Em 15-10-2013 16:38, Jeremy Evans escreveu:
On Tuesday, October 15, 2013 10:07:53 AM UTC-7, Rodrigo Rosenfeld
Rosas wrote:
Is there any alternative in Sequel for ActiveRecord's
find_or_initialize_by class method?
http://edgeapi.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-find_or_initialize_by
<http://edgeapi.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-find_or_initialize_by>
http://guides.rubyonrails.org/active_record_querying.html#find-or-initialize-by
<http://guides.rubyonrails.org/active_record_querying.html#find-or-initialize-by>
I could only find find_or_create:
http://sequel.rubyforge.org/rdoc/classes/Sequel/Model/ClassMethods.html#method-i-find_or_create
<http://sequel.rubyforge.org/rdoc/classes/Sequel/Model/ClassMethods.html#method-i-find_or_create>
Thanks in advance,
Rodrigo.
Nope, there isn't an alternative method. You can do:
object = Model.find(...) || Model.new(...)
Yes, I'm using the exact same implementation as AR in a custom plugin:
module ClassMethods
def find_or_initialize(attributes, &block)
find(attributes) || new(attributes, &block)
end
end
I'm not sure this method is common enough to be warrant adding to
Sequel::Model itself. As it is trivial to implement yourself, there
doesn't seem to be a good reason to add it.
I believe it's quite common. This is the second time I felt the need for
it in my application.
This is very common in some save actions where you either update or
create a record but where find_or_create is not suitable.
Also, implementation of find_or_create is also trivial, but it's part of
the core.
Here's a typical usage:
comment = FieldValueComment.find_or_initialize(transaction_id:
params[:transaction_id].to_i, field_id: params[:field_id].to_i)
# you can't use find_or_create because date and message are required columns
comment.date = Time.now
comment.message = params[:message].strip
comment.save raise_on_failure: true
render :ok
It seems find_or_initialize_by is used a lot in open-source code in GitHub:
https://github.com/search?q=find_or_initialize_by&ref=cmdform&type=Code
" We've found 2,807 code results"
Hopefully this could be part of core Sequel.
Thanks for considering,
Rodrigo.
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