Previous post explains on mongoid document array field and rails form implementation
Below example shows rails form integration of array field of embedded mongoid document
consider scenario, student embeds one family who has many assets
class Student
include Mongoid::Document
field :name
field :phone
embeds_one :family
validates_associated :family
accepts_nested_attributes_for :family
end
class Family
include Mongoid::Document
ASSETS = ['flat', 'car', 'business', 'bunglow', 'cash']
field :members, type: Integer
field :assets, type: Array
field :religon
embedded_in :student
end
Brief controller code
class StudentsController < ApplicationController
def new
@student = Student.new
@student.family ||= @student.build_family
end
def create
@student = Student.new(params[:student])
@student.family.assets.reject!(&:blank?)
if @student.save
[...]
else
render :action => :new
end
end
end
view form will look like-
= form_for(@student) do |s|
= s.text_field :name
= s.text_field :phone
- s.fields_for :family do |f|
= f.text_field :members
= f.text_field :religion
- Family::ASSETS.each do |asset|
/Here f.object_name #=> student[family]
= f.check_box :assets, :name => "#{f.object_name}[assets][]", asset
