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PORails - Problems refactoring controller's nested attribute creation
 

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  1. PORails - Problems refactoring controller's nested attribute creation
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    <p>I have models:</p> <pre><code>Transaction has_many :credits, :debits Credit belongs_to :transaction Debit belongs_to :transaction </code></pre> <p>Each credit must have a balancing debit and vice versa.</p> <p>I currently (successfully) achieve this with the following inside Transaction's create method:</p> <pre><code>@transaction = Transaction.new(params[:transaction]) Transaction.transaction do # Balance debits with credits (Sales) if params[:balance_transaction] == 'credit' @transaction.credits.each do |credit| @transaction.debits.push(Debit.new({ :quantity =&gt; 0, :cost_per_unit =&gt; 0, :description =&gt; 'Balancing Debit', :amount =&gt; credit.amount, :account_id =&gt; 23 #Get from settings in future to allow users to choose Debtor account })) end elsif params[:balance_transaction] == 'debit' @transaction.debits.each do |debit| @transaction.credits.push(Credit.new({ :quantity =&gt; 0, :cost_per_unit =&gt; 0, :description =&gt; 'Balancing Credit', :amount =&gt; credit.amount, :account_id =&gt; 43 #Get from settings in future to allow users to choose Creditor account })) end else raise ActiveRecord::Rollback # There's no balancing transaction. Don't save it! end end </code></pre> <p>I tried moving the balancing debit/credit creation into the debit/credit models by replacing <code>@transactions.credits.push(...) with debit.balancing_credit</code> and putting the following in the debit model:</p> <pre><code>def balancing_credit transaction.credits.new({ :quantity =&gt; 0, :cost_per_unit =&gt; 0, :description =&gt; 'Balancing Debit', :amount =&gt; amount, :account_id =&gt; 43 #Get from settings in future to allow users to choose Creditor account }) end </code></pre> <p>I thought this was pretty straightforward refactoring, but it throws up an <code>undefined method 'debits' for nil:NilClass</code> error. Seems it looks in the database for the not yet saved transaction in order to create the balancing credit? Am I doing something wrong?</p>
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