javascript - Rails 'nil' is not an ActiveModel-compatible object. It must implement :to_partial_path. ajax - Sta

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I am following section 4 (Server Side Concerns) to set up ajax on a page. I've copied the tutorial text pletely (replacing the model names with my own) and it creates and saves my "Participants" record, but does not automatically refresh the ajax partial.

This is the error I get...which looks like it's referrring to my create.js.erb

ActionView::Template::Error ('nil' is not an ActiveModel-patible object. It must implement :to_partial_path.):
    1: $("<%= escape_javascript(render @participant) %>").appendTo("#participants");
    2: // $('#participants').html("<%= j (render @participants) %>");
  app/views/participants/create.js.erb:2:in `_app_views_participants_create_js_erb___1675277149181037111_70181034249880'

Here's my code

class ParticipantsController < ApplicationController
def new
  @participant = Participant.new
  @participants = @participants.recently_updated
end

def create
  @participant = Participant.new(participant_params)

  respond_to do |format|
    if @participant.save
      format.html { redirect_to @participant, notice: 'Helper Invited!' }
      format.js   {}
      format.json { render json: @participant, status: :created, location: @participant }
    else
      format.html { render action: "new" }
      format.json { render json: @participant.errors, status: :unprocessable_entity }
    end
  end
end

_form.html.erb

<ul id="participants">
  <%= render @participants %>
 </ul>

<%= form_for(@participant, remote: true) do |f| %>
  <%= f.label :email %><br>
  <%= f.email_field :email %>
<%= f.submit 'SUBMIT' %> 
 <script>
  $(document).ready(function() {
  return $("#new_participant").on("ajax:success", function(e, data, status, xhr) {
    return $("#new_participant").append(xhr.responseText);
  }).on("ajax:error", function(e, xhr, status, error) {
    return $("#new_participant").append("<p>Oops.  Please Try again.</p>");
  });
});
 </script>
 <script>
$(function() {
  return $("a[data-remote]").on("ajax:success", function(e, data, status, xhr) {
    return alert("The helper has been removed and notified.");
  });
});
</script>

_participant.html.erb

<li >
<%= participant.email %> <%= link_to participant, remote: true, method: :delete,  data: { confirm: 'Are you sure?' } do %>REMOVE<% end %>
</li>

create.js.erb

$("<%= escape_javascript(render @participant) %>").appendTo("#participants");

destroy.js.erb

$('#participants').html("<%= j (render @participants) %>");

I am following section 4 (Server Side Concerns) to set up ajax on a page. I've copied the tutorial text pletely (replacing the model names with my own) and it creates and saves my "Participants" record, but does not automatically refresh the ajax partial.

This is the error I get...which looks like it's referrring to my create.js.erb

ActionView::Template::Error ('nil' is not an ActiveModel-patible object. It must implement :to_partial_path.):
    1: $("<%= escape_javascript(render @participant) %>").appendTo("#participants");
    2: // $('#participants').html("<%= j (render @participants) %>");
  app/views/participants/create.js.erb:2:in `_app_views_participants_create_js_erb___1675277149181037111_70181034249880'

Here's my code

class ParticipantsController < ApplicationController
def new
  @participant = Participant.new
  @participants = @participants.recently_updated
end

def create
  @participant = Participant.new(participant_params)

  respond_to do |format|
    if @participant.save
      format.html { redirect_to @participant, notice: 'Helper Invited!' }
      format.js   {}
      format.json { render json: @participant, status: :created, location: @participant }
    else
      format.html { render action: "new" }
      format.json { render json: @participant.errors, status: :unprocessable_entity }
    end
  end
end

_form.html.erb

<ul id="participants">
  <%= render @participants %>
 </ul>

<%= form_for(@participant, remote: true) do |f| %>
  <%= f.label :email %><br>
  <%= f.email_field :email %>
<%= f.submit 'SUBMIT' %> 
 <script>
  $(document).ready(function() {
  return $("#new_participant").on("ajax:success", function(e, data, status, xhr) {
    return $("#new_participant").append(xhr.responseText);
  }).on("ajax:error", function(e, xhr, status, error) {
    return $("#new_participant").append("<p>Oops.  Please Try again.</p>");
  });
});
 </script>
 <script>
$(function() {
  return $("a[data-remote]").on("ajax:success", function(e, data, status, xhr) {
    return alert("The helper has been removed and notified.");
  });
});
</script>

_participant.html.erb

<li >
<%= participant.email %> <%= link_to participant, remote: true, method: :delete,  data: { confirm: 'Are you sure?' } do %>REMOVE<% end %>
</li>

create.js.erb

$("<%= escape_javascript(render @participant) %>").appendTo("#participants");

destroy.js.erb

$('#participants').html("<%= j (render @participants) %>");

• javascript
• ruby-on-rails
• ajax
• forms
• ruby-on-rails-4

Share Improve this question Follow asked Mar 12, 2015 at 14:58 NothingToSeeHereNothingToSeeHere 2,37355 gold badges3030 silver badges6161 bronze badges 1

• CHeck if you are getting @participant in create.js.erb file – Sonalkumar sute Commented Mar 12, 2015 at 15:04

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 5

It's on line 2 of your create.js.erb file, it's the missing @participants not the @participant.

You've mented the line out in JS, but the ERB is still going to be processed by Rails, so it's still trying to do the render @participants

Update

For future... it's the last line of that error that's the key:

app/views/participants/create.js.erb:2

See the 2 at the end, that's telling you which line the error happened on, and so that's where you need to focus when looking for the problem.

I was able to fix this error on my end. I had missed creating the action in the controller.

So in your example, I would have missed the create action in the controller. Thus, when testing anything using that action, it would fail.

Any future users experiencing this issue, make sure the action is defined and no errors/typos in the controller level.

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