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PORails nested form, calulate value from nested items during
 

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    <p>I am new to rails and am working on one of my first rails projects, it is an invoice app with nested line items within the invoice form. I want to calculate the total invoice before I save the invoice. I get it to save nicely if just added items during the save process, but it doesn't calulate the total correctly if one of the nested line items is tagged to be deleted. I would have to go back in and save again to get the correct total billed amount.</p> <pre><code>class Invoice &lt; ActiveRecord::Base attr_accessible :job_name, :items_attributes, :tax1, :tax2, :subtotal before_save :calculate_totals has_many :items, :dependent =&gt; :destroy accepts_nested_attributes_for :items, allow_destroy: true private def calculate_totals self.subtotal = 0 self.items.each do |i| self.subtotal = self.subtotal + (i.quantity * i.cost_per) end end end </code></pre> <p>I'm note sure how this differs from params but the problem item record is listed in the requested paramaters with :_destroy = true</p> <pre><code>{"utf8"=&gt;"✓", "_method"=&gt;"put", "authenticity_token"=&gt;"+OqRa7vRa1CKPMCdBrjhvU6jzMH1zQ=", "invoice"=&gt;{"client_id"=&gt;"1", "job_name"=&gt;"dsdsadsad", "items_attributes"=&gt;{"0"=&gt;{"name"=&gt;"jhksadhshdkjhkjdh", "quantity"=&gt;"1", "cost_per"=&gt;"50.0", "id"=&gt;"21", "_destroy"=&gt;"false"}, "1"=&gt;{"name"=&gt;"delete this one", "quantity"=&gt;"1", "cost_per"=&gt;"10.0", "id"=&gt;"24", "_destroy"=&gt;"true"}}}, "commit"=&gt;"Update Invoice", "id"=&gt;"8"} </code></pre> <p>Thanks for you help.</p>
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