Bdtjtk

I use devise gem for authentication. I generated a scaffold for model M. I would like to update the created_by field with the user id from the login page. How do I achieve this?

I have 2 fields in the model F1 and F2.

The form that scaffold creates shows input for users to enter values for F1 and F2. How do I update the value for created_by field using the current_user from devise? Because the create action seems to be entering only the fields from the form.

<%= form_with(model: M, local: true) do |form| %>

  <% if M.errors.any? %>

    <div id="error_explanation">

      <h2><%= pluralize(M.errors.count, "error") %> prohibited this movie from being saved:</h2>



      <ul>

      <% M.errors.full_messages.each do |message| %>

        <li><%= message %></li>

      <% end %>

      </ul>

    </div>

  <% end %>



  <div class="field">

    <%= form.label :F1 %>

    <%= form.text_field :F1 %>

  </div>



  <div class="field">

    <%= form.label :F2 %>

    <%= form.text_field :F2 %>

  </div>



  <div class="actions">

    <%= form.submit %>

  </div>

<% end %>

How to I update the model with current_user value in the above form without exposing that field to the user?

This is my controller:

class MsController < ApplicationController

before_action :set_M, only: [:show, :edit, :update, :destroy]



# GET /Ms

# GET /Ms.json

def index

@Ms = M.all



@categories = @Ms.uniq.pluck(:category)

@Ms_by_category = Hash.new



@categories.each do |category|

  @Ms_by_category[category] = M.where(:category => category)

end     

end



# GET /Ms/1

# GET /Ms/1.json

def show

end



# GET /Ms/new

def new

@M = M.new

end



# GET /Ms/1/edit

def edit

end



# POST /Ms

# POST /Ms.json

def create

@M = M.new(M_params)



respond_to do |format|

  if @M.save

    format.html { redirect_to @M, notice: 'M was successfully created.' }

    format.json { render :show, status: :created, location: @M }

  else

    format.html { render :new }

    format.json { render json: @M.errors, status: :unprocessable_entity }

  end

end

end



# PATCH/PUT /Ms/1

# PATCH/PUT /Ms/1.json

def update

respond_to do |format|

  if @M.update(M_params)

    format.html { redirect_to @M, notice: 'M was successfully updated.' }

    format.json { render :show, status: :ok, location: @M }

  else

    format.html { render :edit }

    format.json { render json: @M.errors, status: :unprocessable_entity }

  end

end

end



# DELETE /Ms/1

# DELETE /Ms/1.json

def destroy

@M.destroy

respond_to do |format|

  format.html { redirect_to Ms_url, notice: 'M was successfully destroyed.' }

  format.json { head :no_content }

end

end



private

# Use callbacks to share common setup or constraints between actions.

def set_M

  @M = M.find(params[:id])     

end



# Never trust parameters from the scary internet, only allow the white list through.

def M_params

  params.require(:M).permit(:title, :category, :rating)

end

end

You need to add users reference to M model and add associations. created_by is not the best name for it. Let imagine that M is abbreviation for Music. In this case you need to create a migration

add_reference :musics, :user

Add to the Music model

belongs_to :user

And to the User model

has_many :musics

And change in the controller

def new

  @music = current_user.musics.new

end



def create

  @music = current_user.musics.new(M_params)



  respond_to do |format|

    if @music.save

      format.html { redirect_to @music, notice: 'Music was successfully created.' }

      format.json { render :show, status: :created, location: @music }

    else

      format.html { render :new }

      format.json { render json: @music.errors, status: :unprocessable_entity }

    end

  end

end

So simple in creating action change your method, for example, you just need to create the client

before_action :authenticate_user!



def create

  @client = Client.new(name: params[:name], address: params[:address],created_by: current_user.email  )

  if @client.save

    redirect_to @client

  else 

    render 'new'

  end

end

There should be a field like created_by exist in the table.