Class: RedisOrm::Base

Inherits:
Object
  • Object
show all
Extended by:
Associations::BelongsTo, Associations::HasMany, Associations::HasOne
Includes:
ActiveModel::Validations, ActiveModelBehavior, Associations::HasManyHelper, Utils
Defined in:
lib/redis_orm/redis_orm.rb

Constant Summary collapse

@@properties = 
Hash.new{|h,k| h[k] = []}
@@indices =

compound indices are available too

Hash.new{|h,k| h[k] = []}
@@associations = 
Hash.new{|h,k| h[k] = []}
@@callbacks = 
Hash.new{|h,k| h[k] = {}}
@@use_uuid_as_id = 
{}
@@descendants = 
[]
@@expire = 
Hash.new{|h,k| h[k] = {}}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Associations::BelongsTo

belongs_to

Methods included from Associations::HasMany

has_many

Methods included from Associations::HasOne

has_one

Methods included from Utils

#calculate_key_for_zset

Methods included from ActiveModelBehavior

included

Constructor Details

#initialize(attributes = {}, id = nil, persisted = false) ⇒ Base

Returns a new instance of Base.



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# File 'lib/redis_orm/redis_orm.rb', line 465

def initialize(attributes = {}, id = nil, persisted = false)
  @persisted = persisted

  # if this model uses uuid then id is a string otherwise it should be casted to Integer class
  id = @@use_uuid_as_id[model_name] ? id : id.to_i

  instance_variable_set(:"@id", id) if id

  # when object is created with empty attribute set @#{prop[:name]}_changes array properly
  @@properties[model_name].each do |prop|
    if prop[:options][:default]
      instance_variable_set :"@#{prop[:name]}_changes", [prop[:options][:default]]
    else
      instance_variable_set :"@#{prop[:name]}_changes", []
    end
  end

  # cast all attributes' keys to symbols
  attributes = attributes.inject({}){|sum, el| sum.merge({el[0].to_sym => el[1]})} if attributes.is_a?(Hash)

  # get all names of properties to assign only those attributes from attributes hash whose key are in prop_names 
  # we're not using *self.respond_to?("#{key}=".to_sym)* since *belongs_to* and other assocs could create their own methods 
  # with *key=* name, that in turn will mess up indices
  if attributes.is_a?(Hash) && !attributes.empty?        
    @@properties[model_name].each do |property|
      if !(value = attributes[property[:name]]).nil? # check for nil because we want to pass falses too (and value could be 'false')
        value = Marshal.load(value) if ["Array", "Hash"].include?(property[:class]) && value.is_a?(String)
        self.send("#{property[:name]}=".to_sym, value)
      end
    end
  end
  self
end

Instance Attribute Details

#persisted ⇒ Object

Returns the value of attribute persisted.



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# File 'lib/redis_orm/redis_orm.rb', line 48

def persisted
  @persisted
end

Class Method Details

.after_create(callback) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 351

def after_create(callback)        
  @@callbacks[model_name][:after_create] << callback
end

.after_destroy(callback) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 359

def after_destroy(callback)
  @@callbacks[model_name][:after_destroy] << callback
end

.after_save(callback) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 343

def after_save(callback)        
  @@callbacks[model_name][:after_save] << callback
end

.all(options = {}) ⇒ Object

TODO refactor this messy function



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# File 'lib/redis_orm/redis_orm.rb', line 198

def all(options = {})
  limit = if options[:limit] && options[:offset]
    [options[:offset].to_i, options[:limit].to_i]
  elsif options[:limit]
    [0, options[:limit].to_i]
  else
    [0, -1]
  end
  
  order_max_limit = Time.now.to_f
  ids_key = "#{model_name}:ids"
  index = nil

  prepared_index = if !options[:conditions].blank? && options[:conditions].is_a?(Hash)
    properties = options[:conditions].collect{|key, value| key}
    
    # if some condition includes object => get only the id of this object
    conds = options[:conditions].inject({}) do |sum, item|
      key, value = item
      if value.respond_to?(:model_name)
        sum.merge!({key => value.id})
      else
        sum.merge!({key => value})
      end
    end

    index = find_indices(properties, {first: true})
    
    raise NotIndexFound if !index

    construct_prepared_index(index, conds)
  else
    if options[:order] && options[:order].is_a?(Array)
      model_name
    else
      ids_key
    end
  end

  order_by_property_is_string = false
  
  # if not array => created_at native order (in which ids were pushed to "#{model_name}:ids" set by default)
  direction = if !options[:order].blank?
    property = {}
    dir = if options[:order].is_a?(Array)
      property = @@properties[model_name].detect{|prop| prop[:name].to_s == options[:order].first.to_s}
      # for String values max limit for search key could be 1.0, but for Numeric values there's actually no limit
      order_max_limit = 100_000_000_000
      ids_key = "#{prepared_index}:#{options[:order].first}_ids"
      options[:order].size == 2 ? options[:order].last : 'asc'
    else
      property = @@properties[model_name].detect{|prop| prop[:name].to_s == options[:order].to_s}
      ids_key = prepared_index
      options[:order]
    end
    if property && property[:class].eql?("String") && property[:options][:sortable]
      order_by_property_is_string = true
    end
    dir
  else
    ids_key = prepared_index
    'asc'
  end
  
  if order_by_property_is_string
    if direction.to_s == 'desc'
      ids_length = $redis.llen(ids_key)
      limit = if options[:offset] && options[:limit]
        [(ids_length - options[:offset].to_i - options[:limit].to_i), (ids_length - options[:offset].to_i - 1)]
      elsif options[:limit]
        [ids_length - options[:limit].to_i, ids_length]
      elsif options[:offset]
        [0, (ids_length - options[:offset].to_i - 1)]
      else
        [0, -1]
      end
      $redis.lrange(ids_key, *limit).reverse.compact.collect{|id| find(id.split(':').last)}
    else
      limit = if options[:offset] && options[:limit]
        [options[:offset].to_i, (options[:offset].to_i + options[:limit].to_i)]
      elsif options[:limit]
        [0, options[:limit].to_i - 1]
      elsif options[:offset]
        [options[:offset].to_i, -1]
      else
        [0, -1]
      end
      $redis.lrange(ids_key, *limit).compact.collect{|id| find(id.split(':').last)}
    end
  else
    if index && index[:options][:unique]
      id = $redis.get prepared_index
      model_name.to_s.camelize.constantize.find(id)
    else
      if direction.to_s == 'desc'
        $redis.zrevrangebyscore(ids_key, order_max_limit, 0, :limit => limit).compact.collect{|id| find(id)}
      else
        $redis.zrangebyscore(ids_key, 0, order_max_limit, :limit => limit).compact.collect{|id| find(id)}
      end
    end
  end
end

.before_create(callback) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 355

def before_create(callback)
  @@callbacks[model_name][:before_create] << callback
end

.before_destroy(callback) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 363

def before_destroy(callback)        
  @@callbacks[model_name][:before_destroy] << callback
end

.before_save(callback) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 347

def before_save(callback)        
  @@callbacks[model_name][:before_save] << callback
end

.construct_prepared_index(index, conditions_hash) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 178

def construct_prepared_index(index, conditions_hash)
  prepared_index = model_name.to_s
 
  # in order not to depend on order of keys in *:conditions* hash we rather interate over the index itself and find corresponding values in *:conditions* hash
  if index[:name].is_a?(Array)
    index[:name].each do |key|
      # raise if User.find_by_firstname_and_castname => there's no *castname* in User's properties
      raise ArgumentsMismatch if !@@properties[model_name].detect{|p| p[:name] == key.to_sym}
      prepared_index += ":#{key}:#{conditions_hash[key]}"
    end
  else
    prepared_index += ":#{index[:name]}:#{conditions_hash[index[:name]]}"
  end
        
  prepared_index.downcase! if index[:options][:case_insensitive]
  
  prepared_index
end

.count ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 142

def count
  $redis.zcard("#{model_name}:ids").to_i
end

.create(options = {}) ⇒ Object Also known as: create! 



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# File 'lib/redis_orm/redis_orm.rb', line 367

def create(options = {})
  obj = new(options, nil, false)
  obj.save

  # make possible binding related models while creating class instance
  options.each do |k, v|
    if @@associations[model_name].detect{|h| h[:foreign_model] == k || h[:options][:as] == k}
      obj.send("#{k}=", v)
    end
  end
  
  $redis.expire(obj.__redis_record_key, options[:expire_in].to_i) if !options[:expire_in].blank?

  obj
end

.descendants ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 68

def descendants
  @@descendants
end

.expire(seconds, options = {}) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 133

def expire(seconds, options = {})
  @@expire[model_name] = {seconds: seconds, options: options}
end

.find(*args) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 301

def find(*args)
  if args.first.is_a?(Array)
    return [] if args.first.empty?
    args.first.inject([]) do |array, id|
      record = $redis.hgetall "#{model_name}:#{id}"
      if record && !record.empty?
        array << new(record, id, true)
      end
    end
  else
    return nil if args.empty? || args.first.nil?
    case first = args.shift
      when :all
        options = args.last
        options = {} if !options.is_a?(Hash)
        all(options)
      when :first
        options = args.last
        options = {} if !options.is_a?(Hash)
        all(options.merge({:limit => 1}))[0]
      when :last
        options = args.last
        options = {} if !options.is_a?(Hash)
        reversed = options[:order] == 'desc' ? 'asc' : 'desc'
        all(options.merge({:limit => 1, :order => reversed}))[0]
      else
        id = first
        record = $redis.hgetall "#{model_name}:#{id}"
        record && record.empty? ? nil : new(record, id, true)
    end
  end        
end

.find!(*args) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 334

def find!(*args)
  result = find(*args)
  if result.nil?
    raise RecordNotFound
  else
    result
  end
end

.find_indices(properties, options = {}) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 164

def find_indices(properties, options = {})
  properties.map!{|p| p.to_sym}
  method = options[:first] ? :detect : :select
  
  @@indices[model_name].send(method) do |models_index|
    if models_index[:name].is_a?(Array) && models_index[:name].size == properties.size
      # check the elements not taking into account their order
      (models_index[:name] & properties).size == properties.size
    elsif !models_index[:name].is_a?(Array) && properties.size == 1
      models_index[:name] == properties[0]
    end
  end
end

.first(options = {}) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 146

def first(options = {})
  if options.empty?
    id = $redis.zrangebyscore("#{model_name}:ids", 0, Time.now.to_f, :limit => [0, 1])
    id.empty? ? nil : find(id[0])
  else
    find(:first, options)
  end
end

.index(name, options = {}) ⇒ Object

options currently supports

*unique* Boolean
*case_insensitive* Boolean



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# File 'lib/redis_orm/redis_orm.rb', line 75

def index(name, options = {})
  @@indices[model_name] << {:name => name, :options => options}
end

.inherited(from) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 60

def inherited(from)
  [:after_save, :before_save, :after_create, :before_create, :after_destroy, :before_destroy].each do |callback_name|
    @@callbacks[from.model_name][callback_name] = []
  end
  
  @@descendants << from
end

.last(options = {}) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 155

def last(options = {})
  if options.empty?
    id = $redis.zrevrangebyscore("#{model_name}:ids", Time.now.to_f, 0, :limit => [0, 1])
    id.empty? ? nil : find(id[0])
  else
    find(:last, options)
  end
end

.method_missing(method_name, *args, &block) ⇒ Object

dynamic finders



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# File 'lib/redis_orm/redis_orm.rb', line 386

def method_missing(method_name, *args, &block)
  if method_name =~ /^find_(all_)?by_(\w*)/
    
    index = if $2
      properties = $2.split('_and_')
      raise ArgumentsMismatch if properties.size != args.size
      properties_hash = {}
      properties.each_with_index do |prop, i| 
        properties_hash.merge!({prop.to_sym => args[i]})
      end
      find_indices(properties, :first => true)
    end

    raise NotIndexFound if !index
    
    prepared_index = construct_prepared_index(index, properties_hash)

    if method_name =~ /^find_by_(\w*)/
      id = if index[:options][:unique]            
        $redis.get prepared_index
      else
        $redis.zrangebyscore(prepared_index, 0, Time.now.to_f, :limit => [0, 1])[0]
      end
      model_name.to_s.camelize.constantize.find(id)
    elsif method_name =~ /^find_all_by_(\w*)/
      records = []          

      if index[:options][:unique]            
        id = $redis.get prepared_index
        records << model_name.to_s.camelize.constantize.find(id)
      else
        ids = $redis.zrangebyscore(prepared_index, 0, Time.now.to_f)
        records += model_name.to_s.camelize.constantize.find(ids)
      end          

      records
    else
      nil
    end
  end
end

.property(property_name, class_name, options = {}) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 79

def property(property_name, class_name, options = {})
  @@properties[model_name] << {:name => property_name, :class => class_name.to_s, :options => options}

  send(:define_method, property_name) do
    value = instance_variable_get(:"@#{property_name}")

    return nil if value.nil? # we must return nil here so :default option will work when saving, otherwise it'll return "" or 0 or 0.0
    if /DateTime|Time/ =~ class_name.to_s            
      # we're using to_datetime here because to_time doesn't manage timezone correctly
      value.to_s.to_datetime rescue nil
    elsif Integer == class_name
      value.to_i
    elsif Float == class_name
      value.to_f
    elsif RedisOrm::Boolean == class_name
      ((value == "false" || value == false) ? false : true)
    else
      value
    end
  end
    
  send(:define_method, "#{property_name}=".to_sym) do |value|
    if instance_variable_get(:"@#{property_name}_changes") && !instance_variable_get(:"@#{property_name}_changes").empty?
      initial_value = instance_variable_get(:"@#{property_name}_changes")[0]
      instance_variable_set(:"@#{property_name}_changes", [initial_value, value])
    elsif instance_variable_get(:"@#{property_name}")
      instance_variable_set(:"@#{property_name}_changes", [self.send(property_name), value])
    else
      instance_variable_set(:"@#{property_name}_changes", [value])
    end
    instance_variable_set(:"@#{property_name}", value)
  end
  
  send(:define_method, "#{property_name}_changes".to_sym) do
    instance_variable_get(:"@#{property_name}_changes")
  end
  
  send(:define_method, "#{property_name}_changed?".to_sym) do
    instance_variable_get(:"@#{property_name}_changes").size > 1
  end
end

.timestamps ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 121

def timestamps
  #if !@@properties[model_name].detect{|p| p[:name] == :created_at && p[:class] == "Time"}
  if !instance_methods.include?(:created_at) && !instance_methods.include?(:"created_at=")
    property :created_at, Time
  end
  
  #if !@@properties[model_name].detect{|p| p[:name] == :modified_at && p[:class] == "Time"}
  if !instance_methods.include?(:modified_at) && !instance_methods.include?(:"modified_at=")
    property :modified_at, Time
  end
end

.use_uuid_as_id ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 137

def use_uuid_as_id
  @@use_uuid_as_id[model_name] = true
  @@uuid = UUID.new
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 517

def ==(other)
  raise "this object could be comparable only with object of the same class" if other.class != self.class
  same = true
  @@properties[model_name].each do |prop|
    self_var = instance_variable_get(:"@#{prop[:name]}")
    same = false if other.send(prop[:name]).to_s != self_var.to_s
  end
  same = false if self.id != other.id
  same
end

#__redis_record_key ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 435

def __redis_record_key
  "#{model_name}:#{id}"
end

#destroy ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 631

def destroy
  @@callbacks[model_name][:before_destroy].each do |callback|
    self.send(callback)
  end

  @@properties[model_name].each do |prop|
    property_value = instance_variable_get(:"@#{prop[:name]}").to_s
    $redis.hdel("#{model_name}:#{@id}", prop[:name].to_s)
    
    if prop[:options][:sortable]
      if prop[:class].eql?("String")
        $redis.lrem "#{model_name}:#{prop[:name]}_ids", 1, "#{property_value}:#{@id}"
      else
        $redis.zrem "#{model_name}:#{prop[:name]}_ids", @id
      end
    end
  end

  $redis.zrem "#{model_name}:ids", @id

  # also we need to delete *indices* of associated records
  if !@@associations[model_name].empty?
    @@associations[model_name].each do |assoc|        
      if :belongs_to == assoc[:type]
        # if assoc has :as option
        foreign_model_name = assoc[:options][:as] ? assoc[:options][:as].to_sym : assoc[:foreign_model].to_sym
        
        if !self.send(foreign_model_name).nil?
          @@indices[model_name].each do |index|
            keys_to_delete = if index[:name].is_a?(Array)
              full_index = index[:name].inject([]){|sum, index_part| sum << index_part}.join(':')
              $redis.keys "#{foreign_model_name}:#{self.send(foreign_model_name).id}:#{model_name.to_s.pluralize}:#{full_index}:*"
            else
              ["#{foreign_model_name}:#{self.send(foreign_model_name).id}:#{model_name.to_s.pluralize}:#{index[:name]}:#{self.send(index[:name])}"]
            end
            keys_to_delete.each do |key| 
              index[:options][:unique] ? $redis.del(key) : $redis.zrem(key, @id)
            end
          end
        end
      end
    end
  end
  
  # also we need to delete *links* to associated records
  if !@@associations[model_name].empty?
    @@associations[model_name].each do |assoc|

      foreign_model  = ""
      records = []

      case assoc[:type]
        when :belongs_to
          foreign_model = assoc[:foreign_model].to_s
          foreign_model_name = assoc[:options][:as] ? assoc[:options][:as] : assoc[:foreign_model]
          if assoc[:options][:polymorphic]
            records << self.send(foreign_model_name)
            # get real foreign_model's name in order to delete backlinks properly
            foreign_model = $redis.get("#{model_name}:#{id}:#{foreign_model_name}_type")
            $redis.del("#{model_name}:#{id}:#{foreign_model_name}_type")
            $redis.del("#{model_name}:#{id}:#{foreign_model_name}_id")
          else
            records << self.send(foreign_model_name)
            $redis.del "#{model_name}:#{@id}:#{assoc[:foreign_model]}"
          end
        when :has_one
          foreign_model = assoc[:foreign_model].to_s
          foreign_model_name = assoc[:options][:as] ? assoc[:options][:as] : assoc[:foreign_model]
          records << self.send(foreign_model_name)

          $redis.del "#{model_name}:#{@id}:#{assoc[:foreign_model]}"
        when :has_many
          foreign_model = assoc[:foreign_models].to_s.singularize
          foreign_models_name = assoc[:options][:as] ? assoc[:options][:as] : assoc[:foreign_models]
          records += self.send(foreign_models_name)

          # delete all members             
          $redis.zremrangebyscore "#{model_name}:#{@id}:#{assoc[:foreign_models]}", 0, Time.now.to_f
      end

      # check whether foreign_model also has an assoc to the destroying record
      # and remove an id of destroing record from each of associated sets
      if !records.compact.empty?
        records.compact.each do |record|
          # we make 3 different checks rather then 1 with elsif to ensure that all associations will be processed
          # it's covered in test/option_test in "should delete link to associated record when record was deleted" scenario
          # for if class Album; has_one :photo, :as => :front_photo; has_many :photos; end
          # end some photo from the album will be deleted w/o these checks only first has_one will be triggered
          if @@associations[foreign_model].detect{|h| h[:type] == :belongs_to && h[:foreign_model] == model_name.to_sym}
            $redis.del "#{foreign_model}:#{record.id}:#{model_name}"
          end

          if @@associations[foreign_model].detect{|h| h[:type] == :has_one && h[:foreign_model] == model_name.to_sym}
            $redis.del "#{foreign_model}:#{record.id}:#{model_name}"
          end

          if @@associations[foreign_model].detect{|h| h[:type] == :has_many && h[:foreign_models] == model_name.pluralize.to_sym}
            $redis.zrem "#{foreign_model}:#{record.id}:#{model_name.pluralize}", @id
          end
        end
      end

      if assoc[:options][:dependent] == :destroy
        if !records.compact.empty?
          records.compact.each do |r|
            r.destroy
          end
        end
      end
    end
  end

  # remove all associated indices
  @@indices[model_name].each do |index|
    prepared_index = _construct_prepared_index(index) # instance method not class one!

    if index[:options][:unique]
      $redis.del(prepared_index)
    else
      $redis.zremrangebyscore(prepared_index, 0, Time.now.to_f)
    end
  end

  @@callbacks[model_name][:after_destroy].each do |callback|
    self.send(callback)
  end

  true # if there were no errors just return true, so *if* conditions would work
end

#find_position_to_insert(sortable_key, value) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 576

def find_position_to_insert(sortable_key, value)
  end_index = $redis.llen(sortable_key)

  return 0 if end_index == 0
  
  start_index = 0
  pivot_index = end_index / 2

  start_el = $redis.lindex(sortable_key, start_index)
  end_el   = $redis.lindex(sortable_key, end_index - 1)
  pivot_el = $redis.lindex(sortable_key, pivot_index)

  while start_index != end_index
    # aa..ab..ac..bd <- ad
    if start_el.split(':').first > value # Michael > Abe
      return 0
    elsif end_el.split(':').first < value # Abe < Todd 
      return end_el
    elsif start_el.split(':').first == value # Abe == Abe
      return start_el
    elsif pivot_el.split(':').first == value # Todd == Todd
      return pivot_el
    elsif end_el.split(':').first == value
      return end_el
    elsif (start_el.split(':').first < value) && (pivot_el.split(':').first > value)
      start_index = start_index
      prev_pivot_index = pivot_index
      pivot_index = start_index + ((end_index - pivot_index) / 2)
      end_index   = prev_pivot_index
    elsif (pivot_el.split(':').first < value) && (end_el.split(':').first > value) # M < V && Y > V
      start_index = pivot_index
      pivot_index = pivot_index + ((end_index - pivot_index) / 2)
      end_index   = end_index          
    end
    start_el = $redis.lindex(sortable_key, start_index)
    end_el   = $redis.lindex(sortable_key, end_index - 1)
    pivot_el = $redis.lindex(sortable_key, pivot_index)
  end
  start_el
end

#get_associations ⇒ Object

is called from RedisOrm::Associations::HasMany to save backlinks to saved records



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# File 'lib/redis_orm/redis_orm.rb', line 456

def get_associations
  @@associations[self.model_name]
end

#get_indices ⇒ Object

is called from RedisOrm::Associations::HasMany to correctly save indices for associated records



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# File 'lib/redis_orm/redis_orm.rb', line 461

def get_indices
  @@indices[self.model_name]
end

#get_next_id ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 532

def get_next_id
  if @@use_uuid_as_id[model_name]
    @@uuid.generate(:compact)
  else
    $redis.incr("#{model_name}:id")
  end
end

#id ⇒ Object Also known as: to_key 



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# File 'lib/redis_orm/redis_orm.rb', line 499

def id
  @id
end

#persisted? ⇒ Boolean

Returns:



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# File 'lib/redis_orm/redis_orm.rb', line 528

def persisted?
  @persisted
end

#save ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 540

def save
  return false if !valid?

  _check_mismatched_types_for_values
  
  # store here initial persisted flag so we could invoke :after_create callbacks in the end of *save* function
  was_persisted = persisted?

  if persisted? # then there might be old indices
    _check_indices_for_persisted # remove old indices if needed
  else # !persisted?        
    @@callbacks[model_name][:before_create].each{ |callback| self.send(callback) }
 
    @id = get_next_id
    $redis.zadd "#{model_name}:ids", Time.now.to_f, @id
    @persisted = true
    self.created_at = Time.now if respond_to? :created_at
  end

  @@callbacks[model_name][:before_save].each{ |callback| self.send(callback) }

  # automatically update *modified_at* property if it was defined
  self.modified_at = Time.now if respond_to? :modified_at

  _save_to_redis # main work done here
  _save_new_indices

  @@callbacks[model_name][:after_save].each{ |callback| self.send(callback) }

  if ! was_persisted
    @@callbacks[model_name][:after_create].each{ |callback| self.send(callback) }
  end

  true # if there were no errors just return true, so *if obj.save* conditions would work
end

#set_expire_on_reference_key(key) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 439

def set_expire_on_reference_key(key)
  class_expire = @@expire[model_name]

  # if class method *expire* was invoked and number of seconds was specified then set expiry date on the HSET record key
  if class_expire[:seconds]
    set_expire = true

    if class_expire[:options][:if] && class_expire[:options][:if].class == Proc
      # *self* here refers to the instance of class which has_one association
      set_expire = class_expire[:options][:if][self]  # invoking specified *:if* Proc with current record as *self* 
    end

    $redis.expire(key, class_expire[:seconds].to_i) if set_expire
  end
end

#to_a ⇒ Object

could be invoked from has_many module (<< method)



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# File 'lib/redis_orm/redis_orm.rb', line 431

def to_a
  [self]
end

#to_s ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 505

def to_s
  inspected = "<#{model_name.capitalize} id: #{@id}, "
  inspected += @@properties[model_name].inject([]) do |sum, prop|
    property_value = instance_variable_get(:"@#{prop[:name]}")
    property_value = '"' + property_value.to_s + '"' if prop[:class].eql?("String")
    property_value = 'nil' if property_value.nil?
    sum << "#{prop[:name]}: " + property_value.to_s
  end.join(', ')
  inspected += ">"
  inspected
end

#update_attribute(attribute_name, attribute_value) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 626

def update_attribute(attribute_name, attribute_value)
  self.send("#{attribute_name}=".to_sym, attribute_value) if self.respond_to?("#{attribute_name}=".to_sym)
  save
end

#update_attributes(attributes) ⇒ Object 



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# File 'lib/redis_orm/redis_orm.rb', line 617

def update_attributes(attributes)
  if attributes.is_a?(Hash)
    attributes.each do |key, value|
      self.send("#{key}=".to_sym, value) if self.respond_to?("#{key}=".to_sym)
    end
  end
  save
end