CODEWITHSUNDEEP
ruby-on-railsnested-forms
Siegfried Grimbeek
Siegfried Grimbeek

Reputation: 897

How to get the values from a form before_update?

I need to get the values from a form and adjust it before the form updates.

What I have is a Project and a project has many Main Groups and Main Groups has many Trades.

So before I save a form, I want to check if there are any values for the cost input in Trades and if there are, the sum of this should overwrite the cost value for Main Groups.

So here is what I have:

class MainGroup < ActiveRecord::Base
    belongs_to :project

    has_many :trades
    accepts_nested_attributes_for :trades, :reject_if => :all_blank, :allow_destroy => true 

    private

    before_update do
        if (self.trades.sum(:cost) != 0)
            self.cost = self.trades.sum(:cost)
        else
            self.cost = self.cost       
        end
    end

end

The only problem is that it uses the current values in the DB instead of the new ones in the form.

Thanks.

Upvotes: 0

Views: 76

Answers (1)

Santanu
Santanu

Reputation: 960

before_save :update_cost_from_trades

private

def update_cost_from_trades  
  unless trades.sum(:cost).is_zero?  
    self.cost = trades.sum(:cost)
  end  
end

Upvotes: 1

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