items = Model .where(first_name: 'Harvey') .where('id = 3') .where('id = ?', 3) .order(:title) .order(title: :desc) .order("title DESC") .reorder(:title) # discards other .order's .rewhere(...) # discards other .where's .limit(2) .offset(1) .uniq See: QueryMethods items = Model .select(:id) .select([:id, :name]) .group(:name) # GROUP BY name .group('name AS grouped_name, age') .having('SUM(price)
Active Record Active Record objects don’t specify their attributes directly, but rather infer them from the table definition with which they’re linked. Adding, removing, and changing attributes and their type is done directly in the database. Any change is instantly reflected in the Active Record objects. The mapping that binds a given Active Record class to a certain database table will happen au
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