Your situation suggests using polymorphic associations, which are much cleaner than has_many :through associations. For example: class Person has_many :emails, :as => :emailable end class Company has_many :emails, :as => :emailable end class Email belongs_to :emailable, :polymorphic => true end You can get rid of your PersonEmails class entirely. In the database, your emails table will look something like this: create_table :emails do |t| t.
String :address t. String :emailable_type t. Integer :emailable_id end The emailable_type column stores the name of the associated model, in your case Person or Company and the emailable_id stores the id of the associated object.
For more information see the Rails API documentation under "Polymorphic Associations.
Your situation suggests using polymorphic associations, which are much cleaner than has_many :through associations. For example: class Person has_many :emails, :as => :emailable end class Company has_many :emails, :as => :emailable end class Email belongs_to :emailable, :polymorphic => true end You can get rid of your PersonEmails class entirely. In the database, your emails table will look something like this: create_table :emails do |t| t.
String :address t. String :emailable_type t. Integer :emailable_id end The emailable_type column stores the name of the associated model, in your case "Person" or "Company", and the emailable_id stores the id of the associated object.
For more information see the Rails API documentation under "Polymorphic Associations".
I don't know ruby, but as far as the database design part of your question, this question on stackoverflow may help you.
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