Only expose delete button to contacts with no contracts

else the delete fails anyway with foreign key constraint

lib/NGCP/Panel/Controller/Contact.pm

@@ -196,7 +196,16 @@ sub delete :Chained('base') :PathPart('delete') :Args(0) {
 sub ajax :Chained('list_contact') :PathPart('ajax') :Args(0) {
     my ($self, $c) = @_;
     
-    NGCP::Panel::Utils::Datatables::process($c, $c->stash->{contacts}, $c->stash->{contact_dt_columns});
+    NGCP::Panel::Utils::Datatables::process(
+        $c,
+        $c->stash->{contacts}->search_rs(undef, {prefetch=>"contracts"}),
+        $c->stash->{contact_dt_columns},
+        sub {
+            my ($result) = @_;
+            my %data = (deletable => ($result->contracts->all) ? 0 : 1);
+            return %data
+        },
+    );
     
     $c->detach( $c->view("JSON") );
 }

lib/NGCP/Panel/Utils/Datatables.pm

@@ -8,7 +8,7 @@ use Scalar::Util qw/blessed/;
 use DateTime::Format::Strptime;
 
 sub process {
-    my ($c, $rs, $cols) = @_;
+    my ($c, $rs, $cols, $row_func) = @_;
 
     my $aaData = [];
     my $totalRecords = $rs->count;
@@ -92,6 +92,9 @@ sub process {
     if(defined $topId) {
         if(defined(my $row = $rs->find($topId))) {
             push @{ $aaData }, _prune_row($cols, $row->get_inflated_columns);
+            if (defined $row_func) {
+                $aaData->[-1]->put($row_func->($row));
+            }
             $rs = $rs->search({ 'me.id' => { '!=', $topId} });
         }
     }
@@ -135,6 +138,9 @@ sub process {
 
     for my $row ($rs->all) {
         push @{ $aaData }, _prune_row($cols, $row->get_inflated_columns);
+        if (defined $row_func) {
+            $aaData->[-1]->put($row_func->($row));
+        }
     }
 
     $c->stash(

share/templates/contact/list.tt

@@ -15,7 +15,7 @@
     UNLESS c.user.read_only;
         helper.dt_buttons = [
             { name = 'Edit', uri = "/contact/'+full.id+'/edit", class = 'btn-small btn-primary', icon = 'icon-edit' },
-            { name = 'Delete', uri = "/contact/'+full.id+'/delete", class = 'btn-small btn-secondary', icon = 'icon-trash' },
+            { name = 'Delete', uri = "/contact/'+full.id+'/delete", class = 'btn-small btn-secondary', icon = 'icon-trash' condition = 'full.deletable' },
         ];
         helper.top_buttons = [
             { name = 'Create Contact', uri = c.uri_for('/contact/create'), icon = 'icon-star' },