Class: ActiveFedora::Associations::DirectlyContainsOneAssociation

Inherits:
SingularAssociation show all
Defined in:
lib/active_fedora/associations/directly_contains_one_association.rb

Overview

Filters a DirectContainer relationship, returning the first item that matches the given :type

Instance Attribute Summary

Attributes inherited from Association

#inversed, #owner, #reflection, #target

Instance Method Summary collapse

Methods inherited from SingularAssociation

#build, #create, #create!, #reader, #writer

Methods inherited from Association

#association_scope, #initialize, #load_target, #loaded!, #loaded?, #reload, #reset, #reset_scope, #scope, #set_inverse_instance, #stale_target?, #target_scope

Constructor Details

This class inherits a constructor from ActiveFedora::Associations::Association

Instance Method Details

#add_to_container(record) ⇒ Object

Adds record to the DirectContainer identified by the container_association Relies on container_association.initialize_attributes to appropriately set things like record.uri



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# File 'lib/active_fedora/associations/directly_contains_one_association.rb', line 26

def add_to_container(record)
  container_association.add_to_target(record) # adds record to corresponding Container
  # TODO is send necessary?
  container_association.send(:initialize_attributes, record) # Uses the :through association initialize the record with things like the correct URI for a direclty contained object
end

#find_target ⇒ Object

Finds objects contained by the container predicate (either the configured has_member_relation or ldp:contains) TODO: Refactor this to use solr (for efficiency) instead of parsing the RDF graph. Requires indexing ActiveFedora::File objects into solr, including their RDF.type and, if possible, the id of their container



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# File 'lib/active_fedora/associations/directly_contains_one_association.rb', line 7

def find_target
  # filtered_objects = container_association_proxy.to_a.select { |o| o.metadata_node.type.include?(options[:type]) }
  query_node = if container_predicate = options[:has_member_relation]
                 owner
               else
                 container_predicate = ::RDF::Vocab::LDP.contains
                 container_association.container # Use the :through association's container
               end

  contained_uris = query_node.resource.query(predicate: container_predicate).map { |r| r.object.to_s }
  contained_uris.each do |object_uri|
    contained_object = klass.find(klass.uri_to_id(object_uri))
    return contained_object if get_type_from_record(contained_object).include?(options[:type])
  end
  nil # if nothing was found & returned while iterating on contained_uris, return nil
end

#replace(record) ⇒ Object

Replaces association target with record Ensures that this association’s type is set on the record and adds the record to the association’s DirectContainer



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# File 'lib/active_fedora/associations/directly_contains_one_association.rb', line 34

def replace(record, *)
  if record
    raise_on_type_mismatch!(record)
    remove_existing_target
    add_type_to_record(record, options[:type])
    add_to_container(record)
  else
    remove_existing_target
  end

  self.target = record
end

#updated? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_fedora/associations/directly_contains_one_association.rb', line 47

def updated?
  @updated
end