Module: RedisOrm::Associations::HasOne

Included in:
Base
Defined in:
lib/redis_orm/associations/has_one.rb

Instance Method Summary collapse

Instance Method Details

#has_one(foreign_model, options = {}) ⇒ Object

user.avatars => user:1:avatars => [1, 22, 234] => Avatar.find([1, 22, 234]) options is a hash and can hold:

*:as* key
*:dependant* key: either *destroy* or *nullify* (default)



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# File 'lib/redis_orm/associations/has_one.rb', line 8

def has_one(foreign_model, options = {})
  class_associations = class_variable_get(:"@@associations")
  class_associations[model_name] << {:type => :has_one, :foreign_model => foreign_model, :options => options}

  foreign_model_name = if options[:as]
    options[:as].to_sym
  else
    foreign_model.to_sym
  end

  if options[:index]
    class_variable_get(:"@@indices")[model_name] << {:name => foreign_model_name, :options => {:reference => true}}
  end
  
  define_method foreign_model_name do
    foreign_model.to_s.camelize.constantize.find($redis.get "#{model_name}:#{@id}:#{foreign_model_name}")
  end     

  # profile = Profile.create :title => 'test'
  # user.profile = profile => user:23:profile => 1
  define_method "#{foreign_model_name}=" do |assoc_with_record|
    # we need to store this to clear old associations later
    old_assoc = self.send(foreign_model_name)

    reference_key = "#{model_name}:#{id}:#{foreign_model_name}"
    if assoc_with_record.nil?
      $redis.del(reference_key)
    elsif assoc_with_record.model_name == foreign_model.to_s
      $redis.set(reference_key, assoc_with_record.id)
      set_expire_on_reference_key(reference_key)
    else
      raise TypeMismatchError
    end
    
    # handle indices for references
    self.get_indices.select{|index| index[:options][:reference]}.each do |index|
      # delete old reference that points to the old associated record
      if !old_assoc.nil?
        prepared_index = [self.model_name, index[:name], old_assoc.id].join(':')
        prepared_index.downcase! if index[:options][:case_insensitive]

        if index[:options][:unique]
          $redis.del(prepared_index, id)
        else
          $redis.zrem(prepared_index, id)
        end
      end
      
      # if new associated record is nil then skip to next index (since old associated record was already unreferenced)
      next if assoc_with_record.nil?
      
      prepared_index = [self.model_name, index[:name], assoc_with_record.id].join(':')

      prepared_index.downcase! if index[:options][:case_insensitive]

      if index[:options][:unique]
        $redis.set(prepared_index, id)
      else
        $redis.zadd(prepared_index, Time.now.to_f, id)
      end
    end

    if !options[:as]
      if assoc_with_record.nil?
        # remove old assoc
        $redis.zrem("#{old_assoc.model_name}:#{old_assoc.id}:#{model_name.to_s.pluralize}", id) if old_assoc
      else
        # check whether *assoc_with_record* object has *belongs_to* declaration and TODO it states *self.model_name* and there is no record yet from the *assoc_with_record*'s side (in order not to provoke recursion)
        if class_associations[assoc_with_record.model_name].detect{|h| [:belongs_to, :has_one].include?(h[:type]) && h[:foreign_model] == model_name.to_sym} && assoc_with_record.send(model_name.to_sym).nil?
          # old association is being rewritten here automatically so we don't have to worry about it
          assoc_with_record.send("#{model_name}=", self)
        elsif class_associations[assoc_with_record.model_name].detect{|h| :has_many == h[:type] && h[:foreign_models] == model_name.to_s.pluralize.to_sym} && !$redis.zrank("#{assoc_with_record.model_name}:#{assoc_with_record.id}:#{model_name.pluralize}", self.id)
          # remove old assoc
          $redis.zrem("#{old_assoc.model_name}:#{old_assoc.id}:#{model_name.to_s.pluralize}", id) if old_assoc
          # create/add new ones
          assoc_with_record.send(model_name.pluralize.to_sym).send(:"<<", self)
        end
      end
    end
  end
end