Class: Arel::SelectManager

Inherits:
TreeManager
  • Object
show all
Defined in:
lib/arel/visitors/sqlserver.rb

Instance Method Summary collapse

Instance Method Details

#lock(locking = true) ⇒ Object

A friendly over ride that allows us to put a special lock object that can have a default or pass custom string hints down. See the visit_Arel_Nodes_LockWithSQLServer delegation method.



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# File 'lib/arel/visitors/sqlserver.rb', line 63

def lock(locking=true)
  if Arel::Visitors::SQLServer === @visitor
    @ast.lock = Arel::Nodes::LockWithSQLServer.new(locking)
    self
  else
    lock_without_sqlserver(locking)
  end
end

#lock_without_sqlserver ⇒ Object 



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# File 'lib/arel/visitors/sqlserver.rb', line 29

alias :lock_without_sqlserver :lock

#order(*exprs) ⇒ Object 



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# File 'lib/arel/visitors/sqlserver.rb', line 36

def order(*exprs)
  return order_without_sqlserver(*exprs) unless Arel::Visitors::SQLServer === @visitor
  @ast.orders.concat(exprs.map{ |x|
    case x
    when Arel::Attributes::Attribute
      table = Arel::Table.new(x.relation.table_alias || x.relation.name)
      expr = table[x.name]
      Arel::Nodes::Ordering.new expr
    when Arel::Nodes::Ordering
      x
    when String
      x.split(',').map do |s|
        expr, direction = s.split
        expr = Arel.sql(expr)
        direction = direction =~ /desc/i ? :desc : :asc
        Arel::Nodes::Ordering.new expr, direction
      end
    else
      expr = Arel.sql(x.to_s)
      Arel::Nodes::Ordering.new expr
    end
  }.flatten)
  self
end

#order_without_sqlserver ⇒ Object

Getting real Ordering objects is very important for us. We need to be able to call #uniq on a colleciton of them reliably as well as using their true object attributes to mutate them to grouping objects for the inner sql during a select statment with an offset/rownumber. So this is here till ActiveRecord & ARel does this for us instead of using SqlLiteral objects.



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# File 'lib/arel/visitors/sqlserver.rb', line 35

alias :order_without_sqlserver :order