Associations named using a string cannot be included in a scope
If you defined your association via
class Article
belongs_to "category"
end
and you try
Article.scoped(:include => :category)
you will get an error message
in `preload_one_association': Association named 'category' was not found; perhaps you misspelled it? (ActiveRecord::ConfigurationError)
Solution
Always define your assocations via symbol
class Article
belongs_to :category
end
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