Ajax response in erb from ruby method defined in controller - ruby-on-rails

Question

I have a ruby controller file with various methods defined, i want to get response of one of the method in erb i.e frontend using ajax call.
I am a beginner in ruby, so doesn't have much experience of handling requests in ruby, when i try to run the below code it gives error 404 in console stating url not found.
I have added relevant code snippets instead of entire code.
=> appcontroller.rb file
def returnimage_url
image_url = "http://dfdabfyag.jpg" //random url
{ :success => true, :img_value => image_url }.to_json
end
=> loadimage.erb file
<script>
function showImage(){
$.ajax({
url: '/returnimage_url',
method: 'GET',
dataType: "json",
success: function(response){
let image_data = JSON.parse(response);
console.log(image_data);
}
});
}
showImage();
</script>

Answer 1

You need to map the path /returnimage_url to your appcontroller.rb file and the specific method.
That should be done in your config/routes.rb file using something like this:
get 'returnimage_url', to: 'app#returnimage_url'
That will work if you rename your appcontroller.rb to app_controller.rb
See routing documentation for more info.
There are more issues in your code, but this should point you in the right direction and resolve the 404.