[Rails] Rails3: ActiveRecord includes(:relation) not working

Hey everyone,

i can't build AR-Queries with relationships between tables. Here's a
short sample:

class Customer < ActiveRecord::Base
has_many :projects
end
class Project < ActiveRecord::Base
belongs_to :customer
end
When I execute the following Code in my Controller: @customers =
Customer.all.includes(:projects)
a NoMethodError (undefined method `includes' for #<Array:0xb679e030>)
is thrown.

Why did i receive an Array and not an Object of the class
ActiveRecord?

Thanks in advance for your help!

Greets, Gerrit

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