_notes.html.erb

<% if current_doctor %>
    <!--Ficha va aqui-->
    <%conversation = current_member.mailbox.conversations.find(params[:id])%>

        <div class="jumbotron">
            <h1>Informacion de Paciente</h1>
            <p>Edad: <%=@user.age%></p>
            <p>Resumen del paciente: </p>
            <p><%=@user.username%></p>
            <p> Ingresar notas: </p>
            <%=conversation.id%>
        </div>

        <div class="container">
            <%= form_with model: @note, url: notes_path,:method => :POST,  local: true do |f| %>
            <%= f.hidden_field(:doctor_id, :value =>  current_doctor.id)%>
            <%= f.hidden_field(:user_id,  :value => @user.id)%>
            <%= f.rich_text_area :body %>
            <%= f.submit%>
           
        <% end %>
        </div>

    <!--Ficha termina aqui-->
<%end%>

conversations-show.html.erb

<div class="container">
        <div class="row">
            <div class="col-md-12">
                <div class="row">
                    <div class="col-md-1">
                    </div>
                    <div class="col-md-10">
                        <div class="jumbotron">
                            <h1 class="display-4">Consulta en linea</h1>
                            <% recipient = @conversation.participants.find { |p| p != current_member } %>
                            <p class="lead"><span class="text-dark"><%=recipient.name%></span> y <span class="text-primary"><%=current_member.name%> (yo)</span></p>
                            <hr class="my-4">
                            <p><%=@conversation.subject %></p>
                        </div>
                    </div>
                    <div class="col-md-1">
                    </div>
                </div>
                <div class="row">
                    <div class="col-md-1" style="background-color:blue;">
                    </div>
                    <div class="col-md-5" style="background-color:red;">
                        <!--Chat va aqui-->
                        <div class="form-group">
                                
                                <div class="scrolleame bg-light">
                                    <section>
                                     <% @conversation.receipts_for(current_member).each do |receipt|%>
                                        
                                            <p><%= receipt.message.sender.name%> dijo: &nbsp; <%= receipt.message.body%></p>
                                    <%end%>
                                    <div id="msg">
                                
                                    </div>
                                </section>
                             </div>
                             <hr>
                             <%= form_tag conversation_messages_path(@conversation), method: :post do%>
                                        <div class="container-fluid ">
                                                <%= text_area_tag :body,nil, class: "form-control-lg", id:"sample5", placeholder: "Introduce un mensaje...", :rows => 10, style: 'width:100%;' %>
                                        </div >
                                        <button class="btn btn-outline-success bg-dark" id="tte">
                                                <i class="fa fa-paper-plane" aria-hidden="true"></i>
                                          &nbsp; Enviar
                                              </button>
                            <%end%>


                        <!--Chat termina aqui-->
                    </div>
                    </div>
                        <div class="col col-md-4" style="background-color:blueviolet;">
                                <%= render "walls/notes.html.erb"%>
                        </div>

                    <div class="col col-md-1" style="background-color:yellow;">
                    </div>
                </div>
            </div>
        </div>
    </div>

conversations_controller.rb

class ConversationsController < ApplicationController
before_action :authenticate_member!
   def index

     @conversations = current_member.mailbox.conversations
     

   end

   def show


    @conversation = current_member.mailbox.conversations.find(params[:id])
    @user = User.find_by_id(@conversation.participants.find { |p| p != current_doctor })

    if(Note.find_by user_id: @user.id)
      @note=Note.find_by user_id: @user.id
    else
      @note=Note.new
    end

      
  
   end

   def new
      @recipients = Doctor.find_by_id(params[:doctor_id])
      recipient = Doctor.find(params[:doctor_id])
      

    
   end

   def create

      recipient = Doctor.find(params[:user_id])
      receipt = current_member.send_message(recipient, params[:body],params[:subject])
      redirect_to conversation_path(receipt.conversation)


   end


end

notes_controller.rb

class NotesController < ApplicationController
  before_action :set_note, only: [:show, :edit, :update, :destroy]

  # GET /notes
  # GET /notes.json
  def index
    @notes = Note.all
  end

  # GET /notes/1
  # GET /notes/1.json
  def show
  end

  # GET /notes/new
  def new
    @note = Note.new
  end

  # GET /notes/1/edit
  def edit
  end

  # POST /notes
  # POST /notes.json
  def create
    @note = Note.new(note_params)

    respond_to do |format|
      if @note.save
        format.html { redirect_to @note, notice: 'Note was successfully created.' }
        format.json { render :show, status: :created, location: @note }
      else
        format.html { render :new }
        format.json { render json: @note.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /notes/1
  # PATCH/PUT /notes/1.json
  def update
    respond_to do |format|
      if @note.update(note_params)
        format.html { redirect_to @note, notice: 'Note was successfully updated.' }
        format.json { render :show, status: :ok, location: @note }
      else
        format.html { render :edit }
        format.json { render json: @note.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /notes/1
  # DELETE /notes/1.json
  def destroy
    @note.destroy
    respond_to do |format|
      format.html { redirect_to notes_url, notice: 'Note was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def note_params
      params.require(:note).permit(:title, :user_id, :doctor_id)
    end
end