kind.constantize unless klass.is_a?(Class)
    name, id = name_id(row)
    [klass, name, id]
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
relation-0.3.8	app/models/relation_ext.rb
relation-0.3.7	app/models/relation_ext.rb
relation-0.3.5	app/models/relation_ext.rb