在创建之前检查Rails中是否存在记录

Question

I am trying to search my database before I enter the record, by doing this:

Product.update_or_create_by_name_and_date_and_applicationURL_and_server_and_addi_servers(app_name, app_date,url_app,server_name,addi_servers)

the problem is that I get an undefined method exception!

Is there another way to search for the same record before entering one?

Answer 1

You should use two steps:

#Suggestion 1
obj = Product.find_or_create_by_...


#Suggestion 2
obj = Product.find_or_initialize_by_...

obj.update_attributes hash_here

Rereading, your question, I can't really understand what do you want to update if you try to find an object with known attributes. Anyway, you would just have to adapt my answer a little if some fields are for identifying and some for update.

Answer 2

I would define a function in your model: something like

Product.find_by_everything

where you write out all the parameters of the search, instead of using the the long naming method.

Then, if that returns nil, create the product. This doesn't seem to be a good use case of using the built in activerecord naming methods.