Rails capybaraAmbiguous match, found 50 elements matching css - ruby-on-rails

Question

I get this error:
Ambiguous match, found 50 elements matching css "input[value=\"delete\"]"
When I put the following code:
find('input[value="delete"]').first.click
On html file:
<div id="deletediv-38">
<form class="button_to" onsubmit="return confirm('Are you sure you want to delete?')" method="post" action="/del/38">
<input type="hidden" name="_method" value="delete" />
<input type="submit" name="delete-38" value="delete" />
</form>
</div>
<div id="deletediv-39">
<form class="button_to" onsubmit="return confirm('Are you sure you want to delete?')" method="post" action="/del/39">
<input type="hidden" name="_method" value="delete" />
<input type="submit" name="delete-39" value="delete" />
</form>
</div>
.
.
.
find('input[id="delete-38"]') doesn't work , it says element not found.
And I can't count as well.
when I do
find('input[value="delete"]').count.should_be > 0
I again get the error:
Ambiguous match, found 50 elements matching css "input[value=\"delete\"]"

Answer 1

To explain the errors you're having -
find will find one unique element, if there are none or more than one matching you will get an error. Your find('input[id="delete-38"]') fails because according to the html the only elements with ids are divs and have divs of the format deletediv-xx. If you were trying to find the inputs with the name of delete-38 you would do
find('input[name="delete-38"]')
As #dimakura stated to get the first element you use #first. If you want a count of the elements you need to use #all - like so
all('input[value="delete"]').count
If the page is dynamically changing and you want to know the count on the page once at least one has appeared then you could do
all('input[value=delete]', minimum: 1).count
which would use Capybaras waiting behavior for at least one to appear before returning (or it times out while waiting)

Answer 2

Try using this instead:
first('input[value="delete"]').click