Fun On Rails: A ruby and rails blog

Mongoid embeded_in and Array field management

by sandipransing 0 comments

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

Read More…

mongoid array field and rails form

by sandipransing 0 comments

mongoid document supports array as field. array field in mongoid document is a ruby array but its quite complex to manage array field in rails forms.
After lot of google and reading comments from stack-overflow at last i felt helpless. Finally after doing research on rails form helper object(form_for, fields_for) am pleased to get it working as expected :)
In below example, product can have multiple categories


class Product
  CATEGORIES = %w(Apparel Media Software Sports Agri Education)
  include Mongoid::Document
  field :name, :type => String
  field :categories, :type => Array
end

Here is form code


= form_for(@product) do |f|
  = f.text_field :name
  - Product::CATEGORIES.each do |category|
    = f.check_box :categories, :name => "product[categories][]", category

Here is products controller code


class ProductsController < ApplicationController
  before_filter :load_product, :only => [:new, :create]
  
  [...]
  
  # We don't need new action to be defined
  
  def create
    @product.attributes = params[:product]
    # Here we need to reject blank categories
    @product.categories.reject!(&:blank?)
    if @product.save
      flash[:notice] = I18n.t('product.create.success')
      redirect_to(:action => :index)
    else
      render :action => :new
    end
  end
  
  [...]
  
  private
  def load_product
    @product = Product.new
  end
end

Read More…