Module: Architect4r::Model::Queries::ClassMethods

Defined in:
lib/architect4r/model/queries.rb

Instance Method Summary collapse

Instance Method Details

#all ⇒ Object 



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# File 'lib/architect4r/model/queries.rb', line 55

def all
  find_by_cypher("start ModelRoot=node(#{self.model_root.id}) match ModelRoot<-[:model_type]-Item return Item", 'Item')
end

#count(opts = {}, &block) ⇒ Object 



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# File 'lib/architect4r/model/queries.rb', line 8

def count(opts = {}, &block)
  data = connection.execute_cypher("start s=node(#{self.model_root.id}) match (s)<-[:model_type]-(d) return count(d)")
  data['data'].flatten.first
end

#find(*ids) ⇒ Object Also known as: find_by_id

Fetch a record of the specified model based on its id



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# File 'lib/architect4r/model/queries.rb', line 15

def find(*ids)
  # This code is taken from / inspired by activerecord:
  #   activerecord/lib/active_record/base.rb, line 1589
  expects_array = ids.first.kind_of?(Array)
  return ids.first if expects_array && ids.first.empty?
  
  ids = ids.flatten.compact.uniq
  
  case ids.size
  when 0
    raise(Architect4r::RecordNotFound.new("Could not find the #{self.name} without an id!"))
  when 1
    id = ids.first.to_i
    data = connection.execute_cypher("start s=node(#{self.model_root.id}), d=node(#{id}) match s<-[r:model_type]-d return d")
    data &&= data['data'] && data['data'].flatten.first
    result = self.build_from_database(data)
    
    expects_array ? [ result ] : result
  else
    ids = ids.map { |i| i.to_i }.uniq.join(',')
    find_by_cypher("start s=node(#{self.model_root.id}), d=node(#{ids}) match s<-[r:model_type]-d return d", 'd')
  end
end

#find!(id) ⇒ Object Also known as: find_by_id! 



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# File 'lib/architect4r/model/queries.rb', line 40

def find!(id)
  self.find(id) || raise(Architect4r::RecordNotFound.new("Could not find the #{self.name} with id #{id}!"))
end

#find_by_cypher(query, identifier) ⇒ Object

Use this method only to fetch items of the same class.



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# File 'lib/architect4r/model/queries.rb', line 46

def find_by_cypher(query, identifier)
  if result_data = connection.execute_cypher(query)
    result_data = connection.transform_cypher_result_to_hash(result_data)
    result_data.map { |item| connection.convert_if_possible(item[identifier]) }
  else
    nil
  end
end