application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  before_action :configure_permitted_parameters, if: :devise_controller?
  before_action :authenticate_user!

  def configure_permitted_parameters
    devise_parameter_sanitizer.permit(:sign_up, keys: [:name, :username, :bio, :location, :email, :password, :password_confirmation])

    devise_parameter_sanitizer.permit(:account_update, keys: [:name, :username, :bio, :location, :email, :password, :password_confirmation])
  end
end

new.html.erb

<h1>New Tweet</h1>

<%= form_for(@tweet) do |f| %>
<% if @tweet.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@tweet.errors.count, "error") %> prohibited this tweet from being saved:</h2>

      <ul>
        <% @tweet.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :message %><br>
    <%= f.text_field :message %>
  </div>
  <div class="field">
    <%= f.label :user_id %><br>
    <%= f.text_field :user_id, value: current_user.id %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

<%= link_to 'Back', tweets_path %>

routes.rb

Rails.application.routes.draw do

  resources :tweets

  root 'tweets#index'
  devise_for :users
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

tweets_controller.rb

class TweetsController < ApplicationController
  def index
  end

  def new
    @tweet = Tweet.new
  end

  def create
    @tweet = Tweet.new(tweet_params)

    respond_to do |format|
      if @tweet.save
        format.html { redirect_to tweet_path(@tweet.id), notice: 'success!'}
      else
        format.html { render :new, error: 'there was a problem' }
      end
    end
  end

  def edit
  end

  def show
  end

 private

 def tweet_params
    params.require(:tweet).permit(:message, :user_id)
  end
end