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Railscasts Episode #215: Advanced Queries in Rails 3
http://railscasts.com/episodes/215
rails console
Product.cheap.to_sql
(Category.joins(:products) & Product.cheap).to_sql
Category.with_cheap_products.to_sql
p = Product.discontinued.build
p.discontinued
t = Product.arel_table
t[:price].eq(2.99)
t[:name].matches("%catan").to_sql
Product.where(t[:price].eq(2.99).or(t[:name].matches("%catan")))
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