如何使用rails中的一个表单更新多个字段

Question

I would like to update my stock check every day. So I have Ingredient table in my database also have IngredietnStockChek where every day I would like to save my stock check. My idea is to create form who will show me input field quantity for every product I've got and then on this form I'll put how much I have.

    <%= form_for(@stock_of_ingredient, :multipart => true,  html: { class: "form-horizontal", role: "form" }) do |f| %>
<% @ingredients.each do |b| %>
<%= fields_for "stock_of_ingredients" do |c| %>
 <div class="form-group">
    <%= c.label "#{b.name}", class: "col-sm-2 control-label" %>
    <div class="col-sm-10">
      <%= c.number_field :ingredient_id, class: "form-control", value: "#{b.id}" %>
    </div>
  </div>
  <div class="form-group">
    <%= c.label :quantity, class: "col-sm-2 control-label" %>
    <div class="col-sm-10">
      <%= c.text_field :quantity, class: "form-control" %>
    </div>
  </div>
  <div class="form-group">
    <%= c.label :todays_date, class: "col-sm-2 control-label" %>
    <div class="col-sm-10">
      <%= c.date_select :todays_date, class: "form-control" %>
    </div>
  </div>
<% end %>
<% end %>   

So this is my form should I use

 <%= fields_for "stock_of_ingredients" do |c| %>`

Or should I

 <%= fields_for "stock_of_ingredients[]" do |c| %>

To catch all data from all fields

And how to modify controller create action to save all, I should probably use loop but how.

 def create


    @stock_of_ingredient = StockOfIngredient.new(stock_of_ingredient_params)
    respond_to do |format|
      if @stock_of_ingredient.save

        format.html { redirect_to @stock_of_ingredient, notice: 'Stock of ingredient was successfully created.' }
        format.json { render :show, status: :created, location: @stock_of_ingredient }
      else
        format.html { render :new }
        format.json { render json: @stock_of_ingredient.errors, status: :unprocessable_entity }
      end
    end
  end

Answer 1

As far as I understand what you're doing, I think you can use fields_for:

<%= form_tag update_my_ingredients_for_a_product_path, method: :put do %>
  <% @ingredients.each do |b| %>
    <%= fields_for "ingredients[]", b do |f| %>
     <div class="form-group">
       <%= f.label "#{b.name}", class: "col-sm-2 control-label" %>
       <div class="col-sm-10">
       <%= f.number_field :ingredient_id, class: "form-control", value: "#{b.id}" %>
       </div>
     </div>
     ...
  <% end %>
  <%= submit_tag "Save", class: "btn btn-default" %>
<% end %>

Documentation for fields_for

Railscast close to your question