I'm working on a "fitness" tracker for users to enter things like "weight, Mile Time". I'm very novice with RoR and I'm trying to write my form so that if a user makes a "New" stats post, it will default the last data from the database rather than just empty values if they don't include all new values. let me elaborate: If a user clicks "New" they can enter their weight and mile time. If they don't include both, I get an empty value in my table. I believe this can be accomplished though hidden_fields but I'm unsure how to use them - even after reading documentation.

    <% @stats.each do |stat| %>
            <table class="table table-sm">
              <thead>
                <th scope="col">Time</th>
                <th scope="col">Date</th>
                <th scope="col"></th>
    
              </thead>
              <tbody>
                <tr>
                  <td><%= stat.mile %></td>
                  <td><%= stat.created_at.strftime("#{stat.created_at.day.ordinalize} %B %Y") %></td>
                  <td><%= link_to 'Edit', edit_stat_path(stat), class: "btn btn-secondary btn-sm" %>
                   <%= link_to 'Delete', stat, method: :delete, class: "btn btn-danger btn-sm", data: { confirm: 'Are you sure?' } %></td>
                </tr>
            </table>
          <% end %>
<% @stats.each do |stat| %>
        <table class="table table-sm">
          <thead>
            <th scope="col">Weight</th>
            <th scope="col">Date</th>
            <th scope="col"></th>
          </thead>
          <tbody>
            <tr>
              <td><%= stat.weight %></td>
              <td><%= stat.created_at.strftime("#{stat.created_at.day.ordinalize} %B %Y") %></td>
              <td><%= link_to 'Edit', edit_stat_path(stat), class: "btn btn-secondary btn-sm" %>
               <%= link_to 'Delete', stat, method: :delete, class: "btn btn-danger btn-sm", data: { confirm: 'Are you sure?' } %></td>
            </tr>
        </table>
      <% end %>

Here is my very basic form for new stats:

    <%= form_with(model: stat) do |form| %>
  <% if stat.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(stat.errors.count, "error") %> prohibited this stat from being saved:</h2>

      <ul>
        <% stat.errors.each do |error| %>
          <li><%= error.full_message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= form.label :mile %>
    <%= form.text_field :mile %>
  </div>

  <div class="field">
    <%= form.label :weight %>
    <%= form.text_field :weight %>
  </div>

  <div class="actions">
    <%= form.submit %>
  </div>
<% end %>

Any advice or help would be greatly appreciated!

EDIT Added stats_controller

**stats_controller.rb**
class StatsController < ApplicationController
  before_action :authenticate_user!
  before_action :set_stat, only: [:show, :edit, :update, :destroy]

  # GET /stats
  def index
    @stats = current_user.stats.order(created_at: :desc).page(params[:page]).per_page(5)
  end

  # GET /stats/1
  def show
  end

  # GET /stats/new
  def new
    @stat = current_user.stats.new
  end

  # GET /stats/1/edit
  def edit
  end

  # POST /stats
  def create
    @stat = current_user.stats.new(stat_params)

    if @stat.save
      redirect_to @stat, notice: 'Stat was successfully created.'
    else
      render :new
    end
  end

  # PATCH/PUT /stats/1
  def update
    if @stat.update(stat_params)
      redirect_to @stat, notice: 'Stat was successfully updated.'
    else
      render :edit
    end
  end

  # DELETE /stats/1
  def destroy
    @stat.destroy
    redirect_to stats_url, notice: 'Stat was successfully destroyed.'
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_stat
      @stat = Stat.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def stat_params
      params.require(:stat).permit(:user_id, :mile, :weight, :waist, :hips, :leftleg, :rightleg, :leftarm, :rightarm, :chest,:bust,:wallsit, :plank, :pushup, :burpee, :situp, :jumpsquat)
    end
end

CodePudding user response：

you should do this in your controller code...

since you didn't include controller code, you can also do this in your view:

<% 
  last_stat = current_user.stats.where.not(weight: nil).last
  stat.weight = last_stat.weight
  stat.mile = last_stat.mile
%>

<%= form_with(model: stat) do |form| %>
# ...

Inside your form inputs, you can also add required: true so the user is required to submit them...