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POUsing many-to-many nested models in Rails
 

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    <p>I've got the following situation setup to model a Customer with multiple addresses and a reference table for the type of address. The data model is Customer - Address : many to many relationship, represented with a join table called 'Location'.<br> LocationType - Location : one to many, so that a locationtype (eg 'work', 'home') can have many associations to a Location.</p> <p>What i'm trying to achieve is the ability to simply locate all the 'work' addresses for a customer, or the 'delivery' addresses. Whilst avoiding having the text duplicated in the join table Location</p> <p>The model(s) look like:</p> <pre><code>class Address &lt; ActiveRecord::Base has_many :locations has_many :customers, :through =&gt; :locations end class Customer &lt; ActiveRecord::Base has_many :locations has_many :addresses, :through =&gt; :locations do def special_location(loc) find :all, :conditions =&gt; ['addr_type == ?', loc] end end end class Location &lt; ActiveRecord::Base belongs_to :address belongs_to :customer belongs_to :locationtype end class LocationType &lt; ActiveRecord::Base has_many :locations end </code></pre> <p>This works ok for the simple cases of : </p> <pre><code>@customer = Customer.find(1) @customer.addresses # return all addresses </code></pre> <p>And with the 'special helper method' of special_location("string") I can achieve the result. What I wanted to find out is how I could achieve the same via the use of the additional reference table (LocationType)<br> Something along the lines of </p> <pre><code>@customer.addresses.find_locationtype("work") </code></pre>
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    1. USDamien MATHIEU
    1. USGrant Sayer
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    1. COI overlooked the one-to-many relationship of Addresses to Locations. Damien MATHIEU's solution is closer to what needs to be done.
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