Module: Neo4j::ActiveNode::Scope::ClassMethods

Defined in:
lib/neo4j/active_node/scope.rb

Instance Method Summary collapse

Instance Method Details

#_call_scope_context(eval_context, query_params, proc) ⇒ Object 



70
71
72
73
74
75
76
 
# File 'lib/neo4j/active_node/scope.rb', line 70

def _call_scope_context(eval_context, query_params, proc)
  if proc.arity == 1
    eval_context.instance_exec(query_params, &proc)
  else
    eval_context.instance_exec(&proc)
  end
end

#all(new_var = nil) ⇒ Object 



87
88
89
90
91
92
93
94
 
# File 'lib/neo4j/active_node/scope.rb', line 87

def all(new_var = nil)
  var = new_var || (current_scope ? current_scope.node_identity : :n)
  if current_scope
    current_scope.new_link(var)
  else
    self.as(var)
  end
end

#current_scope ⇒ Object

:nodoc:



79
80
81
 
# File 'lib/neo4j/active_node/scope.rb', line 79

def current_scope #:nodoc:
  ScopeRegistry.value_for(:current_scope, base_class.to_s)
end

#current_scope=(scope) ⇒ Object

:nodoc:



83
84
85
 
# File 'lib/neo4j/active_node/scope.rb', line 83

def current_scope=(scope) #:nodoc:
  ScopeRegistry.set_value_for(:current_scope, base_class.to_s, scope)
end

#full_scopes ⇒ Object 



66
67
68
 
# File 'lib/neo4j/active_node/scope.rb', line 66

def full_scopes
  scopes.merge(self.superclass.respond_to?(:scopes) ? self.superclass.scopes : {})
end

#has_scope?(name) ⇒ Boolean

rubocop:disable Style/PredicateName

Returns:



51
52
53
54
55
 
# File 'lib/neo4j/active_node/scope.rb', line 51

def has_scope?(name)
  ActiveSupport::Deprecation.warn 'has_scope? is deprecated and may be removed from future releases, use scope? instead.', caller

  scope?(name)
end

#scope(name, proc) ⇒ Object

Similar to ActiveRecord scope

Examples:

without argument

class Person
  include Neo4j::ActiveNode
  property :name
  property :score
  has_many :out, :friends, type: :has_friend, model_class: self
  scope :top_students, -> { where(score: 42)}") }
end
Person.top_students.to_a
a_person.friends.top_students.to_a
a_person.friends.friends.top_students.to_a
a_person.friends.top_students.friends.to_a

Argument for scopes

Person.scope :level, ->(num) { where(level_num: num)}

Argument as a cypher identifier

class Person
  include Neo4j::ActiveNode
  property :name
  property :score
  has_many :out, :friends, type: :has_friend, model_class: self
  scope :great_students, ->(identifier) { where("#{identifier}.score > 41") }
end
Person.as(:all_people).great_students(:all_people).to_a

See Also:



37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/neo4j/active_node/scope.rb', line 37

def scope(name, proc)
  scopes[name.to_sym] = proc

  klass = class << self; self; end
  klass.instance_eval do
    define_method(name) do |query_params = nil, _ = nil|
      eval_context = ScopeEvalContext.new(self, current_scope || self.query_proxy)
      proc = full_scopes[name.to_sym]
      _call_scope_context(eval_context, query_params, proc)
    end
  end
end

#scope?(name) ⇒ Boolean

rubocop:enable Style/PredicateName

Returns:



58
59
60
 
# File 'lib/neo4j/active_node/scope.rb', line 58

def scope?(name)
  full_scopes.key?(name.to_sym)
end

#scopes ⇒ Object 



62
63
64
 
# File 'lib/neo4j/active_node/scope.rb', line 62

def scopes
  @scopes ||= {}
end