Saving multiple objects in a single call in rails

Question

I have a method in rails that is doing something like this:

a = Foo.new(\"bar\")
a.save

b = Foo.new(\"baz\")
b.save

...
x = Foo.new(\"123\", :parent_id =&g         


        

Answer 1

One of the two answers found somewhere else: by Beerlington. Those two are your best bet for performance

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I think your best bet performance-wise is going to be to use SQL, and bulk insert multiple rows per query. If you can build an INSERT statement that does something like:

INSERT INTO foos_bars (foo_id,bar_id) VALUES (1,1),(1,2),(1,3).... You should be able to insert thousands of rows in a single query. I didn't try your mass_habtm method, but it seems like you could to something like:

bars = Bar.find_all_by_some_attribute(:a) 
foo = Foo.create
values = bars.map {|bar| "(#{foo.id},#{bar.id})"}.join(",") 
connection.execute("INSERT INTO foos_bars (foo_id, bar_id) VALUES
#{values}")

Also, if you are searching Bar by "some_attribute", make sure you have that field indexed in your database.

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OR

You still might have a look at activerecord-import. It's right that it doesn't work without a model, but you could create a Model just for the import.

FooBar.import [:foo_id, :bar_id], [[1,2], [1,3]]

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Cheers