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POCustom db entry for 3 way habtm in ROR
 

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    <p>I am converting an existing perl gtk app into a ROR app</p> <p>I have a 3 way habtm association model.</p> <pre><code>class CustomerMaster &lt; ActiveRecord::Base has_and_belongs_to_many :address_master, :join_table =&gt; "customer_phone_addres" has_and_belongs_to_many :phone_master, :join_table =&gt; "customer_phone_address" class AddressMaster &lt; ActiveRecord::Base has_and_belongs_to_many :customer_master, :join_table =&gt; "customer_phone_addres" has_and_belongs_to_many :phone_master, :join_table =&gt; "customer_phone_addres" class PhoneMaster &lt; ActiveRecord::Base has_and_belongs_to_many :customer_master, :join_table =&gt; "customer_phone_addres" has_and_belongs_to_many :address_master, :join_table =&gt; "customer_phone_addres" </code></pre> <p>The join table has the following schema</p> <pre><code>CREATE TABLE customer_phone_address ( id bigserial NOT NULL, customer_master_id bigint, phone_master_id bigint, address_master_id bigint, CONSTRAINT customer_phone_address_pkey PRIMARY KEY (id), CONSTRAINT address FOREIGN KEY (address_master_id) REFERENCES address_master (id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION, CONSTRAINT customer FOREIGN KEY (customer_master_id) REFERENCES customer_master (id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION, CONSTRAINT phone FOREIGN KEY (phone_master_id) REFERENCES phone_master (id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION, CONSTRAINT uniq_cust_phone_address UNIQUE (customer_master_id, phone_master_id, address_master_id) ) </code></pre> <p>And I have created a nested form for customer_master#new which takes inputs for both address_master and phone_master</p> <p>Originally for the perl gtk app, only one entry is created in the join_table for each entry of customer, address and phone</p> <pre><code>id|customer_master_id|phone_master_id|address_master_id 186767|182774|500773|210683 </code></pre> <p>However using the above relationship model, I get two entries in case of ROR</p> <pre><code>id|customer_master_id|phone_master_id|address_master_id 186769|182810|500775|nil| 186770|182810|nil|211935| </code></pre> <p>I need to maintain backward compatibility to the perl gtk app. <strong>How do I get that single entry in the join table instead of the two entries?</strong></p> <p>I think this question is similar to <a href="https://stackoverflow.com/questions/5507150/custom-join-3-tables-usage-in-rails-2-3-8">https://stackoverflow.com/questions/5507150/custom-join-3-tables-usage-in-rails-2-3-8</a></p>
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