Updated examples with the suggested MongoMapper :inverse_of syntax

gistfile1.md

We use inverse_of in three ways in Mongoid. I've attempted to translate the way we currently use inverse_of in Mongoid to the @bkeepers inverse_of syntax:

2. Update: use :class_name to specify the class and :inverse_of to specify the inverse association if the :class_name and :inverse_of association can not be inferred from the association definition.

To declare multiple associations to the same model.

I believe :inverse_of and :class_name can be inferred in the trivial case where the field name equals the class or collection name.

class Profile
  include MongoMapper::Document

  many :administrates,  :class_name => "Event", :inverse_of => :admins
  many :reservations,   :class_name => "Event", :inverse_of => :guests
end

class Event
  include MongoMapper::Document

  many :admins,   :class_name => Profile, :inverse_of => :administrates
  many :guests,   :class_name => Profile, :inverse_of => :reservations
end

The array storing the variables could be "#{self.model_name}_#{association_field_name}_ids".

3. Update: use :class_name to specify the class and :inverse_of to specify the inverse association if needed.

To change the name of an association to something more informative in the context, like e.g:

This becomes the same as number 2 in the many-to-many association. For the many-to-one association it can be:

class Profile
  include MongoMapper::Document

  many :reviews_of_me,   :class_name => "Review", :inverse_of => :review_of
end

class Review
  include MongoMapper::Document

  belongs_to :review_of, :class_name => Profile, :inverse_of => :reviews_of_me
end

---

1. Update: :inverse_of not needed

To declare multiple fields using the same embedded model, like e.g:

class Profile
  include MongoMapper::Document

  many :i_am_a,     :class_name => 'TagInteraction'
  many :i_love_to,  :class_name => 'TagInteraction'
end

class TagInteraction
  include MongoMapper::EmbeddedDocument
  
end

This could apply to anything that has different uses of the same concept, like e.g labels and reviews.