Hello,
I am trying to update an integer value on a table using Rails, but it
complains that I am violating a not-null constraint because I didn''t
specify other attributes. My code is as follows:
sup = Supplier.new
sup.update_attribute(''num_products'', total_products)
The error I get is:
RuntimeError: ERROR C23502 Mnull value in column "name" violates
not-null constraint FexecMain.c 1782 RExecConstraints:
INSERT INTO suppliers("name", "num_products",
"drop_ship_fee",
"real_name", "return_policy", shipping_terms",
"url", "description")
VALUES(NULL, 161, 400, NULL, NULL, NULL, NULL, NULL)
Why is it doing an insert instead of just an update on the single
attribute I want to change? Thanks!
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> I am trying to update an integer value on a table using Rails, but it > complains that I am violating a not-null constraint because I didn''t > specify other attributes. My code is as follows: > > sup = Supplier.new > sup.update_attribute(''num_products'', total_products)You are creating a *new* Supplier in ''sup''. So there''s no associated record in the database for you to update the ''num_products'' column. Try something like: sup = Supplier.find(123) sup.update_attribute(''num_products'', total_products) -philip> > The error I get is: > > RuntimeError: ERROR C23502 Mnull value in column "name" violates > not-null constraint FexecMain.c 1782 RExecConstraints: > INSERT INTO suppliers("name", "num_products", "drop_ship_fee", > "real_name", "return_policy", shipping_terms", "url", "description") > VALUES(NULL, 161, 400, NULL, NULL, NULL, NULL, NULL) > > Why is it doing an insert instead of just an update on the single > attribute I want to change? 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Jul 11, 2007, at 5:23 PM, Philip Hallstrom wrote:>> I am trying to update an integer value on a table using Rails, but it >> complains that I am violating a not-null constraint because I didn''t >> specify other attributes. My code is as follows: >> >> sup = Supplier.new >> sup.update_attribute(''num_products'', total_products) > > You are creating a *new* Supplier in ''sup''. So there''s no associated > record in the database for you to update the ''num_products'' column. > > Try something like: > > sup = Supplier.find(123) > sup.update_attribute(''num_products'', total_products) > > -philip > >> The error I get is: >> >> RuntimeError: ERROR C23502 Mnull value in column "name" violates >> not-null constraint FexecMain.c 1782 RExecConstraints: >> INSERT INTO suppliers("name", "num_products", "drop_ship_fee", >> "real_name", "return_policy", shipping_terms", "url", "description") >> VALUES(NULL, 161, 400, NULL, NULL, NULL, NULL, NULL) >> >> Why is it doing an insert instead of just an update on the single >> attribute I want to change? Thanks!If that''s really what you want to do, there are a couple other ways to go about it: sup = Supplier.new(:num_products => total_products) sup = Supplier.new do |s| s.num_products = total_products end or if you want it to be on the disk NOW! you might want something like: sup = Supplier.create(:name => "Supplier One", :num_products => total_products) or check out the find_or_create_by_* methods (or even find_or_initialize_by_*) if you might have a record, but are sure you will have one by the time the call is finished. sup = Supplier.find_or_initialize_by_name("Supplier One") do |s| s.num_products = total_products # .. other changes end sup.save # writes the database once -Rob Rob Biedenharn http://agileconsultingllc.com Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---