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

Since you need to perform multiple inserts, database will be hit multiple times. The delay in your case is because each save is done in different DB transactions. You can reduce the latency by enclosing all your operations in one transaction.

class Foo
  belongs_to  :parent,   :class_name => "Foo"
  has_many    :children, :class_name => "Foo", :foreign_key=> "parent_id"
end

Your save method might look like this:

# build the parent and the children
a = Foo.new(:name => "bar")
a.children.build(:name => "123")

b = Foo.new("baz")
b.children.build(:name => "zxy")

#save parents and their children in one transaction
Foo.transaction do
  a.save!
  b.save!
end

The save call on the parent object saves the child objects.