I have these sql code in postgresql
"SELECT * from convenios where id NOT IN
(SELECT convenio_id from solicituds where usuario_id=?"

but don't find a way of used it in rails
except
find_by_sql.

There is  a another way??

class Usuario < ActiveRecord::Base
  belongs_to :persona
  has_many :solicituds, :dependent => :destroy
  has_many :convenios, :through => :solicituds
  has_many :nivelesacceso
  has_one :nomina
end

class Convenio < ActiveRecord::Base
  has_many :solicituds, :dependent => :destroy
  has_many :personas, :through => :solicituds
  validates_presence_of :nombre, :serie, :descripcion
  validates_uniqueness_of :serie
  validates_format_of :serie, :with => /cci|cue/
  validates_length_of :serie, :is => 8
end

class Solicitud < ActiveRecord::Base
  belongs_to :convenio
  belongs_to :usuario
end




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