add server-side reading merge logic for issue #9; uniform handling of buttons in...

[scpubgit/stemmaweb.git] / lib / stemmaweb / Controller / Relation.pm

diff --git a/lib/stemmaweb/Controller/Relation.pm b/lib/stemmaweb/Controller/Relation.pm
index 46fb11f..bfe9d87 100644 (file)
--- a/lib/stemmaweb/Controller/Relation.pm
+++ b/lib/stemmaweb/Controller/Relation.pm
@@ -388,6 +388,72 @@ sub reading :Chained('text') :PathPart :Args(1) {
 
 }
 
+=head2 merge
+
+ POST relation/$textid/merge { data }
+ 
+Merges the requested readings, combining the witnesses of both readings into
+the target reading. All non-conflicting source relationships are inherited by
+the target relationship.
+
+=cut
+
+sub merge :Chained('text') :PathPart :Args(0) {
+       my( $self, $c ) = @_;
+       my $tradition = delete $c->stash->{'tradition'};
+       my $collation = $tradition->collation;
+       my $m = $c->model('Directory');
+       if( $c->request->method eq 'POST' ) {
+               if( $c->stash->{'permission'} ne 'full' ) {
+                       $c->response->status( '403' );
+                       $c->stash->{'result'} = { 
+                               'error' => 'You do not have permission to modify this tradition.' };
+                       $c->detach('View::JSON');
+                       return;
+               }
+               my $errmsg;
+               my $response;
+               
+               my $main = $c->request->param('target_id');
+               my $second = $c->request->param('source_id');
+               # Find the common successor of these, so that we can detect other
+               # potentially identical readings.
+               my $csucc = $collation->common_successor( $main, $second );
+
+               # Try the merge if these are parallel readings.
+               if( $csucc->id eq $main || $csucc->id eq $second ) {
+                       $errmsg = "Cannot merge readings in the same path";
+               } else {
+                       try {
+                               $collation->merge_readings( $main, $second );
+                       } catch( Text::Tradition::Error $e ) {
+                               $c->response->status( '403' );
+                               $errmsg = $e->message;
+                       } catch {
+                               # Something else went wrong, probably a Moose error
+                               $c->response->status( '403' );
+                               $errmsg = 'Something went wrong with the request';      
+                       }
+               }
+               
+               # Look for readings that are now identical.
+               if( $errmsg ) {
+                       $response = { status => 'error', error => $errmsg };
+               } else {
+                       $response = { status => 'ok' };
+                       my @identical = $collation->identical_readings(
+                               start => $main, end => $csucc->id );
+                       if( @identical ) {
+                               $response->{'checkalign'} = [ 
+                                       map { [ $_->[0]->id, $_->[1]->id ] } @identical ];
+                       }
+                       $m->save( $collation );
+               }
+               $c->stash->{'result'} = $response;
+               $c->forward('View::JSON');                      
+       }
+}
+
 =head2 duplicate
 
  POST relation/$textid/duplicate { data }
@@ -425,7 +491,6 @@ sub duplicate :Chained('text') :PathPart :Args(0) {
                foreach my $rid ( $c->request->param('readings[]') ) {
                        my $numwits = 0;
                        my $rdg = $collation->reading( $rid );
-                       $DB::single = 1;
                        foreach my $rwit ( $rdg->witnesses( $rid ) ) {
                                $numwits++ if exists $wits{$rwit};
                        }