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Contents
if defined?(Mongoid)
module Mongoid
# Helps to override find method in an embedded document.
# Usage :
# - add to your model "include Mongoid::EmbeddedFindable"
# - override find method with:
# def self.find(id)
# find_through(Book, 'chapter', id)
# end
module EmbeddedFindable
extend ActiveSupport::Concern
included do
# Search an embedded document by id.
#
# Document is stored within embedding_class collection, and can be accessed through provided relation.
# Also supports chained relationships (if the searched document is nested in several embedded documents)
#
# Example, with a chapter embedded in a book, the book being embedded in a library.
# use find_through(Library, "books", book_id) in Book class
# and find_through(Library, "books.chapters", chapter_id) in Chapter class
def self.find_through(embedding_class, relation, id = nil)
return nil if id.nil? || id.blank?
id = BSON::ObjectId.from_string(id) if id.is_a?(String)
relation = relation.to_s unless relation.is_a?(String)
relation_parts = relation.split('.')
parent = embedding_class.send(:all)
while relation_parts.length > 0
item = if parent.is_a?(Mongoid::Criteria) || parent.is_a?(Array)
parent.where("#{relation_parts.join('.')}._id" => id).first
else
parent
end
return nil if item.nil?
parent = item.send(relation_parts.shift)
end
if parent.is_a?(Mongoid::Criteria) || parent.is_a?(Array)
parent.where('_id' => id).first
else
parent
end
end
end
end
end
end
Version data entries
22 entries across 22 versions & 2 rubygems