Incorrect behaviour

gistfile1.txt

The diff below allows you to submit two titles to the blog application.
Had the validation not been there and had the developer just used $self->param('title'), I get the last supplied value.
However, using validation, this is not the case.
It looks like the behaviour of a 500 database type constraint failure is not necessarily so as DBD tries to stringify
this example.

Expected behaviour:
  Title to be the last one supplied
  
Actual behaviour:
  A stringification (if DBD can do it) of the two values '{"Title 1","Title 2"}'
  
There currently is no way to specify you want to use the last used value, or the inverse of extracting an arrayref of values if
just one is supplied. The patch at https://gist.github.com/chy-causer/21a6d749afe7e74a3436082df15e5aad is meant to allow for

# Only gives one title
$validation->required('title' => 'once');

# Returns an array ref of foreign_key_ids => $FOO, even when only one value has been supplied
$validation->optional('foreign_key_ids' => 'as_array')

__DIFF__

diff --git a/examples/blog/templates/posts/_form.html.ep b/examples/blog/templates/posts/_form.html.ep
index cb18a77..b3642cd 100644
--- a/examples/blog/templates/posts/_form.html.ep
+++ b/examples/blog/templates/posts/_form.html.ep
@@ -2,6 +2,7 @@
   %= label_for title => 'Title'
   <br>
   %= text_field title => $post->{title}
+  %= text_field title => $post->{title}
   <br>
   %= label_for body => 'Body'
   <br>