Module: ActiveFedora::RelationshipsHelper
- Defined in:
- lib/active_fedora/relationships_helper.rb
Overview
This module is meant to extend semantic node to add functionality based on a relationship’s name It is meant to turn a relationship into just another attribute in a model. The notion of a “relationship name” is used internally to distinguish between the relationships you’ve set up using has_relationship and the implicit relationships that are based on the predicates themselves.
Defined Under Namespace
Modules: ClassMethods
Class Method Summary collapse
Instance Method Summary collapse
-
#add_named_relationship(name, object) ⇒ Object
deprecated
Deprecated.
Please use #add_relationship_by_name instead.
-
#add_relationship_by_name(name, object) ⇒ Boolean
** EXPERIMENTAL **.
-
#assert_conforms_to(name, object, model_class) ⇒ Object
** EXPERIMENTAL **.
-
#assert_kind_of_model(name, object, model_class) ⇒ Object
deprecated
Deprecated.
Please use #assert_conforms_to instead.
-
#class_from_name(name) ⇒ Class
Returns a Class symbol for the given string for the class name.
-
#conforms_to?(model_class) ⇒ Boolean
** EXPERIMENTAL **.
-
#find_relationship_by_name(name) ⇒ Array
** EXPERIMENTAL **.
-
#inbound_named_relationship_predicates ⇒ Object
deprecated
Deprecated.
Please use #inbound_relationship_predicates instead.
-
#inbound_relationship_names ⇒ Array
** EXPERIMENTAL **.
-
#inbound_relationship_predicates ⇒ Hash
** EXPERIMENTAL **.
-
#inbound_relationships_by_name ⇒ Hash
** EXPERIMENTAL **.
-
#is_named_relationship?(name, outbound_only = true) ⇒ Boolean
deprecated
Deprecated.
Please use #is_relationship_name? instead.
-
#is_relationship_name?(name, outbound_only = true) ⇒ Boolean
** EXPERIMENTAL **.
-
#kind_of_model?(model_class) ⇒ Boolean
deprecated
Deprecated.
Please use #conforms_to? instead.
-
#named_inbound_relationships ⇒ Object
deprecated
Deprecated.
Please use #inbound_relationships_by_name instead.
-
#named_outbound_relationships ⇒ Object
deprecated
Deprecated.
Please use #outbound_relationships_by_name instead.
-
#named_relationship(name) ⇒ Object
deprecated
Deprecated.
Please use #find_relationship_by_name instead.
-
#named_relationship_predicates ⇒ Object
deprecated
Deprecated.
Please use #relationship_predicates instead.
-
#named_relationship_predicates_from_class ⇒ Object
deprecated
Deprecated.
Please use #relationship_predicates_from_class instead.
-
#named_relationship_query(relationship_name) ⇒ Object
deprecated
Deprecated.
Please use #relationship_query instead.
-
#named_relationship_type(name) ⇒ Object
deprecated
Deprecated.
Please use #relationship_model_type instead.
-
#named_relationships(outbound_only = true) ⇒ Object
deprecated
Deprecated.
Please use #relationships_by_name instead.
-
#named_relationships_desc ⇒ Object
deprecated
Deprecated.
Please use #relationships_desc instead.
-
#named_relationships_desc_from_class ⇒ Object
deprecated
Deprecated.
Please use #relationships_desc_from_class instead.
-
#named_relationships_from_class ⇒ Object
deprecated
Deprecated.
Please use #relationships_by_name_from_class instead.
-
#outbound_named_relationship_predicates ⇒ Object
deprecated
Deprecated.
Please use #outbound_relationship_predicates instead.
-
#outbound_relationship_names ⇒ Array
** EXPERIMENTAL **.
-
#outbound_relationship_predicates ⇒ Hash
** EXPERIMENTAL **.
-
#outbound_relationships_by_name ⇒ Hash
** EXPERIMENTAL **.
-
#register_named_relationship(subject, name, predicate, opts) ⇒ Object
deprecated
Deprecated.
Please use #register_relationship_desc instead.
-
#register_named_subject(subject) ⇒ Object
deprecated
Deprecated.
Please use #register_relationship_desc_subject instead.
-
#register_relationship_desc(subject, name, predicate, opts = {}) ⇒ Object
** EXPERIMENTAL **.
-
#register_relationship_desc_subject(subject) ⇒ Object
Internal method that ensures a relationship subject such as :self and :inbound exist within the relationships_desc hash tracking relationships metadata.
-
#relationship_model_type(name) ⇒ Class
** EXPERIMENTAL **.
-
#relationship_names ⇒ Array
** EXPERIMENTAL **.
-
#relationship_predicates ⇒ Hash
** EXPERIMENTAL **.
-
#relationship_predicates_from_class ⇒ Hash
** EXPERIMENTAL **.
-
#relationship_query(relationship_name) ⇒ String
Call this method to return the query used against solr to retrieve any objects linked via the relationship name given.
-
#relationships_by_name(outbound_only = true) ⇒ Hash
** EXPERIMENTAL **.
-
#relationships_by_name_from_class ⇒ Hash
** EXPERIMENTAL **.
-
#relationships_desc ⇒ Hash
** EXPERIMENTAL **.
-
#relationships_desc_from_class ⇒ Hash
** EXPERIMENTAL **.
-
#remove_named_relationship(name, object) ⇒ Object
deprecated
Deprecated.
Please use #remove_relationship_by_name instead.
-
#remove_relationship_by_name(name, object) ⇒ Boolean
** EXPERIMENTAL **.
Class Method Details
.included(klass) ⇒ Object
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# File 'lib/active_fedora/relationships_helper.rb', line 29 def self.included(klass) klass.extend(ClassMethods) end |
Instance Method Details
#add_named_relationship(name, object) ⇒ Object
Please use #add_relationship_by_name instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 520 def add_named_relationship(name,object) logger.warn("Deprecation: add_named_relationship has been deprecated. Please call add_relationship_by_name instead.") add_relationship_by_name(name,object) end |
#add_relationship_by_name(name, object) ⇒ Boolean
** EXPERIMENTAL **
Add an outbound relationship for given relationship name See ActiveFedora::SemanticNode::ClassMethods.has_relationship
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# File 'lib/active_fedora/relationships_helper.rb', line 270 def add_relationship_by_name(name, object) if is_relationship_name?(name,true) if relationships_desc[:self][name].has_key?(:type) klass = class_from_name(relationships_desc[:self][name][:type]) unless klass.nil? (assert_conforms_to 'object', object, klass) end end #r = ActiveFedora::Relationship.new({:subject=>:self,:predicate=>outbound_relationship_predicates[name],:object=>object}) #add_relationship(r) add_relationship(outbound_relationship_predicates[name],object) else false end end |
#assert_conforms_to(name, object, model_class) ⇒ Object
** EXPERIMENTAL **
Throws an assertion error if conforms_to? returns false for object and model_class
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# File 'lib/active_fedora/relationships_helper.rb', line 306 def assert_conforms_to(name, object, model_class) raise "Assertion failure: #{name}: #{object.pid} does not have model #{model_class}, it has model #{relationships[:self][:has_model]}" unless object.conforms_to?(model_class) end |
#assert_kind_of_model(name, object, model_class) ⇒ Object
Please use #assert_conforms_to instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 532 def assert_kind_of_model(name,object,model_class) logger.warn("Deprecation: assert_kind_of_model has been deprecated. Please call assert_conforms_to instead.") assert_conforms_to(name,object,model_class) end |
#class_from_name(name) ⇒ Class
Returns a Class symbol for the given string for the class name
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# File 'lib/active_fedora/relationships_helper.rb', line 342 def class_from_name(name) klass = name.to_s.split('::').inject(Kernel) {|scope, const_name| scope.const_get(const_name)} (!klass.nil? && klass.is_a?(::Class)) ? klass : nil end |
#conforms_to?(model_class) ⇒ Boolean
** EXPERIMENTAL **
Checks that this object is matches the model class passed in. It requires two steps to pass to return true
1. It has a hasModel relationship of the same model
2. kind_of? returns true for the model passed in
This method can most often be used to detect if an object from Fedora that was created with a different model was then used to populate this object.
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# File 'lib/active_fedora/relationships_helper.rb', line 320 def conforms_to?(model_class) if self.kind_of?(model_class) #check has model and class match if relationships[:self].has_key?(:has_model) r = ActiveFedora::Relationship.new(:subject=>:self, :predicate=>:has_model, :object=>ActiveFedora::ContentModel.pid_from_ruby_class(self.class)) if relationships[:self][:has_model].first.to_s.eql?(r.object.to_s) return true else raise "has_model relationship check failed for model #{model_class} raising exception, expected: '#{r.object.to_s}' actual: '#{relationships[:self][:has_model].to_s}'" end else raise "has_model relationship does not exist for model #{model_class} check raising exception" end else raise "kind_of? check failed for model #{model_class}, actual #{self.class} raising exception" end return false end |
#find_relationship_by_name(name) ⇒ Array
** EXPERIMENTAL **
Return array of objects for a given relationship name
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# File 'lib/active_fedora/relationships_helper.rb', line 39 def find_relationship_by_name(name) rels = nil if inbound_relationship_names.include?(name) rels = relationships_by_name(false)[:inbound][name] elsif outbound_relationship_names.include?(name) rels = relationships_by_name[:self][name] end rels = [] if rels.nil? return rels end |
#inbound_named_relationship_predicates ⇒ Object
Please use #inbound_relationship_predicates instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 478 def inbound_named_relationship_predicates logger.warn("Deprecation: inbound_named_relationship_predicates has been deprecated. Please call inbound_relationship_predicates instead.") inbound_relationship_predicates end |
#inbound_relationship_names ⇒ Array
** EXPERIMENTAL **
Return array of relationship names for all inbound relationships (coming from other objects’ RELS-EXT and Solr)
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# File 'lib/active_fedora/relationships_helper.rb', line 192 def inbound_relationship_names relationships_desc.has_key?(:inbound) ? relationships_desc[:inbound].keys : [] end |
#inbound_relationship_predicates ⇒ Hash
** EXPERIMENTAL **
Return hash of inbound relationship names and predicate pairs
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# File 'lib/active_fedora/relationships_helper.rb', line 146 def inbound_relationship_predicates relationship_predicates.has_key?(:inbound) ? relationship_predicates[:inbound] : {} end |
#inbound_relationships_by_name ⇒ Hash
** EXPERIMENTAL **
Return hash of relationships_by_name defined within other objects’ RELS-EXT It returns a hash of relationship name to arrays of objects. It requeries solr each time this method is called.
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# File 'lib/active_fedora/relationships_helper.rb', line 120 def inbound_relationships_by_name rels = {} if relationships_desc.has_key?(:inbound)&&!relationships_desc[:inbound].empty?() inbound_rels = inbound_relationships if relationship_predicates.has_key?(:inbound) relationship_predicates[:inbound].each do |name, predicate| rels[name] = inbound_rels.has_key?(predicate) ? inbound_rels[predicate] : [] end end end return rels end |
#is_named_relationship?(name, outbound_only = true) ⇒ Boolean
Please use #is_relationship_name? instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 496 def is_named_relationship?(name, outbound_only=true) logger.warn("Deprecation: is_named_relationship? has been deprecated. Please call is_relationship_name? instead.") is_relationship_name?(name,outbound_only) end |
#is_relationship_name?(name, outbound_only = true) ⇒ Boolean
** EXPERIMENTAL **
Returns true if the given relationship name is a relationship
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# File 'lib/active_fedora/relationships_helper.rb', line 218 def is_relationship_name?(name, outbound_only=true) if outbound_only outbound_relationship_names.include?(name) else (outbound_relationship_names.include?(name)||inbound_relationship_names.include?(name)) end end |
#kind_of_model?(model_class) ⇒ Boolean
Please use #conforms_to? instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 538 def kind_of_model?(model_class) logger.warn("Deprecation: kind_of_model? has been deprecated. Please call conforms_to? instead.") conforms_to?(model_class) end |
#named_inbound_relationships ⇒ Object
Please use #inbound_relationships_by_name instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 460 def named_inbound_relationships logger.warn("Deprecation: named_inbound_relationships has been deprecated. Please call inbound_relationships_by_name instead.") inbound_relationships_by_name end |
#named_outbound_relationships ⇒ Object
Please use #outbound_relationships_by_name instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 466 def named_outbound_relationships logger.warn("Deprecation: named_outbound_relationships has been deprecated. Please call outbound_relationships_by_name instead.") outbound_relationships_by_name end |
#named_relationship(name) ⇒ Object
Please use #find_relationship_by_name instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 430 def named_relationship(name) logger.warn("Deprecation: named_relationship has been deprecated. Please call find_relationship_by_name instead.") find_relationship_by_name(name) end |
#named_relationship_predicates ⇒ Object
Please use #relationship_predicates instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 484 def named_relationship_predicates logger.warn("Deprecation: named_relationship_predicates has been deprecated. Please call relationship_predicates instead.") relationship_predicates end |
#named_relationship_predicates_from_class ⇒ Object
Please use #relationship_predicates_from_class instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 490 def named_relationship_predicates_from_class logger.warn("Deprecation: named_relationship_predicates_from_class has been deprecated. Please call relationship_predicates_from_class instead.") relationship_predicates_from_class end |
#named_relationship_query(relationship_name) ⇒ Object
Please use #relationship_query instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 544 def named_relationship_query(relationship_name) logger.warn("Deprecation: named_relationship_query has been deprecated. Please call relationship_query instead.") relationship_query(relationship_name) end |
#named_relationship_type(name) ⇒ Object
Please use #relationship_model_type instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 514 def named_relationship_type(name) logger.warn("Deprecation: named_relationship_type has been deprecated. Please call relationship_model_type instead.") relationship_model_type(name) end |
#named_relationships(outbound_only = true) ⇒ Object
Please use #relationships_by_name instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 448 def named_relationships(outbound_only=true) logger.warn("Deprecation: named_relationships has been deprecated. Please call relationships_by_name instead.") relationships_by_name(outbound_only) end |
#named_relationships_desc ⇒ Object
Please use #relationships_desc instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 502 def named_relationships_desc logger.warn("Deprecation: named_relationships_desc has been deprecated. Please call relationships_desc instead.") relationships_desc end |
#named_relationships_desc_from_class ⇒ Object
Please use #relationships_desc_from_class instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 508 def named_relationships_desc_from_class logger.warn("Deprecation: named_relationships_desc_from_class has been deprecated. Please call relationships_desc_from_class instead.") relationships_desc_from_class end |
#named_relationships_from_class ⇒ Object
Please use #relationships_by_name_from_class instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 454 def named_relationships_from_class logger.warn("Deprecation: named_relationships_from_class has been deprecated. Please call relationships_by_name_from_class instead.") relationships_by_name_from_class end |
#outbound_named_relationship_predicates ⇒ Object
Please use #outbound_relationship_predicates instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 472 def outbound_named_relationship_predicates logger.warn("Deprecation: outbound_named_relationship_predicates has been deprecated. Please call outbound_relationship_predicates instead.") outbound_relationship_predicates end |
#outbound_relationship_names ⇒ Array
** EXPERIMENTAL **
Return array of relationship names for all outbound relationships (coming from this object’s RELS-EXT)
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# File 'lib/active_fedora/relationships_helper.rb', line 200 def outbound_relationship_names relationships_desc.has_key?(:self) ? relationships_desc[:self].keys : [] end |
#outbound_relationship_predicates ⇒ Hash
** EXPERIMENTAL **
Return hash of outbound relationship names and predicate pairs
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# File 'lib/active_fedora/relationships_helper.rb', line 138 def outbound_relationship_predicates relationship_predicates.has_key?(:self) ? relationship_predicates[:self] : {} end |
#outbound_relationships_by_name ⇒ Hash
** EXPERIMENTAL **
Return hash of relationships_by_name defined within this object’s RELS-EXT It returns a hash of relationship name to arrays of objects
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# File 'lib/active_fedora/relationships_helper.rb', line 209 def outbound_relationships_by_name relationships_desc.has_key?(:self) ? relationships_by_name[:self] : {} end |
#register_named_relationship(subject, name, predicate, opts) ⇒ Object
Please use #register_relationship_desc instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 442 def register_named_relationship(subject, name, predicate, opts) logger.warn("Deprecation: register_named_relationship has been deprecated. Please call register_relationship_desc instead.") register_relationship_desc(subject, name, predicate, opts) end |
#register_named_subject(subject) ⇒ Object
Please use #register_relationship_desc_subject instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 436 def register_named_subject(subject) logger.warn("Deprecation: register_named_subject has been deprecated. Please call register_relationship_desc_subject instead.") register_relationship_desc_subject(subject) end |
#register_relationship_desc(subject, name, predicate, opts = {}) ⇒ Object
** EXPERIMENTAL **
Internal method that adds a relationship description for a relationship name and predicate pair to either an outbound (:self) or inbound (:inbound) relationship types. This method just calls the class method counterpart of this method.
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# File 'lib/active_fedora/relationships_helper.rb', line 69 def register_relationship_desc(subject, name, predicate, opts={}) self.class.register_relationship_desc(subject, name, predicate, opts) end |
#register_relationship_desc_subject(subject) ⇒ Object
Internal method that ensures a relationship subject such as :self and :inbound exist within the relationships_desc hash tracking relationships metadata. This method just calls the class method counterpart of this method.
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# File 'lib/active_fedora/relationships_helper.rb', line 56 def register_relationship_desc_subject(subject) self.class.register_relationship_desc_subject(subject) end |
#relationship_model_type(name) ⇒ Class
** EXPERIMENTAL **
Return the value of :type for the relationship for name passed in if defined It defaults to ActiveFedora::Base.
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# File 'lib/active_fedora/relationships_helper.rb', line 253 def relationship_model_type(name) if is_relationship_name?(name,true) subject = outbound_relationship_names.include?(name)? :self : :inbound if relationships_desc[subject][name].has_key?(:type) return class_from_name(relationships_desc[subject][name][:type]) end end return nil end |
#relationship_names ⇒ Array
** EXPERIMENTAL **
Return array all relationship names
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# File 'lib/active_fedora/relationships_helper.rb', line 180 def relationship_names names = [] relationships_desc.each_key do |subject| names = names.concat(relationships_desc[subject].keys) end names end |
#relationship_predicates ⇒ Hash
** EXPERIMENTAL **
Return hash of relationship names and predicate pairs (inbound and outbound). This method calls the class method version of this method to get the static settings defined in the class definition.
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# File 'lib/active_fedora/relationships_helper.rb', line 156 def relationship_predicates @relationship_predicates ||= relationship_predicates_from_class end |
#relationship_predicates_from_class ⇒ Hash
** EXPERIMENTAL **
Return hash of relationship names and predicate pairs from class. It retrieves this information via the relationships_desc hash in the class.
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# File 'lib/active_fedora/relationships_helper.rb', line 165 def relationship_predicates_from_class rels = {} relationships_desc.each_pair do |subj, names| rels[subj] = {} names.each_pair do |name, args| rels[subj][name] = args[:predicate] end end return rels end |
#relationship_query(relationship_name) ⇒ String
Call this method to return the query used against solr to retrieve any objects linked via the relationship name given.
Instead of this method you can also use the helper method [relationship_name]_query, i.e. method “parts_query” for relationship “parts” to return the same value
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# File 'lib/active_fedora/relationships_helper.rb', line 369 def relationship_query(relationship_name) query = "" if self.class.is_bidirectional_relationship?(relationship_name) id_array = [] predicate = outbound_relationship_predicates["#{relationship_name}_outbound"] if !outbound_relationships[predicate].nil? outbound_relationships[predicate].each do |rel| id_array << rel.gsub("info:fedora/", "") end end query = self.class.bidirectional_relationship_query(pid,relationship_name,id_array) elsif outbound_relationship_names.include?(relationship_name) id_array = [] predicate = outbound_relationship_predicates[relationship_name] if !outbound_relationships[predicate].nil? outbound_relationships[predicate].each do |rel| id_array << rel.gsub("info:fedora/", "") end end query = self.class.outbound_relationship_query(relationship_name,id_array) elsif inbound_relationship_names.include?(relationship_name) query = self.class.inbound_relationship_query(pid,relationship_name) end query end |
#relationships_by_name(outbound_only = true) ⇒ Hash
** EXPERIMENTAL **
Gets the relationships hash with subject mapped to relationship names instead of relationship predicates (unlike the “relationships” method in SemanticNode) It has an optional parameter of outbound_only that defaults true. If false it will include inbound relationships in the results. Also, it will only reload outbound relationships if the relationships hash has changed since the last time this method was called.
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# File 'lib/active_fedora/relationships_helper.rb', line 83 def relationships_by_name(outbound_only=true) #make sure to update if relationships have been updated if @relationships_are_dirty == true @relationships_by_name = relationships_by_name_from_class() @relationships_are_dirty = false end #this will get called normally on first fetch if relationships are not dirty @relationships_by_name ||= relationships_by_name_from_class() outbound_only ? @relationships_by_name : @relationships_by_name.merge(:inbound=>inbound_relationships_by_name) end |
#relationships_by_name_from_class ⇒ Hash
** EXPERIMENTAL **
Gets relationships by name from the class using the current relationships hash and relationship name,predicate pairs.
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# File 'lib/active_fedora/relationships_helper.rb', line 100 def relationships_by_name_from_class() rels = {} relationship_predicates.each_pair do |subj, names| if relationships.has_key?(subj) rels[subj] = {} names.each_pair do |name, predicate| rels[subj][name] = (relationships[subj].has_key?(predicate) ? relationships[subj][predicate] : []) end end end return rels end |
#relationships_desc ⇒ Hash
** EXPERIMENTAL **
Return hash that persists relationship metadata defined by has_relationship calls
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# File 'lib/active_fedora/relationships_helper.rb', line 236 def relationships_desc @relationships_desc ||= relationships_desc_from_class end |
#relationships_desc_from_class ⇒ Hash
** EXPERIMENTAL **
Get class instance variable relationships_desc that holds has_relationship metadata
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# File 'lib/active_fedora/relationships_helper.rb', line 244 def relationships_desc_from_class self.class.relationships_desc end |
#remove_named_relationship(name, object) ⇒ Object
Please use #remove_relationship_by_name instead.
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# File 'lib/active_fedora/relationships_helper.rb', line 526 def remove_named_relationship(name,object) logger.warn("Deprecation: remove_named_relationship has been deprecated. Please call remove_relationship_by_name instead.") remove_relationship_by_name(name,object) end |
#remove_relationship_by_name(name, object) ⇒ Boolean
** EXPERIMENTAL **
Remove an object for the given relationship name
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# File 'lib/active_fedora/relationships_helper.rb', line 292 def remove_relationship_by_name(name, object) if is_relationship_name?(name,true) remove_relationship(outbound_relationship_predicates[name],object) else return false end end |