Module: Zermelo::Records::InstMethods

Included in:
Zermelo::Record
Defined in:
lib/zermelo/records/instance_methods.rb

Overview

module renamed to avoid ActiveSupport::Concern deprecation warning

Instance Method Summary collapse

Instance Method Details

#destroy ⇒ Object 



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# File 'lib/zermelo/records/instance_methods.rb', line 166

def destroy
  raise "Record was not persisted" unless persisted?

  run_callbacks :destroy do

    assoc_classes = self.class.send(:associated_classes)
    index_attrs   = self.class.send(:with_index_data) {|d| d.keys }

    self.class.lock(*assoc_classes) do
      self.class.send(:with_associations, self) do |assoc|
        assoc.send(:on_remove)
      end

      self.class.transaction do
        self.class.delete_id(@attributes['id'])
        index_attrs.each do |att|
          idx = self.class.send("#{att}_index")
          idx.delete_id( @attributes['id'], @attributes[att.to_s])
        end

        self.class.attribute_types.each_pair {|name, type|
          key = Zermelo::Records::Key.new(:klass => self.class,
            :id => self.id, :name => name.to_s, :type => type, :object => :attribute)
          backend.clear(key)
        }

        record_key = Zermelo::Records::Key.new(:klass => self.class,
            :id => self.id)
        backend.purge(record_key)
      end
    end
  end
end

#initialize(attrs = {}) ⇒ Object 



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# File 'lib/zermelo/records/instance_methods.rb', line 10

def initialize(attrs = {})
  @is_new = true
  @attributes = self.class.attribute_types.keys.inject({}) do |memo, ak|
    memo[ak.to_s] = attrs[ak]
    memo
  end
end

#key_dump ⇒ Object 



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# File 'lib/zermelo/records/instance_methods.rb', line 200

def key_dump
  inst_keys = []

  attr_key = attribute_keys.values.first
  unless attr_key.nil?
    inst_keys += [backend.key_to_backend_key(attr_key), attr_key]
  end

  self.class.send(:with_associations, self) do |assoc|
    inst_keys += assoc.key_dump
  end

  Hash[*inst_keys]
end

#load(id) ⇒ Object 



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# File 'lib/zermelo/records/instance_methods.rb', line 22

def load(id)
  self.id = id
  refresh
end

#persisted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zermelo/records/instance_methods.rb', line 18

def persisted?
  !@is_new
end

#refresh ⇒ Object 



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# File 'lib/zermelo/records/instance_methods.rb', line 27

def refresh
  # AM::Dirty -- private method 'clear_changes_information' in 4.2.0+,
  # private method 'reset_changes' in 4.1.0+, internal state before that
  if self.respond_to?(:clear_changes_information, true)
    clear_changes_information
  elsif self.respond_to?(:reset_changes, true)
    reset_changes
  else
    @previously_changed.clear unless @previously_changed.nil?
    @changed_attributes.clear
  end

  attr_types = self.class.attribute_types

  @attributes = {'id' => self.id}

  attrs = nil

  self.class.lock do
    class_key = self.class.send(:class_key)

    # TODO: check for record existence in backend-agnostic fashion
    # TODO fail if id not found
    @is_new = false

    attr_types = self.class.attribute_types.reject {|k, v| k == :id}

    attrs_to_load = attr_types.collect do |name, type|
      Zermelo::Records::Key.new(:klass => self.class,
        :id => self.id, :name => name, :type => type, :object => :attribute)
    end

    result = backend.get_multiple(*attrs_to_load)
    attrs = result[class_key][self.id] unless result.empty?
  end

  @attributes.update(attrs) unless attrs.nil? || attrs.empty?
  true
end

#save ⇒ Object 



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# File 'lib/zermelo/records/instance_methods.rb', line 160

def save
  save!
rescue Zermelo::Records::Errors::RecordInvalid, Zermelo::Records::Errors::RecordNotSaved
  false
end

#save! ⇒ Object

Raises:



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# File 'lib/zermelo/records/instance_methods.rb', line 78

def save!
  return unless @is_new || self.changed?
  self.id ||= self.class.generate_id
  raise Zermelo::Records::Errors::RecordInvalid.new(self) unless valid?

  creating = !self.persisted?
  saved = false

  sort_val = nil
  case self
  when Zermelo::Records::Ordered
    sort_attr = self.class.instance_variable_get('@sort_attribute')
    raise 'Ordered record types must define_sort_attribute' if sort_attr.nil?
    sort_val = @attributes[sort_attr.to_s]
    raise "Value required for sort_attribute #{sort_attr}" if sort_val.nil?
  end

  run_callbacks( (creating ? :create : :update) ) do

    idx_attrs = self.class.send(:with_index_data) do |d|
      d.each_with_object({}) do |(name, data), memo|
        memo[name.to_s] = data.index_klass
      end
    end

    self.class.transaction do

      apply_attribute = proc {|att, attr_key, old_new|
        backend.set(attr_key, old_new.last) unless att.eql?('id')

        if idx_attrs.has_key?(att)
          # update indices
          if creating
            self.class.send("#{att}_index").add_id( @attributes['id'], old_new.last)
          else
            self.class.send("#{att}_index").move_id( @attributes['id'], old_new.first,
                            self.class.send("#{att}_index"), old_new.last)
          end
        end
      }

      attr_keys = attribute_keys

      if creating
        attr_keys.each_pair do |att, attr_key|
          apply_attribute.call(att, attr_key, [nil, @attributes[att]])
        end
      else
        self.changes.each_pair do |att, old_new|
          apply_attribute.call(att, attr_keys[att], old_new)
        end
      end

      # ids is a set/sorted set, so update won't create duplicates
      # NB influxdb backend doesn't need this

      # FIXME distinguish between this in the class methods?
      case self
      when Zermelo::Records::Ordered
        self.class.add_id(@attributes['id'], sort_val)
      when Zermelo::Records::Unordered
        self.class.add_id(@attributes['id'])
      end
    end

    @is_new = false
    saved = true
  end

  raise Zermelo::Records::Errors::RecordNotSaved.new(self) unless saved

  # AM::Dirty -- private method in 4.1.0+, internal state before that
  if self.respond_to?(:changes_applied, true)
    changes_applied
  else
    @previously_changed = changes
    @changed_attributes.clear
  end

  true
end

#update_attributes(attributes = {}) ⇒ Object

TODO limit to only those attribute names defined in define_attributes



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# File 'lib/zermelo/records/instance_methods.rb', line 68

def update_attributes(attributes = {})
  attributes.each_pair do |att, v|
    unless value == @attributes[att.to_s]
      @attributes[att.to_s] = v
      send("#{att}_will_change!")
    end
  end
  save
end