Module: Redgraph::NodeModel::ClassMethods

Defined in:
lib/redgraph/node_model/class_methods.rb

Instance Method Summary collapse

Instance Method Details

#all(label: nil, properties: {}, limit: nil, skip: nil, order: nil) ⇒ Object

Returns an array of nodes. Options:

  • label: filter by label

  • properties: filter by properties

  • order: node.name ASC, node.year DESC

  • limit: number of items

  • skip: items offset (useful for pagination)



12
13
14
15
16
17
 
# File 'lib/redgraph/node_model/class_methods.rb', line 12

def all(label: nil, properties: {}, limit: nil, skip: nil, order: nil)
  graph.nodes(label: label, properties: properties_plus_type(properties),
              limit: limit, skip: skip, order: nil).map do |node|
    reify_from_node(node)
  end
end

#count(label: nil, properties: nil) ⇒ Object

Returns the number of nodes with the current label. Options:

  • properties: filter by properties



23
24
25
 
# File 'lib/redgraph/node_model/class_methods.rb', line 23

def count(label: nil, properties: nil)
  graph.count_nodes(label: label, properties: properties_plus_type(properties))
end

#create(properties) ⇒ Object 



68
69
70
 
# File 'lib/redgraph/node_model/class_methods.rb', line 68

def create(properties)
  new(**properties).add_to_graph
end

#find(id) ⇒ Object

Finds a node by id. Returns nil if not found



29
30
31
32
33
 
# File 'lib/redgraph/node_model/class_methods.rb', line 29

def find(id)
  node = graph.find_node_by_id(id)
  return unless node
  reify_from_node(node)
end

#label ⇒ Object

Current label



42
43
44
 
# File 'lib/redgraph/node_model/class_methods.rb', line 42

def label
  @label ||= default_label
end

#label=(x) ⇒ Object

Sets the label for this class of nodes. If missing it will be computed from the class name



36
37
38
 
# File 'lib/redgraph/node_model/class_methods.rb', line 36

def label=(x)
  @label = x
end

#query(cmd) ⇒ Object

Runs a query on the graph, but converts the nodes to the corresponding ActiveModel class if available - otherwise they stay NodeObjects.

Returns an array of rows.

Raises:



58
59
60
61
62
63
64
65
66
 
# File 'lib/redgraph/node_model/class_methods.rb', line 58

def query(cmd)
  raise MissingGraphError unless graph

  graph.query(cmd).map do |row|
    row.map do |item|
      item.is_a?(Node) ? reify_from_node(item) : item
    end
  end
end

#reify_from_node(node) ⇒ Object

Converts a Node object into NodeModel



48
49
50
51
 
# File 'lib/redgraph/node_model/class_methods.rb', line 48

def reify_from_node(node)
  klass = node.properties[:_type].to_s.safe_constantize || self
  klass.new(id: node.id, **node.properties)
end