How to alert the response of controller to ajax using ruby on rails?

[Exequiel]

I can't output the response message of my controller into my ajax, the data is successfully save but it doesn't go to the success function in ajax.

heres the _form.html.erb

<%= form_for(@personnel, remote: true) do |e| -%>
	<% if @personnel.errors.any? %>
		<div class="alert alert-error">
		<button type="button" class="close" data-dismiss="alert">&times;</button>
			<h2>Errors</h2>
			<ul>
				<% @personnel.errors.full_messages.each do |message| %>
					<li><%= message %></li>
				<% end %>
			</ul>
		</div>
	<% end %>
	<fieldset>
		<div class="form-group">
				<label for="lastname">Last Name:</label><%= e.text_field :lastname -%>
		</div>
		<div class="form-group">
			<label for="firstname">First Name:</label><%= e.text_field :firstname -%>
		</div>
		<div class="form-group">
			<label for="middlename">Middle Name:</label> <%= e.text_field :middlename -%>
		</div>
		<div class="form-group">
			<label for="extensionname">Extension Name:</label> <%= e.text_field :extensionname -%>
			</div>
		<%= e.submit 'Save', :class => 'btn btn-default', :id => 'save' -%>
	</fieldset>
<% end -%>

heres my jquery ajax application.js

$(document).ready(function(){
	
	$('#save').click(function(event){
		event.preventDefault();
		
		$.ajax({
			url: '/personnels.json',
			type: 'POST',
			success: function(a){
				alert(a.message);
				console.log(a.message);
			}
		});
		
	});
	

});

and here is my defined function create in controller personnels_cont roller.erb

def create
		@personnel = Personnel.new(personnel_params)
		
		respond_to do |format|
			if @personnel.save
				format.html { redirect_to @personnel }
				format.json { render json: { :status => 'Ok', :message => 'Personnel Successfully Added'}, status: :created }
			else
				format.html { render action: 'new' }
				format.json { render json: @personnel.errors, status: :unprocessable_entity }
			end
		end
	end

I did not show the entire controller only in my function create is the problem, , can anyone help me please? :) any comments are so appreciated, thank you very much. . :)

[Exequiel]

I made the solution already. . . .

[Rabbit]

Can you post your solution in case someone else runs into the same problem?

[Exequiel]

here are my changes in ajax.

$('#save').click(function(event){
		event.preventDefault();
		var data = $("form#new_personnel").serialize();

			$.ajax({
				url: '/personnels.json',
				type: 'POST',
				data: data,
				success: function(a){
					alert(a.message);
					console.log(a.message);
					checkform("form#new_personnel");

					//window.location = '/personnels/' + a.id
				},
				 error: function(request, status, error) {
	          //$(".error_output").html(request.responseText);
	        	errors = request.responseJSON;
	        	console.log(errors.lastname);

	        	if(typeof errors.lastname !== 'undefined') {
	        		for(var error_message in errors.lastname) {
	        			$('#personnel_lastname_errors').append(error_message);	
	        		}	
	        	}
	        }
			});

	});

and here is my controller function create.

def create
		@personnel = Personnel.new(personnel_params)

		respond_to do |format|
			if @personnel.save
				format.html { render action: 'new' }
				format.json { render :json => { :status => 'Ok', :message => 'Personnel Successfully Added'}, :status => :created }
			else
				format.html { render action: 'new' }
				format.json { render json: @personnel.errors, status: :unprocessable_entity }
			end
		end
	end

I forgot to serialize the form and put data on my ajax sorry for the very simple error, , before without serializing the the form my inputs are being save on my database so i thought there is no problem if i did not serialize the form or put data on my ajax code, , so finally i made this code. . . :) thank you for your response @RABBIT :)