ruby on rails - Why i'm getting ActiveRecord::UnknownAttributeError -

i have array of objects i'm sending controller through ajax.

my ajax request this:

$.ajax({   data: {     product: [{'name': 'ahmad', 'price': 'tench', 'quantity': '12'}, {'name': 'gulshan', 'price': 'tench', 'quantity': '12'}]   },   url: '',   type: "post",   datatype: "json",   success: function ( data ) {     console.log(data);     // this.setstate({ comments: data });   }.bind(this) }); 

controller:

def create   @product = product.new(product_params)   if @product.save     render json: @product   else     render json: @product.errors, status: :unprocessable_entity   end end  private  def product_params   params.fetch(:product).permit! end 

but if use create method i'm getting same error.

i'm attaching screenshot of parameters in rails log.

i dont understand why i'm getting error?

please help.

the issue have since you're passing array of products, rails' strong params unable determine attributes pass.

strong params expects:

params: {    product: {      "name" => "test"    } } 

this way, when require(:product).permit(:name), strong params module slice hash required. because hash looks following, hitting problem:

params: {    product: [      {"name" => "test"},      {"name" => "test2"}    ] } 

--

might worth looking @ nested values:

params.permit(:product => [{:name, :price, :quantity}])