Module: SimplyCouch::Model::HasAndBelongsToMany

Included in:
ClassMethods
Defined in:
lib/simply_couch/model/has_and_belongs_to_many.rb

Defined Under Namespace

Classes: Property

Instance Method Summary collapse

Instance Method Details

#define_has_and_belongs_to_many_after_destroy_cleanup(name, options) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 173

def define_has_and_belongs_to_many_after_destroy_cleanup(name, options)
  if options[:class_storing_keys] == self.name
    define_method "has_and_belongs_to_many_clean_up_after_destroy" do |property|
      nil # deleting is enough as we store the keys
    end
  else
    define_method "has_and_belongs_to_many_clean_up_after_destroy" do |property|
      send("remove_all_#{property.name}")
    end
  end
end

#define_has_and_belongs_to_many_count(name, options, through = nil) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 160

def define_has_and_belongs_to_many_count(name, options, through = nil)
  method_name = name.to_s.singularize.underscore.gsub('/', '__') + "_count"
  define_method(method_name) do |*args|
    local_options = args.first && args.first.is_a?(Hash) && args.first
    forced_reload, with_deleted, limit, descending = extract_association_options(local_options)

    if forced_reload || instance_variable_get("@#{method_name}").nil?
      instance_variable_set("@#{method_name}", count_associated_via_join_view(through || options[:class_name], self.class, :with_deleted => with_deleted, :foreign_key => options[:foreign_key]))
    end
    instance_variable_get("@#{method_name}")
  end
end

#define_has_and_belongs_to_many_getter(name, options) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 88

def define_has_and_belongs_to_many_getter(name, options)
  define_method(name) do |*args|
    local_options = args.first && args.first.is_a?(Hash) && args.first
    forced_reload, with_deleted, limit, descending, skip = extract_association_options(local_options)

    cached_results = send("_get_cached_#{name}")
    cache_key = _cache_key_for(local_options)
    return cached_results[cache_key] || [] unless persisted?
    if forced_reload || cached_results[cache_key].nil?
      cached_results[cache_key] = find_associated_via_join_view(options[:class_name], self.class, :with_deleted => with_deleted, :limit => limit, :descending => descending, :foreign_key => options[:foreign_key], :skip => skip)
      instance_variable_set("@#{name}", cached_results)
    end
    cached_results[cache_key]
  end
end

#define_has_and_belongs_to_many_property(foreign_key) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 9

def define_has_and_belongs_to_many_property(foreign_key)
  property foreign_key

  # Only allow non nil or empty values to be set
  define_method "#{foreign_key}=" do |value|
    super(value.is_a?(Array) ? value.select{|v| v.present?} : value)
  end
end

#define_has_and_belongs_to_many_setter_add(name, options) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 104

def define_has_and_belongs_to_many_setter_add(name, options)
  define_method("add_#{name.to_s.singularize}") do |value|
    klass = self.class.get_class_from_name(name)
    raise ArgumentError, "expected #{klass} got #{value.class}" unless value.is_a?(klass)

    if options[:class_storing_keys] == self.class.name
      self.send("#{options[:foreign_key]}=", ((send(options[:foreign_key]) || []) + [value.id]).uniq )
      self.save(false)
    else
      value.send("#{options[:foreign_key]}=", ((value.send(options[:foreign_key]) || []) + [self.id]).uniq )
      value.save(false)
    end

    cached_results = send("_get_cached_#{name}")[:all]
    send("_set_cached_#{name}", (cached_results || []) << value, :all)
    nil
  end
end

#define_has_and_belongs_to_many_setter_remove(name, options) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 123

def define_has_and_belongs_to_many_setter_remove(name, options)
  define_method "remove_#{name.to_s.singularize}" do |value|
    klass = self.class.get_class_from_name(name)
    raise ArgumentError, "expected #{klass} got #{value.class}" unless value.is_a?(klass)

    if options[:class_storing_keys] == self.class.name
      raise ArgumentError, "cannot remove not mine" unless (send(options[:foreign_key]) || []).include?(value.id)
    else
      raise ArgumentError, "cannot remove not mine" unless (value.send(options[:foreign_key]) || []).include?(id)
    end

    if options[:class_storing_keys] == self.class.name
      foreign_keys = (send(options[:foreign_key]) || []) - [value.id]
      send("#{options[:foreign_key]}=", foreign_keys)
      save(false)
    else
      foreign_keys = (value.send(options[:foreign_key]) || []) - [self.id]
      value.send("#{options[:foreign_key]}=", foreign_keys)
      value.save(false)
    end

    cached_results = send("_get_cached_#{name}")[:all]
    send("_set_cached_#{name}", (cached_results || []).delete_if{|item| item.id == value.id}, :all)
    nil
  end
end

#define_has_and_belongs_to_many_setter_remove_all(name, options) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 150

def define_has_and_belongs_to_many_setter_remove_all(name, options)
  define_method "remove_all_#{name}" do
    all = send("#{name}", :force_reload => true)

    all.collect{|i| i}.each do |item|
      send("remove_#{name.to_s.singularize}", item)
    end
  end
end

#define_has_and_belongs_to_many_views(name, options) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 18

def define_has_and_belongs_to_many_views(name, options)
  key_order = options[:class_storing_keys] == self.name ? "doc.#{options[:foreign_key]}[index], doc._id" : "doc._id, doc.#{options[:foreign_key]}[index]"
  value = options[:class_storing_keys] == self.name ? 1 : "{ _id :doc.#{options[:foreign_key]}[index]}"
  association_property = if name.to_s.index('__')
                           # Already defined properly
                           name
                         elsif options[:class_name].present?
                           # Determine namespace and replace last argument with given name
                           name_hierarchy = options[:class_name].to_s.underscore.split(/\/|::/)
                           name_hierarchy[-1] = name
                           name_hierarchy.join('__')
                         elsif rindex = foreign_property.to_s.rindex('__')
                           # Make name based on current namespace
                           "#{foreign_property[0...rindex]}__#{name}"
                         else
                           # Just return the good old name
                           name
                         end

  map_definition_without_deleted = <<-eos
    function(doc) {
      if (doc['ruby_class'] == '#{options[:class_storing_keys]}' && doc['#{options[:foreign_key]}'] != null) {
        if (doc['#{soft_delete_attribute}'] && doc['#{soft_delete_attribute}'] != null){
          // "soft" deleted
        }else{
          for (var index in doc.#{options[:foreign_key]}) {
            emit([#{key_order}], #{value});
          }
        }
      }
    }
  eos

  reduce_definition = options[:class_storing_keys] == self.name ? "_sum" : <<-eos
    function(key, values) {
      var sum = 0;
      for (var i in values){
        if (typeof(i) == 'number'){
          sum = sum + i;
        } else {
          sum = sum + 1;
        }
      }
      return sum;
    }
  eos

  view "association_#{foreign_property}_has_and_belongs_to_many_#{association_property}",
    :map_function => map_definition_without_deleted,
    :reduce_function => reduce_definition,
    :type => :custom,
    :include_docs => true

  map_definition_with_deleted = <<-eos
    function(doc) {
      if (doc['ruby_class'] == '#{options[:class_storing_keys]}' && doc['#{options[:foreign_key]}'] != null) {
        for (var index in doc.#{options[:foreign_key]}) {
          emit([#{key_order}], #{value});
        }
      }
    }
  eos

  view "association_#{self.name.underscore.gsub('/', '__')}_has_and_belongs_to_many_#{name}_with_deleted",
    :map_function => map_definition_with_deleted,
    :reduce_function => reduce_definition,
    :type => :custom,
    :include_docs => true
end

#has_and_belongs_to_many(name, options = {}) ⇒ Object 



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# File 'lib/simply_couch/model/has_and_belongs_to_many.rb', line 4

def has_and_belongs_to_many(name, options = {})
  check_existing_properties(name, SimplyCouch::Model::HasAndBelongsToMany::Property)
  properties << SimplyCouch::Model::HasAndBelongsToMany::Property.new(self, name, options)
end