X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2Fstemmaweb%2FController%2FRelation.pm;h=0a0579ca5977e0d1ff97644d51aff0e81b57d9f9;hb=89aae3eec7a0e23f314597cd09bd3ffc696c7412;hp=536269ac5bb2aaf406babb595a0ae4b0f08877a5;hpb=b28e606ed92c3cb17501c55987af65b154090f5b;p=scpubgit%2Fstemmaweb.git

diff --git a/lib/stemmaweb/Controller/Relation.pm b/lib/stemmaweb/Controller/Relation.pm
index 536269a..0a0579c 100644
--- a/lib/stemmaweb/Controller/Relation.pm
+++ b/lib/stemmaweb/Controller/Relation.pm
@@ -1,6 +1,10 @@
 package stemmaweb::Controller::Relation;
+use JSON qw/ to_json from_json /;
 use Moose;
+use Moose::Util::TypeConstraints qw/ find_type_constraint /;
+use Module::Load;
 use namespace::autoclean;
+use Text::Tradition::Datatypes;
 use TryCatch;
 
 BEGIN { extends 'Catalyst::Controller' }
@@ -24,100 +28,622 @@ Renders the application for the text identified by $textid.
 
 =cut
 
-sub index :Path :Args(1) {
+sub index :Path :Args(0) {
+	my( $self, $c ) = @_;
+	$c->stash->{'template'} = 'relate.tt';
+}
+
+=head2 text
+
+ GET relation/$textid/
+ 
+ Runs the relationship mapper for the specified text ID.
+ 
+=cut
+
+sub text :Chained('/') :PathPart('relation') :CaptureArgs(1) {
 	my( $self, $c, $textid ) = @_;
-	my $m = $c->model('Directory');
-	my $tradition = $m->tradition( $textid );
+	my $tradition = $c->model('Directory')->tradition( $textid );
+	unless( $tradition ) {
+		$c->response->status('404');
+		$c->response->body("No such tradition with ID $textid");
+		$c->detach('View::Plain');
+		return;
+	}
+	
+    # Account for a bad interaction between FastCGI and KiokuDB
+    unless( $tradition->collation->tradition ) {
+        $c->log->warn( "Fixing broken tradition link" );
+        $tradition->collation->_set_tradition( $tradition );
+        $c->model('Directory')->save( $tradition );
+    }
+    # Check permissions. Will return 403 if denied, otherwise will
+    # put the appropriate value in the stash.
+    my $ok = _check_permission( $c, $tradition );
+    return unless $ok;
+
+	$c->stash->{'textid'} = $textid;
+	$c->stash->{'tradition'} = $tradition;
+}
+
+sub main :Chained('text') :PathPart('') :Args(0) {
+	my( $self, $c ) = @_;
+	my $tradition = delete $c->stash->{'tradition'};
 	my $collation = $tradition->collation;
-	my $svg_str = $collation->as_svg;
+
+	# Stash text direction to use in JS.
+	$c->stash->{'direction'} = $collation->direction;
+
+	# Stash the relationship definitions
+	$c->stash->{'relationship_scopes'} = 
+		to_json( find_type_constraint( 'RelationshipScope' )->values );
+	$c->stash->{'ternary_values'} = 
+		to_json( find_type_constraint( 'Ternary' )->values );
+	my @reltypeinfo;
+	foreach my $type ( sort { _typesort( $a, $b ) } $collation->relations->types ) {
+		next if $type->is_weak;
+		my $struct = { name => $type->name, description => $type->description };
+		push( @reltypeinfo, $struct );
+	}
+	$c->stash->{'relationship_types'} = to_json( \@reltypeinfo );
+	
+	# See how big the tradition is. Edges are more important than nodes
+	# when it comes to rendering difficulty.
+	my $numnodes = scalar $collation->readings;
+	my $numedges = scalar $collation->paths;
+	my $length = $collation->end->rank;
+	# We should display no more than roughly 500 nodes, or roughly 700
+	# edges, at a time.
+	my $segments = $numnodes / 500;
+	if( $numedges / 700 > $segments ) {
+		$segments = $numedges / 700;
+	}
+	my $segsize = sprintf( "%.0f", $length / $segments );
+	my $margin = sprintf( "%.0f", $segsize / 10 );
+	if( $segments > 1 ) {
+		# Segment the tradition in order not to overload the browser.
+		my @divs;
+		my $r = 0;
+		while( $r + $margin < $length ) {
+			push( @divs, $r );
+			$r += $segsize;
+		}
+		$c->stash->{'textsegments'} = [];
+		foreach my $i ( 0..$#divs ) {
+			my $seg = { 'start' => $divs[$i] };
+			$seg->{'display'} = "Segment " . ($i+1);
+			push( @{$c->stash->{'textsegments'}}, $seg );
+		}
+	}
+	my $startseg = $c->req->param('start');
+	my $svgopts;
+	if( $startseg ) {
+		# Only render the subgraph from startseg to endseg or to END,
+		# whichever is less.
+		my $endseg = $startseg + $segsize + $margin;
+		$svgopts = { 'from' => $startseg };
+		$svgopts->{'to'} = $endseg if $endseg < $collation->end->rank;
+	} elsif( exists $c->stash->{'textsegments'} ) {
+		# This is the unqualified load of a long tradition. We implicitly start 
+		# at zero, but go only as far as our segment size.
+		my $endseg = $segsize + $margin;
+		$startseg = 0;
+		$svgopts = { 'to' => $endseg };
+	}
+	# Spit out the SVG
+	my $svg_str = $collation->as_svg( $svgopts );
 	$svg_str =~ s/\n//gs;
+	$c->stash->{'startseg'} = $startseg if defined $startseg;
 	$c->stash->{'svg_string'} = $svg_str;
+	$c->stash->{'text_title'} = $tradition->name;
+	if( $tradition->can('language') && $tradition->language ) {
+		$c->stash->{'text_lang'} = $tradition->language;
+		$c->stash->{'can_morphologize'} = 1;
+	} else {
+		$c->stash->{'text_lang'} = 'Default';
+	}
 	$c->stash->{'template'} = 'relate.tt';
 }
 
-sub dispatcher :Path :Args(2) {
-	my( $self, $c, $textid, $forward ) = @_;
-	$c->stash->{'collation'} = $c->model('Directory')->tradition( $textid )->collation;
-	$c->forward( $forward );	
+sub _typesort {
+	my( $a, $b ) = @_;
+	my $blsort = $a->bindlevel <=> $b->bindlevel;
+	return $blsort if $blsort;
+	return $a->name cmp $b->name;
+}
+
+=head2 help
+
+ GET relation/help/$language
+
+Returns the help window HTML.
+
+=cut
+
+sub help :Local :Args(1) {
+	my( $self, $c, $lang ) = @_;
+	# Display the morphological help for the language if it is defined.
+	if( $lang && $lang ne 'Default' ) {
+		my $mod = 'Text::Tradition::Language::' . $lang;
+		try {
+			load( $mod );
+		} catch {
+			$c->log->debug("Warning: could not load $mod");
+		}
+		my $has_mod = $mod->can('morphology_tags');
+		if( $has_mod ) {
+			my $tagset = &$has_mod;
+			$c->stash->{'tagset'} = $tagset;
+		}
+	}
+	$c->stash->{'template'} = 'relatehelp.tt';
 }
 
-=head2 relationship_definition
+=head2 relationships
+
+ GET relation/$textid/relationships
+
+Returns the list of relationships defined for this text.
+
+ POST relation/$textid/relationships { request }
+ 
+Attempts to define the requested relationship within the text. Returns 200 on
+success or 403 on error.
 
- GET relation/relationship_definition
+ DELETE relation/$textid/relationships { request }
  
-Returns a data structure giving the valid types and scopes for a relationship.
 
 =cut
 
-sub relationship_definition :Local :Args(0) {
+sub relationships :Chained('text') :PathPart :Args(0) {
 	my( $self, $c ) = @_;
-	my $valid_relationships = [ qw/ spelling orthographic grammatical meaning / ];
-	my $valid_scopes = [ qw/ local global / ];
-	$c->stash->{'result'} = { 'types' => $valid_relationships, 'scopes' => $valid_scopes };
+	my $tradition = delete $c->stash->{'tradition'};
+	my $ok = _check_permission( $c, $tradition );
+	return unless $ok;
+	my $collation = $tradition->collation;
+	my $m = $c->model('Directory');
+	if( $c->request->method eq 'GET' ) {
+		my @pairs = $collation->relationships; # returns the edges
+		my @all_relations;
+		foreach my $p ( @pairs ) {
+			my $relobj = $collation->relations->get_relationship( @$p );
+			next if $relobj->type eq 'collated'; # Don't show these
+			next if $p->[0] eq $p->[1]; # HACK until bugfix
+			my $relhash = { source_id => $p->[0], target_id => $p->[1], 
+				  source_text => $collation->reading( $p->[0] )->text,
+				  target_text => $collation->reading( $p->[1] )->text,
+				  type => $relobj->type, scope => $relobj->scope,
+				  a_derivable_from_b => $relobj->a_derivable_from_b,
+				  b_derivable_from_a => $relobj->b_derivable_from_a,
+				  non_independent => $relobj->non_independent,
+				  is_significant => $relobj->is_significant
+				  };
+			$relhash->{'note'} = $relobj->annotation if $relobj->has_annotation;
+			push( @all_relations, $relhash );
+		}
+		$c->stash->{'result'} = \@all_relations;
+	} else {
+		# Check write permissions first of all
+		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' );
+		} elsif( $c->request->method eq 'POST' ) {
+			my $opts = $c->request->params; 
+			
+			# Retrieve the source / target from the options
+			my $node = delete $opts->{source_id};
+			my $target = delete $opts->{target_id};
+			
+			# Make sure we didn't send a blank or invalid relationship type
+			my $relation = $opts->{type};
+			unless( $collation->get_relationship_type( $relation ) ) {
+				my $errmsg = $relation ? "No such relationship type $relation" :
+					"You must specify a relationship type";
+				$c->stash->{'result'} = { error => $errmsg };
+				$c->response->status( '400' );
+				$c->detach( 'View::JSON' );
+			}
+			
+			# Keep the data clean
+			my @booleans = qw/ a_derivable_from_b b_derivable_from_a non_independent /;
+			foreach my $k ( keys %$opts ) {
+				if( $opts->{$k} && grep { $_ eq $k } @booleans ) {
+					$opts->{$k} = 1;
+				}
+			}
+		
+			delete $opts->{scope} unless $opts->{scope};
+			delete $opts->{annotation} unless $opts->{annotation};
+			delete $opts->{is_significant} unless $opts->{is_significant};
+			$opts->{propagate} = 1;
+			
+			try {
+				my @vectors = $collation->add_relationship( $node, $target, $opts );
+				$c->stash->{'result'} = \@vectors;
+				$m->save( $tradition );
+			} catch( Text::Tradition::Error $e ) {
+				$c->response->status( '403' );
+				$c->stash->{'result'} = { error => $e->message };
+			} catch {
+				$c->response->status( '500' );
+				$c->stash->{'result'} = { error => "Something went wrong with the request" };
+			}
+		} elsif( $c->request->method eq 'DELETE' ) {
+			my $node = $c->request->param('source_id');
+			my $target = $c->request->param('target_id');
+			my $scopewide = $c->request->param('scopewide') 
+				&& $c->request->param('scopewide') eq 'true';
+			try {
+				my @vectors = $collation->del_relationship( $node, $target, $scopewide );
+				$m->save( $tradition );
+				$c->stash->{'result'} = \@vectors;
+			} catch( Text::Tradition::Error $e ) {
+				$c->response->status( '403' );
+				$c->stash->{'result'} = { 'error' => $e->message };
+			} catch {
+				$c->response->status( '500' );
+				$c->stash->{'result'} = { error => "Something went wrong with the request" };
+			}
+		}
+	}
 	$c->forward('View::JSON');
 }
 
-=head2 set_relationship
+=head2 readings
 
- POST relation/$textid/relationship
-   source_id: $source, target_id: $target, rel_type: $type, scope: $scope
-   
-Sets the specified relationship between the readings in $source and $target.
-Returns 200 and a list of node pairs where the relationship was added on success;
-returns 403 and an { error: message } struct on failure.
+ GET relation/$textid/readings
+
+Returns the list of readings defined for this text along with their metadata.
 
 =cut
 
-sub relationship :Private {
+my %read_write_keys = (
+	'id' => 0,
+	'text' => 0,
+	'is_meta' => 0,
+	'grammar_invalid' => 1,
+	'is_nonsense' => 1,
+	'normal_form' => 1,
+);
+
+sub _reading_struct {
+	my( $reading ) = @_;
+	# Return a JSONable struct of the useful keys.  Keys meant to be writable
+	# have a true value; read-only keys have a false value.
+	my $struct = {};
+	map { $struct->{$_} = $reading->$_ if $reading->can( $_ ) } keys( %read_write_keys );
+	# Special case
+	$struct->{'lexemes'} = $reading->can( 'lexemes' ) ? [ $reading->lexemes ] : [];
+	# Look up any words related via spelling or orthography
+	my $sameword = sub { 
+		my $t = $_[0]->type;
+		return $t eq 'spelling' || $t eq 'orthographic';
+	};
+	# Now add the list data
+	$struct->{'variants'} = [ map { $_->text } $reading->related_readings( $sameword ) ];
+	$struct->{'witnesses'} = [ $reading->witnesses ];
+	return $struct;
+}
+
+sub readings :Chained('text') :PathPart :Args(0) {
 	my( $self, $c ) = @_;
-	my $collation = delete $c->stash->{'collation'};
-	my $node = $c->request->param('source_id');
-	my $target = $c->request->param('target_id');
-	my $relation = $c->request->param('rel_type');
-	my $note = $c->request->param('note');
-	my $scope = $c->request->param('scope');
-
-	my $opts = { 'type' => $relation,
-				 'scope' => $scope };
-	
-	try {
-		my @vectors = $collation->add_relationship( $node, $target, $opts );
-		$c->stash->{'result'} = \@vectors;
-	} catch( Text::Tradition::Error $e ) {
-		$c->response->status( '403' );
-		$c->stash->{'result'} = { 'error' => $e->message };
+	my $tradition = delete $c->stash->{'tradition'};
+	my $ok = _check_permission( $c, $tradition );
+	return unless $ok;
+	my $collation = $tradition->collation;
+	my $m = $c->model('Directory');
+	if( $c->request->method eq 'GET' ) {
+		my $rdginfo = {};
+		foreach my $rdg ( $collation->readings ) {
+			$rdginfo->{$rdg->id} = _reading_struct( $rdg );
+		}
+		$c->stash->{'result'} = $rdginfo;
 	}
 	$c->forward('View::JSON');
 }
 
-=head2 relationships
+=head2 reading
 
- GET relation/$textid/relationships
+ GET relation/$textid/reading/$id
+
+Returns the list of readings defined for this text along with their metadata.
+
+ POST relation/$textid/reading/$id { request }
+ 
+Alters the reading according to the values in request. Returns 403 Forbidden if
+the alteration isn't allowed.
+
+=cut
+
+sub reading :Chained('text') :PathPart :Args(1) {
+	my( $self, $c, $reading_id ) = @_;
+	my $tradition = delete $c->stash->{'tradition'};
+	my $collation = $tradition->collation;
+	my $rdg = $collation->reading( $reading_id );
+	my $m = $c->model('Directory');
+	if( $c->request->method eq 'GET' ) {
+		$c->stash->{'result'} = $rdg ? _reading_struct( $rdg )
+			: { 'error' => "No reading with ID $reading_id" };
+	} elsif ( $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;
+		if( $rdg && $rdg->does('Text::Tradition::Morphology') ) {
+			# Are we re-lemmatizing?
+			if( $c->request->param('relemmatize') ) {
+				my $nf = $c->request->param('normal_form');
+				# TODO throw error unless $nf
+				$rdg->normal_form( $nf );
+				# TODO throw error if lemmatization fails
+				# TODO skip this if normal form hasn't changed
+				$rdg->lemmatize();
+			} else {
+				# Set all the values that we have for the reading.
+				# TODO error handling
+				foreach my $p ( keys %{$c->request->params} ) {
+					if( $p =~ /^morphology_(\d+)$/ ) {
+						# Set the form on the correct lexeme
+						my $morphval = $c->request->param( $p );
+						next unless $morphval;
+						my $midx = $1;
+						my $lx = $rdg->lexeme( $midx );
+						my $strrep = $rdg->language . ' // ' . $morphval;
+						my $idx = $lx->has_form( $strrep );
+						unless( defined $idx ) {
+							# Make the word form and add it to the lexeme.
+							try {
+								$idx = $lx->add_matching_form( $strrep ) - 1;
+							} catch( Text::Tradition::Error $e ) {
+								$c->response->status( '403' );
+								$errmsg = $e->message;
+							} catch {
+								# Something else went wrong, probably a Moose error
+								$c->response->status( '500' );
+								$errmsg = 'Something went wrong with the request';	
+							}
+						}
+						$lx->disambiguate( $idx ) if defined $idx;
+					} elsif( $read_write_keys{$p} ) {
+						my $val = _clean_booleans( $rdg, $p, $c->request->param( $p ) );
+						$rdg->$p( $val );
+					}
+				}		
+			}
+			$m->save( $rdg );
+		} else {
+			$errmsg = "Reading does not exist or cannot be morphologized";
+		}
+		$c->stash->{'result'} = $errmsg ? { 'error' => $errmsg }
+			: _reading_struct( $rdg );
+
+	}
+	$c->forward('View::JSON');
+
+}
+
+=head2 merge
 
-Returns a list of relationships that exist in the specified text. Each
-relationship is returned in a struct that looks like:
+ 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' };
+			unless( $c->request->param('single') ) {
+				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
 
-{ source: $sid, target: $tid, type: $rel_type, scope: $rel_scope }
+ POST relation/$textid/duplicate { data }
+ 
+Duplicates the requested readings, detaching the witnesses specified in
+the list to use the new reading(s) instead of the old. The data to be
+passed should be a JSON structure:
+
+ { readings: rid1,rid2,rid3,...
+   witnesses: [ wit1, ... ] }
 
 =cut
 
-sub get_relationships :Private {
+sub duplicate :Chained('text') :PathPart :Args(0) {
 	my( $self, $c ) = @_;
-	my $collation = delete $c->stash->{'collation'};
-	# TODO make this API
-	my @pairs = $collation->relationships; # returns the edges
-	my @all_relations;
-	foreach my $p ( @pairs ) {
-		my $relobj = $collation->relations->get_relationship( @$p );
-		push( @all_relations, 
-			{ source => $p->[0], target => $p->[1], 
-			  type => $relobj->type, scope => $relobj->scope } );
+	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 = {};
+		# Sort out which readings need to be duplicated from the set given, and
+		# ensure that all the given wits bear each relevant reading.
+		
+		my %wits = ();
+		map { $wits{$_} = 1 } $c->request->param('witnesses[]');
+		my %rdgranks = ();
+		foreach my $rid ( $c->request->param('readings[]') ) {
+			my $numwits = 0;
+			my $rdg = $collation->reading( $rid );
+			foreach my $rwit ( $rdg->witnesses( $rid ) ) {
+				$numwits++ if exists $wits{$rwit};
+			}
+			next unless $numwits; # Disregard readings with none of our witnesses
+			if( $numwits < keys( %wits ) ) {
+				$errmsg = "Reading $rid contains some but not all of the specified witnesses.";
+				last;
+			} elsif( exists $rdgranks{ $rdg->rank } ) {
+				$errmsg = "More than one reading would be detached along with $rid at rank " . $rdg->rank;
+				last;
+			} else {
+				$rdgranks{ $rdg->rank } = $rid;
+			}
+		}
+		
+		# Now check that the readings make a single sequence.
+		unless( $errmsg ) {
+			my $prior;
+			foreach my $rank ( sort { $a <=> $b } keys %rdgranks ) {
+				my $rid = $rdgranks{$rank};
+				if( $prior ) {
+					# Check that there is only one path between $prior and $rdg.
+					foreach my $wit ( keys %wits ) {
+						unless( $collation->prior_reading( $rid, $wit ) eq $prior ) {
+							$errmsg = "Diverging witness paths from $prior to $rid at $wit";
+							last;
+						}
+					}
+				}
+				$prior = $rid;
+			}
+		}
+		
+		# Abort if we've run into a problem.
+		if( $errmsg ) {
+			$c->stash->{'result'} = { 'error' => $errmsg };
+			$c->response->status( '403' );
+			$c->forward('View::JSON');
+			return;
+		}
+		
+		# Otherwise, do the dirty work.
+		my @witlist = keys %wits;
+		my @deleted_relations;
+		foreach my $rank ( sort { $a <=> $b } keys %rdgranks ) {
+			my $newrdg;
+			my $reading_id = $rdgranks{$rank};
+			my @delrels;
+			try {
+				( $newrdg, @delrels ) = 
+					$collation->duplicate_reading( $reading_id, @witlist );
+			} catch( Text::Tradition::Error $e ) {
+				$c->response->status( '403' );
+				$errmsg = $e->message;
+			} catch {
+				# Something else went wrong, probably a Moose error
+				$c->response->status( '500' );
+				$errmsg = 'Something went wrong with the request';	
+			}
+			if( $newrdg ) {
+				my $data = _reading_struct( $newrdg );
+				$data->{'orig_rdg'} = $reading_id;
+				$response->{"$newrdg"} = $data;
+				push( @deleted_relations, @delrels );
+			}
+		} 
+		if( $errmsg ) {
+			$c->stash->{'result'} = { 'error' => $errmsg };
+		} else {
+			$m->save( $collation );
+			$response->{'DELETED'} = \@deleted_relations;
+			$c->stash->{'result'} = $response;
+		}
 	}
-	$c->stash->{'result'} = \@all_relations;
 	$c->forward('View::JSON');
-}		
+}
 
 
+
+sub _check_permission {
+	my( $c, $tradition ) = @_;
+    my $user = $c->user_exists ? $c->user->get_object : undef;
+    # Does this user have access?
+    if( $user ) {
+   		if( $user->is_admin || 
+    			( $tradition->has_user && $tradition->user->id eq $user->id ) ) {
+			$c->stash->{'permission'} = 'full';
+			return 1;
+		}
+    } 
+    # Is it public?
+    if( $tradition->public ) {
+    	$c->stash->{'permission'} = 'readonly';
+    	return 1;
+    } 
+	# Forbidden!
+	$c->response->status( 403 );
+	$c->response->body( 'You do not have permission to view this tradition.' );
+	$c->detach( 'View::Plain' );
+	return 0;
+}
+
+sub _clean_booleans {
+	my( $obj, $param, $val ) = @_;
+	if( $obj->meta->get_attribute( $param )->type_constraint->name eq 'Bool' ) {
+		$val = 1 if $val eq 'true';
+		$val = undef if $val eq 'false';
+	} 
+	return $val;
+}
+
 =head2 end
 
 Attempt to render a view, if needed.