class CanCan::ModelAdapters::AbstractAdapter

def self.adapter_class(model_class) 

def self.adapter_class(model_class)
  @subclasses.detect { |subclass| subclass.for_class?(model_class) } || DefaultAdapter
end

def self.find(model_class, id)

Override if you need custom find behavior 
def self.find(model_class, id)
  model_class.find(id)
end

def self.for_class?(_member_class)

Used to determine if the given adapter should be used for the passed in class. 
def self.for_class?(_member_class)
  false # override in subclass
end

def self.inherited(subclass) 

def self.inherited(subclass)
  @subclasses ||= []
  @subclasses.insert(0, subclass)
end

def self.matches_condition?(_subject, _name, _value)

Override if override_condition_matching? returns true 
def self.matches_condition?(_subject, _name, _value)
  raise NotImplemented, 'This model adapter does not support matching on a specific condition.'
end

def self.matches_conditions_hash?(_subject, _conditions)

Override if override_conditions_hash_matching? returns true 
def self.matches_conditions_hash?(_subject, _conditions)
  raise NotImplemented, 'This model adapter does not support matching on a conditions hash.'
end

def self.nested_subject_matches_conditions?(_parent, _child, _all_conditions)

Override if override_nested_subject_conditions_matching? returns true 
def self.nested_subject_matches_conditions?(_parent, _child, _all_conditions)
  raise NotImplemented, 'This model adapter does not support matching on a nested subject.'
end

def self.override_condition_matching?(_subject, _name, _value)

If this returns true then matches_condition? will be called. See Rule#matches_conditions_hash
Used to determine if this model adapter will override the matching behavior for a specific condition. 
def self.override_condition_matching?(_subject, _name, _value)
  false
end

def self.override_conditions_hash_matching?(_subject, _conditions)

If this returns true then matches_conditions_hash? will be called. See Rule#matches_conditions_hash
Used to determine if this model adapter will override the matching behavior for a hash of conditions. 
def self.override_conditions_hash_matching?(_subject, _conditions)
  false
end

def self.override_nested_subject_conditions_matching?(_parent, _child, _all_conditions)

If this returns true then nested_subject_matches_conditions? will be called.
matching behavior for nested subject.
Used above override_conditions_hash_matching to determine if this model adapter will override the 
def self.override_nested_subject_conditions_matching?(_parent, _child, _all_conditions)
  false
end

def self.parent_condition_name(parent, _child)

Override if parent condition could be under a different key in conditions 
def self.parent_condition_name(parent, _child)
  parent.class.name.downcase.to_sym
end

def database_records 

def database_records
  # This should be overridden in a subclass to return records which match @rules
  raise NotImplemented, 'This model adapter does not support fetching records from the database.'
end

def initialize(model_class, rules) 

def initialize(model_class, rules)
  @model_class = model_class
  @rules = rules
end