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POHow to add sequences to a migration and use them in a model?
 

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    <p>I want to have a "<code>Customer</code>" Model with a normal primary key and another column to store a custom "Customer Number". In addition, I want the db to handle default Customer Numbers. I think, defining a sequence is the best way to do that. I use PostgreSQL. Have a look at my migration:</p> <pre><code>class CreateAccountsCustomers &lt; ActiveRecord::Migration def up say "Creating sequenze for customer number starting at 1002" execute 'CREATE SEQUENCE customer_no_seq START 1002;' create_table :accounts_customers do |t| t.string :type t.integer :customer_no, :unique =&gt; true t.integer :salutation, :limit =&gt; 1 t.string :cp_name_1 t.string :cp_name_2 t.string :cp_name_3 t.string :cp_name_4 t.string :name_first, :limit =&gt; 55 t.string :name_last, :limit =&gt; 55 t.timestamps end say "Adding NEXTVAL('customer_no_seq') to column cust_id" execute "ALTER TABLE accounts_customers ALTER COLUMN customer_no SET DEFAULT NEXTVAL('customer_no_seq');" end def down drop_table :accounts_customers execute 'DROP SEQUENCE IF EXISTS customer_no_seq;' end end </code></pre> <p>If you know a better "rails-like" approach to add sequences, would be awesome to let me know.</p> <p>Now, if I do something like </p> <pre><code>cust = Accounts::Customer.new cust.save </code></pre> <p>the field <code>customer_no</code> is not pre filled with the next value of the sequence (should be 1002).</p> <p>Do you know a good way to integrate sequences? Or is there a good plugin? Cheers to all answers!</p>
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