class Shoulda::Matchers::ActiveRecord::AssociationMatchers::ModelReflector

def build_relation_with_clause(name, value)
  case name
    when :conditions then associated_class.where(value)
    when :order      then associated_class.order(value)
    else                  raise ArgumentError, "Unknown clause '#{name}'"
  end
end

def extract_relation_clause_from(relation, name)
  case name
  when :conditions
    relation.where_values_hash
  when :order
    relation.order_values.map { |value| value_as_sql(value) }.join(', ')
  else
    raise ArgumentError, "Unknown clause '#{name}'"
  end
end

def initialize(subject, name)
  @subject = subject
  @name = name
end

def model_class
  subject.class
end

def reflect_on_association(name)
  reflection = model_class.reflect_on_association(name)
  if reflection
    ModelReflection.new(reflection)
  end
end

def reflection
  @reflection ||= reflect_on_association(name)
end

def value_as_sql(value)
  if value.respond_to?(:to_sql)
    value.to_sql
  else
    value
  end
end