God, def increase_product_purchase product.increase_quantity(quantity) end
in product def increase_quantity(quantity) update_attribute(:quantity, number_of_purchases + quantity) end or simply in purchase def increase_product_purchase product.update_attribute(:quantity, product.quantity + quantity) end ? On Jul 20, 2011, at 23:55 , Angelo Cordova wrote: > no, that's not what I'm looking for > > product.quantity is the current amount of products > purchase.quantity is the amount of products I buy > > so the new product.quantity should be the "old" product.quantity + > purchase.quantity > > eg > > current product.quantity = 5 > purchase.quantity = 20 > > new product.quantity = 25 > > > On Jul 20, 5:32 pm, Tom Meinlschmidt <to...@meinlschmidt.com> wrote: >> do you have some relation here? >> >> eg >> >> product >> has_many :purchases >> >> puchase (has column product_id) >> belongs_to :product >> >> and in purchase.rb >> after_create :increase_product_purchase >> >> def increase_product_purchase >> product.increase_purchase >> end >> >> and in product.rb >> >> def increase_purchase >> update_attribute(:number_of_purchases, number_of_purchases + 1) >> end >> >> On Jul 20, 2011, at 23:08 , Angelo Cordova wrote: >> >> >> >> >> >> >> >> >> >>> Hi people >> >>> I have a doubt. >> >>> I have 2 tables (models) "Product" and "Purchase". I want to use the >>> callback after_create to update the attribute Product.quantity every >>> time a Purchase is created, so I think this should be work, but I >>> don't know the right syntax >> >>> In purchase model >> >>> def after_create >>> Product.update(product.quantity = product.quantity + >>> purchase.quantity) >>> end >> >>> can somebody help me with this?? >>> thanks >> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Ruby on Rails: Talk" group. >>> To post to this group, send email to rubyonrails-talk@googlegroups.com. >>> To unsubscribe from this group, send email to >>> rubyonrails-talk+unsubscr...@googlegroups.com. >>> For more options, visit this group >>> athttp://groups.google.com/group/rubyonrails-talk?hl=en. >> >> -- >> =============================================================================== >> Tomas Meinlschmidt, MS {MCT, MCP+I, MCSE, AER}, NetApp Filer/NetCache >> >> www.meinlschmidt.com www.maxwellrender.cz www.lightgems.cz >> =============================================================================== > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to rubyonrails-talk@googlegroups.com. > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. -- =============================================================================== Tomas Meinlschmidt, MS {MCT, MCP+I, MCSE, AER}, NetApp Filer/NetCache www.meinlschmidt.com www.maxwellrender.cz www.lightgems.cz =============================================================================== -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
