Module: ActiveGraph::Relationship::Query::ClassMethods

Defined in:
lib/active_graph/relationship/query.rb

Instance Method Summary collapse

Instance Method Details

#all ⇒ Object

Performs a basic match on the relationship, returning all results. This is not executed lazily, it will immediately return matching objects.



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# File 'lib/active_graph/relationship/query.rb', line 37

def all
  all_query.pluck(:r1)
end

#find(id) ⇒ Object

Returns the object with the specified neo4j id.

Parameters:

  • id (String) —

    of node to find



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# File 'lib/active_graph/relationship/query.rb', line 10

def find(id)
  fail "Unknown argument #{id.class} in find method (expected String)" unless [Integer, String].any?(&id.method(:is_a?))
  find_by_id(id) || fail(RecordNotFound.new("Couldn't find #{name} with 'id'=#{id.inspect}", name, id))
end

#find_by(args) ⇒ Object 



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# File 'lib/active_graph/relationship/query.rb', line 31

def find_by(args)
  where(args).first
end

#find_by_id(key) ⇒ Object

Loads the relationship using its neo_id.



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# File 'lib/active_graph/relationship/query.rb', line 16

def find_by_id(key)
  query = ActiveGraph::Base.new_query
  result = query.match('()-[r]-()').where("r.#{id_property_name}" => key).limit(1).return(:r).first
  result&.send(:[], :r)
end

#first ⇒ Object 



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# File 'lib/active_graph/relationship/query.rb', line 41

def first
  all_query.limit(1).order('r1.created_at').pluck(:r1).first
end

#last ⇒ Object 



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# File 'lib/active_graph/relationship/query.rb', line 45

def last
  all_query.limit(1).order('r1.created_at DESC').pluck(:r1).first
end

#where(args = {}) ⇒ Object

Performs a very basic match on the relationship. This is not executed lazily, it will immediately return matching objects. To use a string, prefix the property with “r1”

Examples:

Match with a string

MyRelClass.where('r1.grade > r1')


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# File 'lib/active_graph/relationship/query.rb', line 27

def where(args = {})
  where_query.where(where_string(args)).pluck(:r1)
end