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source: trunk/grails-app/controllers/dbnp/studycapturing/SimpleWizardController.groovy @ 1576

Last change on this file since 1576 was 1576, checked in by robert@…, 11 years ago
Solved locking problems with module communication Fixed a null pointer bug in assayController
File size: 25.6 KB

Line
1	/**
2	* SimpleWizardController Controler
3	*
4	* Description of my controller
5	*
6	* @author your email (+name?)
7	* @since 2010mmdd
8	* @package ???
9	*
10	* Revision information:
11	* $Rev: 1430 $
12	* $Author: work@osx.eu $
13	* $Date: 2011-01-21 21:05:36 +0100 (Fri, 21 Jan 2011) $
14	*/
15	package dbnp.studycapturing
16
17	import org.dbnp.gdt.*
18	import grails.plugins.springsecurity.Secured
19	import dbnp.authentication.SecUser
20	import dbnp.importer.ImportCell
21	import dbnp.importer.ImportRecord
22	import dbnp.importer.MappingColumn
23
24	@Secured(['IS_AUTHENTICATED_REMEMBERED'])
25	class SimpleWizardController extends StudyWizardController {
26	def authenticationService
27	def fileService
28	def importerService
29	def gdtService
30
31	/**
32	* index closure
33	*/
34	def index = {
35	redirect( action: "study" );
36	}
37
38	/**
39	* Shows the study page
40	*/
41	def study = {
42	// Retrieve the correct study
43	Study study = getStudyInWizard( params );
44
45	// If no study is found in the wizard, this is the entry page of the
46	// wizard. Retrieve the study from request parameters
47	if( !study ) {
48	study = getStudyFromRequest( params );
49
50	// Some error might have occurred during the retrieval of the study
51	if( !study ) {
52	redirect( controller: 'simpleWizard', action: 'study' );
53	return;
54	}
55
56	session.simpleWizard = [ study: study ]
57	}
58
59	def event = getEvent(params);
60
61	// If any event on this page is triggered, we should save the entered data.
62	// If no event is triggered, the user gets here from another page. In that case,
63	// we don't set the values
64	if( event ) {
65	// Only continue to the next or previous page if the information entered is correct
66	if( handleStudy( study, params ) ) {
67	// Now determine what action to perform
68	// If the user clicks next, the study should be validated
69	if( event == "next" && validateObject( study ) ) {
70	toPage( "samples" );
71	return;
72	}
73	}
74	}
75
76	// Give the study to the user
77	[ study: study ]
78	}
79
80	/**
81	* Shows the samples page
82	*/
83	def samples = {
84	// Retrieve the correct study
85	study = getStudyInWizard( params );
86	if( !study ) {
87	redirect( controller: 'simpleWizard', action: 'study' );
88	return;
89	}
90
91	def event = getEvent(params);
92
93	// If any event on this page is triggered, we should save the entered data.
94	// If no event is triggered, the user gets here from another page. In that case,
95	// we don't set the values
96	if( event ) {
97	// Now determine what action to perform
98	if( event == "next" && handleSamples( study, params )) {
99	// Only continue to the next page if the information entered is correct
100	toPage( "columns" );
101	return;
102	} else if( event == "previous" ) {
103	// The user may go to the previous page, even if none of the data entered is OK.
104	toPage( "study" );
105	return;
106	} else if( event == "skip" ) {
107	// The user may skip the complete samples page
108	toPage( "assays" );
109	return;
110	}
111	}
112
113	// Give the study and other data to the user
114	[ study: study, sampleTemplates: Template.findAllByEntity( Sample.class ), encodedEntity: gdtService.encryptEntity( Sample.class.name ), sampleForm: session.simpleWizard.sampleForm ]
115	}
116
117	/**
118	* Shows the columns page
119	*/
120	def columns = {
121	// Retrieve the correct study
122	study = getStudyInWizard( params );
123	if( !study ) {
124	redirect( controller: 'simpleWizard', action: 'study' );
125	return;
126	}
127
128	def event = getEvent(params);
129
130	// If any event on this page is triggered, we should save the entered data.
131	// If no event is triggered, the user gets here from another page. In that case,
132	// we don't set the values
133	if( event ) {
134	// Now determine what action to perform
135	if( event == "next" && handleColumns( study, params ) ) {
136	// Only continue to the next page if the information entered is correct
137	if( session.simpleWizard.imported.numInvalidEntities > 0 ) {
138	toPage( "missingFields" );
139	} else {
140	// The import of the excel file has finished. Now delete the excelfile
141	if( session.simpleWizard.sampleForm.importFile )
142	fileService.delete( session.simpleWizard.sampleForm.importFile );
143
144	toPage( "assays" );
145	}
146	return;
147	} else if( event == "previous" ) {
148	// THe user may go to the previous page, even if the data is not correct
149	toPage( "samples" );
150	return;
151	}
152	}
153
154	// Give the study and other data to the user
155	[ study: study,
156	filename: session.simpleWizard.sampleForm.importFile,
157	template: Template.get( session.simpleWizard.sampleForm.templateId ),
158	excel: session.simpleWizard.excel]
159	}
160
161	/**
162	* Shows the page where missing fields can be filled in
163	*/
164	def missingFields = {
165	// Retrieve the correct study
166	study = getStudyInWizard( params );
167	if( !study ) {
168	redirect( controller: 'simpleWizard', action: 'study' );
169	return;
170	}
171
172	def event = getEvent(params);
173
174	// If any event on this page is triggered, we should save the entered data.
175	// If no event is triggered, the user gets here from another page. In that case,
176	// we don't set the values
177	if( event ) {
178	// Now determine what action to perform
179	if( event == "next" && handleMissingFields( study, params ) ) {
180	if( session.simpleWizard.imported.numInvalidEntities == 0 ) {
181	// Only continue to the next page if the information entered is correct
182
183	// The import of the excel file has finished. Now delete the excelfile
184	if( session.simpleWizard.sampleForm.importFile )
185	fileService.delete( session.simpleWizard.sampleForm.importFile );
186
187	toPage( "assays" );
188	return;
189	}
190	} else if( event == "previous" ) {
191	// THe user may go to the previous page, even if the data is not correct
192	toPage( "columns" );
193	return;
194	}
195	}
196
197	// If any errors have occurred during validation, show them to the user. However,
198	// the same error might have occurred for multiple entities. For that reason,
199	// we only show unique errors
200	def rules
201	if( session.simpleWizard.imported.errors ) {
202	rules = session.simpleWizard.imported.errors*.values().flatten().unique().join( "<br /> \n" );
203	}
204
205	// Give the study and other data to the user
206	[ study: study, imported: session.simpleWizard.imported, rules: rules ]
207	}
208
209	/**
210	* Shows the assay page
211	*/
212	def assays = {
213	// Retrieve the correct study
214	Study study = getStudyInWizard( params );
215	if( !study ) {
216	redirect( controller: 'simpleWizard', action: 'study' );
217	return;
218	}
219
220	Assay assay
221	if( study.assays?.size() ) {
222	assay = study.assays[0];
223	study.removeFromAssays( assay );
224	} else {
225	assay = new Assay();
226	}
227
228	def event = getEvent(params);
229
230	// If any event on this page is triggered, we should save the entered data.
231	// If no event is triggered, the user gets here from another page. In that case,
232	// we don't set the values
233	if( event ) {
234	// Only continue to the next or previous page if the information entered is correct
235	if( event == "skip" ) {
236	// The user may skip the complete assay page
237	toPage( "overview" );
238	return;
239	} else if( handleAssays( assay, params ) ) {
240	study.addToAssays( assay );
241
242	// Now determine what action to perform
243	if( event == "next" && validateObject( study ) ) {
244	toPage( "overview" );
245	return;
246	} else if( event == "previous" ) {
247	toPage( "samples" )
248	return;
249	}
250	}
251	}
252
253	// Give the study to the user
254	[ study: study, assay: assay ]
255	}
256
257	/**
258	* Shows an overview of the entered study
259	*/
260	def overview = {
261	// Retrieve the correct study
262	Study study = getStudyInWizard( params );
263	if( !study ) {
264	redirect( controller: 'simpleWizard', action: 'study' );
265	return;
266	}
267
268	def event = getEvent(params);
269
270	// If any event on this page is triggered, we should save the entered data.
271	// If no event is triggered, the user gets here from another page. In that case,
272	// we don't set the values
273	if( event ) {
274	// Now determine what action to perform
275	if( event == "save" ) {
276	toPage( "save" );
277	return;
278	} else if( event == "previous" ) {
279	toPage( "assay" )
280	return;
281	}
282	}
283
284	// Give the study to the user
285	[ study: study ]
286	}
287
288	def save = {
289	// Retrieve the correct study
290	Study study = getStudyInWizard( params );
291	if( !study ) {
292	redirect( controller: 'simpleWizard', action: 'study' );
293	return;
294	}
295
296	// Make sure all samples are attached to all assays
297	study.assays.each { assay ->
298	assay.samples?.clear();
299	study.samples.each { sample ->
300	assay.addToSamples( sample )
301	}
302	}
303
304	// Save the study
305	if( study.save( flush: true ) ) {
306	// Clear session
307	session.simpleWizard = null;
308
309	flash.message = "Your study is succesfully saved.";
310	} else {
311	flash.error = "An error occurred while saving your study";
312	//validateObject( study );
313	}
314
315	// Give the study to the user
316	[ study: study ]
317	}
318
319	/**
320	* Handles study input
321	* @param study Study to update
322	* @param params Request parameter map
323	* @return True if everything went OK, false otherwise. An error message is put in flash.error
324	*/
325	def handleStudy( study, params ) {
326	// did the study template change?
327	if (params.get('template') && study.template?.name != params.get('template')) {
328	// set the template
329	study.template = Template.findByName(params.remove('template'))
330	}
331
332	// does the study have a template set?
333	if (study.template && study.template instanceof Template) {
334	// yes, iterate through template fields
335	study.giveFields().each() {
336	// and set their values
337	study.setFieldValue(it.name, params.get(it.escapedName()))
338	}
339	}
340
341	// handle public checkbox
342	if (params.get("publicstudy")) {
343	study.publicstudy = params.get("publicstudy")
344	}
345
346	// handle publications
347	handleStudyPublications(study, params)
348
349	// handle contacts
350	handleStudyContacts(study, params)
351
352	// handle users (readers, writers)
353	handleStudyUsers(study, params, 'readers')
354	handleStudyUsers(study, params, 'writers')
355
356	return true
357	}
358
359	/**
360	* Handles the upload of sample data
361	* @param study Study to update
362	* @param params Request parameter map
363	* @return True if everything went OK, false otherwise. An error message is put in flash.error
364	*/
365	def handleSamples( study, params ) {
366	def filename = params.get( 'importfile' );
367
368	// Handle 'existing*' in front of the filename. This is put in front to make a distinction between
369	// an already uploaded file test.txt (maybe moved to some other directory) and a newly uploaded file test.txt
370	// still being in the temporary directory.
371	// This import step doesn't have to make that distinction, since all files remain in the temporary directory.
372	if( filename[0..8] == 'existing*' )
373	filename = filename[9..-1]
374
375	def templateId = params.long( 'template_id' )
376	int sheetIndex = (params.int( 'sheetindex' ) ?: 1 )
377	int dataMatrixStart = (params.int( 'datamatrix_start' ) ?: 2 )
378	int headerRow = (params.int( 'headerrow' ) ?: 1 )
379
380	// Save form data in session
381	session.simpleWizard.sampleForm = [
382	importFile: filename,
383	templateId: templateId,
384	sheetIndex: sheetIndex,
385	dataMatrixStart: dataMatrixStart,
386	headerRow: headerRow
387	];
388
389	// Check whether the template exists
390	if (!templateId \|\| !Template.get( templateId ) ){
391	log.error ".simple study wizard not all fields are filled in"
392	flash.error = "No template was chosen. Please choose a template for the samples you provided."
393	return false
394	}
395
396	def importedfile = fileService.get( filename )
397	def workbook
398	if (importedfile.exists()) {
399	try {
400	workbook = importerService.getWorkbook(new FileInputStream(importedfile))
401	} catch (Exception e) {
402	log.error ".simple study wizard could not load file: " + e
403	flash.error = "The given file doesn't seem to be an excel file. Please provide an excel file for entering samples.";
404	return false
405	}
406	} else {
407	log.error ".simple study wizard no file given";
408	flash.error = "No file was given. Please provide an excel file for entering samples.";
409	return false;
410	}
411
412	if( !workbook ) {
413	log.error ".simple study wizard could not load file into a workbook"
414	flash.error = "The given file doesn't seem to be an excel file. Please provide an excel file for entering samples.";
415	return false
416	}
417
418	def selectedentities = []
419
420	if( !excelChecks( workbook, sheetIndex, headerRow, dataMatrixStart ) )
421	return false;
422
423	// Get the header from the Excel file using the arguments given in the first step of the wizard
424	def importerHeader;
425	def importerDataMatrix;
426
427	try {
428	importerHeader = importerService.getHeader(workbook,
429	sheetIndex - 1, // 0 == first sheet
430	headerRow, // 1 == first row :s
431	dataMatrixStart - 1, // 0 == first row
432	Sample.class)
433
434	importerDataMatrix = importerService.getDatamatrix(
435	workbook,
436	importerHeader,
437	sheetIndex - 1, // 0 == first sheet
438	dataMatrixStart - 1, // 0 == first row
439	5)
440	} catch( Exception e ) {
441	// An error occurred while reading the excel file.
442	log.error ".simple study wizard error while reading the excel file";
443	e.printStackTrace();
444
445	// Show a message to the user
446	flash.error = "An error occurred while reading the excel file. Have you provided the right sheet number and row numbers. Contact your system administrator if this problem persists.";
447	return false;
448	}
449
450	// Save read excel data into session
451	session.simpleWizard.excel = [
452	workbook: workbook,
453	sheetIndex: sheetIndex,
454	dataMatrixStart: dataMatrixStart,
455	headerRow: headerRow,
456	data: [
457	header: importerHeader,
458	dataMatrix: importerDataMatrix
459	]
460	]
461
462	return true
463	}
464
465	/**
466	* Handles the matching of template fields with excel columns by the user
467	* @param study Study to update
468	* @param params Request parameter map
469	* @return True if everything went OK, false otherwise. An error message is put in flash.error
470	* The field session.simpleWizard.imported.numInvalidEntities reflects the number of
471	* entities that have errors, and should be fixed before saving. The errors for those entities
472	* are saved into session.simpleWizard.imported.errors
473	*/
474	def handleColumns( study, params ) {
475	// Find actual Template object from the chosen template name
476	def template = Template.get(session.simpleWizard.sampleForm.templateId)
477	def headers = session.simpleWizard.excel.data.header;
478
479	if( !params.matches ) {
480	log.error( ".simple study wizard no column matches given" );
481	flash.error = "No column matches given";
482	return false;
483	}
484
485	// Retrieve the chosen matches from the request parameters and put them into
486	// the headers-structure, for later reference
487	params.matches.index.each { columnindex, property ->
488	// Create an actual class instance of the selected entity with the selected template
489	// This should be inside the closure because in some cases in the advanced importer, the fields can have different target entities
490	def entityClass = Class.forName( headers[columnindex.toInteger()].entityclass.getName(), true, this.getClass().getClassLoader())
491	def entityObj = entityClass.newInstance(template: template)
492
493	// Store the selected property for this column into the column map for the ImporterService
494	headers[columnindex.toInteger()].property = property
495
496	// Look up the template field type of the target TemplateField and store it also in the map
497	headers[columnindex.toInteger()].templatefieldtype = entityObj.giveFieldType(property)
498
499	// Is a "Don't import" property assigned to the column?
500	headers[columnindex.toInteger()].dontimport = (property == "dontimport") ? true : false
501
502	//if it's an identifier set the mapping column true or false
503	entityObj.giveFields().each {
504	headers[columnindex.toInteger()].identifier = ( it.preferredIdentifier && (it.name == property) )
505	}
506	}
507
508	// Import the workbook and store the table with entity records and store the failed cells
509	def (table, failedcells) = importerService.importData(session.simpleWizard.sampleForm.templateId,
510	session.simpleWizard.excel.workbook,
511	session.simpleWizard.excel.sheetIndex - 1,
512	session.simpleWizard.excel.dataMatrixStart - 1,
513	session.simpleWizard.excel.data.header)
514
515	session.simpleWizard.imported = [
516	data: table,
517	failedCells: failedcells
518	];
519
520	// loop through all entities to validate them and add them to failedcells if an error occurs
521	def numInvalidEntities = 0;
522	def errors = [];
523
524	// Remove all samples
525	study.samples?.clear();
526
527	table.each { record ->
528	record.each { entity ->
529	// Determine entity class and add a parent
530	entity.parent = study
531	study.addToSamples( entity );
532
533	if (!entity.validate()) {
534	numInvalidEntities++;
535
536	// Add this field to the list of failed cells, in order to give the user feedback
537	failedcells = addNonValidatingCells( failedcells, entity )
538
539	// Also create a full list of errors
540	errors += getHumanReadableErrors( entity );
541	}
542	}
543	}
544
545	session.simpleWizard.imported.numInvalidEntities = numInvalidEntities;
546	session.simpleWizard.imported.errors = errors;
547
548	return true
549	}
550
551	/**
552	* Handles the update of the edited fields by the user
553	* @param study Study to update
554	* @param params Request parameter map
555	* @return True if everything went OK, false otherwise. An error message is put in flash.error.
556	* The field session.simpleWizard.imported.numInvalidEntities reflects the number of
557	* entities that still have errors, and should be fixed before saving. The errors for those entities
558	* are saved into session.simpleWizard.imported.errors
559	*/
560	def handleMissingFields( study, params ) {
561	def numInvalidEntities = 0;
562	def errors = [];
563
564	// Remove all samples before adding them again
565	study.samples?.clear();
566
567	// Check which fields failed previously
568	def failedCells = session.simpleWizard.imported.failedCells
569
570	session.simpleWizard.imported.data.each { table ->
571	table.each { entity ->
572	def invalidFields = 0
573
574	// Set the fields for this entity by retrieving values from the params
575	entity.giveFields().each { field ->
576	def fieldName = importerService.getFieldNameInTableEditor( entity, field );
577
578	if( params[ fieldName ] == "#invalidterm" ) {
579	// If the value '#invalidterm' is chosen, the user hasn't fixed anything, so this field is still incorrect
580	invalidFields++;
581	} else {
582	if( field.type == org.dbnp.gdt.TemplateFieldType.ONTOLOGYTERM \|\| field.type == org.dbnp.gdt.TemplateFieldType.STRINGLIST ) {
583	// If this field is an ontologyterm field or a stringlist field, the value has changed, so remove the field from
584	// the failedCells list
585	importerService.removeFailedCell( failedCells, entity, field )
586	}
587
588	// Update the field, regardless of the type of field
589	entity.setFieldValue(field.name, params[ fieldName ] )
590	}
591	}
592
593	// Determine entity class and add a parent
594	entity.parent = study;
595	study.addToSamples( entity );
596
597	// Try to validate the entity now all fields have been set. If it fails, return an error
598	if (!entity.validate() \|\| invalidFields) {
599	numInvalidEntities++;
600
601	// Add this field to the list of failed cells, in order to give the user feedback
602	failedCells = addNonValidatingCells( failedCells, entity )
603
604	// Also create a full list of errors
605	errors += getHumanReadableErrors( entity );
606	} else {
607	importerService.removeFailedCell( failedCells, entity )
608	}
609	} // end of record
610	} // end of table
611
612	session.simpleWizard.imported.numInvalidEntities = numInvalidEntities;
613	session.simpleWizard.imported.errors = errors;
614
615	return true
616	}
617
618	/**
619	* Handles assay input
620	* @param study Study to update
621	* @param params Request parameter map
622	* @return True if everything went OK, false otherwise. An error message is put in flash.error
623	*/
624	def handleAssays( assay, params ) {
625	// did the study template change?
626	if (params.get('template') && assay.template?.name != params.get('template')) {
627	// set the template
628	assay.template = Template.findByName(params.remove('template'))
629	}
630
631	// does the study have a template set?
632	if (assay.template && assay.template instanceof Template) {
633	// yes, iterate through template fields
634	assay.giveFields().each() {
635	// and set their values
636	assay.setFieldValue(it.name, params.get(it.escapedName()))
637	}
638	}
639
640	return true
641	}
642
643	/**
644	* Validates an object and puts human readable errors in validationErrors variable
645	* @param entity Entity to validate
646	* @return True iff the entity validates, false otherwise
647	*/
648	protected boolean validateObject( def entity ) {
649	if( !entity.validate() ) {
650	flash.validationErrors = getHumanReadableErrors( entity )
651	return false;
652	}
653	return true;
654	}
655
656
657	/**
658	* Adds all fields of this entity that have given an error when validating to the failedcells list
659	* @param failedcells Current list of ImportRecords
660	* @param entity Entity to check. The entity must have been validated before
661	* @return Updated list of ImportRecords
662	*/
663	protected def addNonValidatingCells( failedcells, entity ) {
664	// Add this entity and the fields with an error to the failedCells list
665	ImportRecord failedRecord = new ImportRecord();
666
667	entity.getErrors().getFieldErrors().each { error ->
668	String field = error.getField();
669	def mc = importerService.findMappingColumn( session.simpleWizard.excel.data.header, field );
670	def mcInstance = new MappingColumn( name: field, entityClass: Sample.class, index: -1, property: field.toLowerCase(), templateFieldType: entity.giveFieldType( field ) );
671
672	// Create a clone of the mapping column
673	if( mc ) {
674	mcInstance.properties = mc.properties
675	}
676
677	failedRecord.addToImportcells( new ImportCell(mappingcolumn: mcInstance, value: error.getRejectedValue(), entityidentifier: importerService.getFieldNameInTableEditor( entity, field ) ) )
678	}
679	failedcells.add( failedRecord );
680
681	return failedcells
682	}
683
684
685
686
687	/**
688	* Checks an excel workbook whether the given sheetindex and rownumbers are correct
689	* @param workbook Excel workbook to read
690	* @param sheetIndex 1-based sheet index for the sheet to read (1=first sheet)
691	* @param headerRow 1-based row number for the header row (1=first row)
692	* @param dataMatrixStart 1-based row number for the first data row (1=first row)
693	* @return True if the sheet index and row numbers are correct.
694	*/
695	protected boolean excelChecks( def workbook, int sheetIndex, int headerRow, int dataMatrixStart ) {
696	// Perform some basic checks on the excel file. These checks should be performed by the importerservice
697	// in a perfect scenario.
698	if( sheetIndex > workbook.getNumberOfSheets() ) {
699	log.error ".simple study wizard Sheet index is too high: " + sheetIndex + " / " + workbook.getNumberOfSheets();
700	flash.error = "The sheet number you provided is too high. The provided excel sheet has only " + workbook.getNumberOfSheets() + " sheet(s).";
701	return false
702	}
703
704	def sheet = workbook.getSheetAt(sheetIndex - 1);
705	def firstRowNum = sheet.getFirstRowNum();
706	def lastRowNum = sheet.getLastRowNum();
707	def numRows = lastRowNum - firstRowNum + 1;
708
709	if( headerRow > numRows ) {
710	log.error ".simple study wizard Header row number is incorrect: " + headerRow + " / " + numRows;
711	flash.error = "The header row number you provided is too high. Please provide a number equal to or below " + numRows;
712	return false
713	}
714
715	if( dataMatrixStart > numRows ) {
716	log.error ".simple study wizard Data row number is incorrect: " + dataMatrixStart + " / " + numRows;
717	flash.error = "The data row number you provided is too high. Please provide a number equal to or below " + numRows;
718	return false
719	}
720
721	return true;
722	}
723
724	/**
725	* Redirects the user to the page with the given name
726	* @param action
727	*/
728	protected void toPage( String action ) {
729	println "Redirecting to: " + action;
730	redirect( action: action, params: [ "wizard": true ] );
731	}
732
733	/**
734	* Returns the event that is specified by the user form
735	* @param params
736	* @return
737	*/
738	protected String getEvent( def params ) {
739	return params.get( 'event' );
740	}
741
742	/**
743	* Retrieves the required study from the database or return an empty Study object if
744	* no id is given
745	*
746	* @param params Request parameters with params.id being the ID of the study to be retrieved
747	* @return A study from the database or an empty study if no id was given
748	*/
749	protected Study getStudyFromRequest( def params ) {
750	int id = params.int( "id" );
751
752	if( !id ) {
753	return new Study( title: "New study", owner: authenticationService.getLoggedInUser() );
754	}
755
756	Study s = Study.get( id );
757
758	if( !s.canWrite( authenticationService.getLoggedInUser() ) ) {
759	flash.error = "No authorization to edit this study."
760	return null;
761	}
762
763	return s
764	}
765
766	/**
767	* Retrieves the study that is saved in the wizard,
768	*
769	* @param params Request parameters
770	* @return The found study object, or null if no study object is found
771	*/
772	protected Study getStudyInWizard( def params ) {
773	if( params.wizard && session.simpleWizard && session.simpleWizard.study ) {
774	// The user came here by clicking previous or a link on another page. Use the existing study
775	return session.simpleWizard.study;
776	} else {
777	// The user didn't get here from the wizard or no study is found
778	return null;
779	}
780	}
781
782	/**
783	* transform domain class validation errors into a human readable
784	* linked hash map
785	* @param object validated domain class
786	* @return object linkedHashMap
787	*/
788	def getHumanReadableErrors(object) {
789	def errors = [:]
790	object.errors.getAllErrors().each() { error ->
791	// error.codes.each() { code -> println code }
792
793	// generally speaking g.message(...) should work,
794	// however it fails in some steps of the wizard
795	// (add event, add assay, etc) so g is not always
796	// availably. Using our own instance of the
797	// validationTagLib instead so it is always
798	// available to us
799	errors[error.getArguments()[0]] = validationTagLib.message(error: error)
800	}
801
802	return errors
803	}
804
805	}

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