RoR - UrlGenerationError, no routes matches, missing required key [:id] - ruby-on-rails

Question

I am trying to create a posts pages. Where users can see all the public posts. I can successfully create posts but I can't see them.
ActionController::UrlGenerationError in Ribbits#index Showing
C:/Sites/myBlog/app/views/ribbits/index.html.erb where line #8
raised:
No route matches {:action=>"show", :controller=>"users", :id=>nil}
missing required keys: [:id]
The index.html.erb
<% #ribbits.each do |ribbit| %>
<div class="ribbitWrapper">
<a href="<%= user_path ribbit.user %>">
<img class="avatar" src="<% ribbit.user.avatar_url %>" />
<span class="name"> <%= ribbit.user.name %> </span>
</a>
#<%= ribbit.user.username %>
<span class="time"><%= time_ago_in_words(ribbit.created_at) %></span>
<p> <%= ribbit.content %></p>
</div>
<% end %>
The users controller:
def new
#user = User.new
end
def create
#user = User.create(user_params)
if #user.save
session[:user_id] = #user.id
redirect_to #user, notice: "Thank you for signing up!"
else
render 'new'
end
end
def show
#user = User.find(params[:id])
#ribbit = Ribbit.new
end
The ribbits controller
def index
#ribbits = Ribbit.all
#ribbit = Ribbit.new
end
def create
#ribbit = Ribbit.create(user_ribbits)
#ribbit.user_id = current_user.id
if #ribbit.save
redirect_to current_user
else
flash[:error] = "Problem!"
redirect_to current_user
end
end
private
def user_ribbits
params.require(:ribbit).permit(:content, :userid)
end
def current_user
#current_user ||= User.find(session[:user_id]) if session[:user_id]
end
helper_method :current_user
And also, the routes file
resources :sessions
resources :users
resources :ribbits
get 'logout', to: 'sessions#destroy', as: 'logout'
root to: 'users#new'
Would really appreciate the help!

Answer 1

As we discovered in the comments to the question, some of the #ribbits do not have user_id set.
To address your further question of "How do I connect user_id with my ribbits, my guess is that you have ribbits with user_id null because your user_ribbits method permits :userid rather than :user_id. This is assuming of course that you're properly passing user_id from your view to your controller on the creation of a ribbit.
In order to ensure that ribbits contain a user_id, you can add the following to your Ribbit model (ribbit.rb):
validates :user_id, presence: true
If there are other issues, this should at the very least prevent you from creating a ribbit without a user_id.
I hope this helps!