This sample will cover about Strong Paramenter ##What I did
$ rails new strong_parameters
$ cd strong_parameters
$ rails g scaffold Product name:string description:string category_id:integer
$ rails g scaffold Category name:string
# and wrote some code...
##Setup
$ git clone https://github.com/kienbt01359/strong_parameters.git
$ cd strong_parameters
$ rake db:create
$ rake db:migrate
$ rails s##strong_parameters with single table
###Model
app/model/product.rb
class Product < ActiveRecord::Base
end ###Controller
app/controllers/products_controller.rb
before_action :set_product, only: [:show, :edit, :create, :update] # Rails 4 before_filter :set_product, only: [:show, :edit, :create, :update] if you're using Rails 3
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private
# Use callbacks to share common setup or constraints between actions.
def set_product
@product = Product.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def product_params
params.require(:product).permit(:name, :description) #Permit which column you want to add to database,
#value is nil when you not permit some column.
end ##strong_parameters with accept_nested_attributes
###Model
####Parent model
app/model/category.rb
class Category < ActiveRecord::Base
has_many :products, dependent: :destroy
accepts_nested_attributes_for :products
end####Children model
app/model/product.rb
class Product < ActiveRecord::Base
belongs_to :category
end ####Controller
app/controllers/categoires_controller.rb
before_action :set_category, only: [:show, :edit, :update, :destroy]
def new
@category = Category.new
3.times {@category.products.build} # For example 1 category has 3 products
end
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private
# Use callbacks to share common setup or constraints between actions.
def set_category
@category = Category.find(params[:id])
end
def category_params
params.require(:category).permit(:name, products_attributes: [:id,:name]) #Add `id` to use when edit product records
end####View
app/views/categoires/_form.html.erb
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<div class="field">
<%= f.label :name, "Category Name:" %><br>
<%= f.text_field :name %>
</div>
<%= f.fields_for :products do |pr| %>
<p>
<%= pr.label :name, "Product Name:" %>
<%= pr.text_field :name %>
<%= pr.hidden_field :id %> #Using when edit, to identify record is editing. Not create new record
</p>
<% end %>
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.###References
http://edgeapi.rubyonrails.org/classes/ActionController/StrongParameters.html
http://railscasts.com/episodes/196-nested-model-form-part-1?view=asciicast
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