RoR - Modell Beziehung

Question

Hallo habe eine Tabelle namens Kategorie, die zwei Fremdschlüssel für die Tabelle Benutzer hat, Struktur ist unten angegeben. Wie kann ich den Benutzernamen, der created_by und moded_by entspricht, mithilfe von relations abrufen? @category = Category.find(params[:id]) gibt nur die Details aus der Kategorietabelle an. Meine aktuelle Modellklasse ist

class Category < ActiveRecord::Base 
    validates_uniqueness_of :title, :message => "Title already exist" 
    validates_presence_of :title, :message => "Cannot be blank" 
    belongs_to :user 
end 

Wie kann ich assoziieren sowohl die Felder CREATED_BY und MODIFIED_BY den Benutzer Modell

CREATE TABLE IF NOT EXISTS `categories` (
    `id` int(11) unsigned NOT NULL auto_increment, 
    `title` varchar(255) NOT NULL, 
    `created_by` int(11) unsigned default NULL, 
    `modified_by` int(11) unsigned default NULL, 
    `created` datetime NOT NULL, 
    `modified` timestamp NOT NULL default CURRENT_TIMESTAMP, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `created_by` (`created_by`), 
    UNIQUE KEY `modified_by` (`modified_by`) 

CREATE TABLE IF NOT EXISTS `users` (
    `id` int(11) unsigned NOT NULL auto_increment, 
    `username` varchar(25) NOT NULL, 
    `password` varchar(255) NOT NULL, 
    `usertype_id` int(11) unsigned NOT NULL, 
    `active` tinyint(1) NOT NULL, 
    `created` datetime NOT NULL, 
    `modified` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `usertype_id` (`usertype_id`) 
) 


-- 
-- Constraints for table `categories` 
-- 
ALTER TABLE `categories` 
    ADD CONSTRAINT `categories_ibfk_1` FOREIGN KEY (`created_by`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE CASCADE, 
    ADD CONSTRAINT `categories_ibfk_2` FOREIGN KEY (`modified_by`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE CASCADE; 

Answer 1

Dies sollte für Sie arbeitet:

class Category < ActiveRecord::Base 
    # ... 
    validates_uniqueness_of :title, :message => "Title already exist" 
    validates_presence_of :title, :message => "Cannot be blank" 
    belongs_to :creator, :foreign_key => 'created_by', :class_name => 'User' 
    belongs_to :editor, :foreign_key => 'modified_by', :class_name => 'User' 
    # ... 
end 

class User < ActiveRecord::Base 
    # ... 
    has_many :created_categories, :class_name => 'Category', :foreign_key => 'created_by'                     
    has_many :modified_categories, :class_name => 'Category', :foreign_key => 'modified_by' 
    # ... 
end