Class: OrderQuery::OrderSpace

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/order_query/order_space.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(scope, order) ⇒ OrderSpace

Returns a new instance of OrderSpace.



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# File 'lib/order_query/order_space.rb', line 9

def initialize(scope, order)
  @scope = scope
  @order = order.map { |line| OrderCondition.new(scope, line) }
end

Instance Attribute Details

#order ⇒ Object (readonly)

Returns the value of attribute order.



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# File 'lib/order_query/order_space.rb', line 5

def order
  @order
end

Instance Method Details

#order_by_reverse_sql ⇒ Object 



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# File 'lib/order_query/order_space.rb', line 35

def order_by_reverse_sql
  swap = {'DESC' => 'ASC', 'ASC' => 'DESC'}
  to_order_by_sql.map { |s| s.gsub(/DESC|ASC/) { |m| swap[m] }  } * ', '
end

#order_by_sql ⇒ Object 



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# File 'lib/order_query/order_space.rb', line 40

def order_by_sql
   to_order_by_sql * ', '
end

#reverse_scope ⇒ Object 



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# File 'lib/order_query/order_space.rb', line 18

def reverse_scope
  @scope.order(order_by_reverse_sql)
end

#scope ⇒ Object 



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# File 'lib/order_query/order_space.rb', line 14

def scope
  @scope.order(order_by_sql)
end

#to_order_by_sql ⇒ Object 



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# File 'lib/order_query/order_space.rb', line 22

def to_order_by_sql
  @order.map { |spec|
    ord = spec.order
    if ord == :asc || ord == :desc
      "#{spec.col_name_sql} #{ord.to_s.upcase}"
    elsif ord.respond_to?(:map)
      ord.map { |v| "#{spec.col_name_sql}=#{@scope.connection.quote v} #{spec.order_order.to_s.upcase}" } * ', '
    else
      raise "Unknown order #{spec.order.inspect} (#{spec.inspect})"
    end
  }
end