src/main/java/ru/ulstu/conference/repository/ConferenceRepository.java

@@ -16,4 +16,7 @@ public interface ConferenceRepository extends JpaRepository<Conference, Integer>
 
     @Query("SELECT c FROM Conference c WHERE c.beginDate > :date")
     List<Conference> findAllActive(@Param("date") Date date);
+
+    @Query("SELECT case when count(c) > 0 then true else false end FROM Conference c JOIN c.papers p WHERE p.id = :paperId")
+    boolean isPaperAttached(@Param("paperId") Integer paperId);
 }

src/main/java/ru/ulstu/conference/service/ConferenceService.java

@@ -184,4 +184,8 @@ public class ConferenceService {
     public List<Conference> findAllActive() {
         return conferenceRepository.findAllActive(new Date());
     }
+
+    public boolean isAttachedToConference(Integer paperId) {
+        return conferenceRepository.isPaperAttached(paperId);
+    }
 }

src/main/java/ru/ulstu/core/controller/AdviceController.java

@@ -39,6 +39,11 @@ public class AdviceController {
         return userService.getCurrentUser().getUserAbbreviate();
     }
 
+    @ModelAttribute("flashMessage")
+    public String getFlashMessage() {
+        return null;
+    }
+
     private Response<Void> handleException(ErrorConstants error) {
         log.warn(error.toString());
         return new Response<>(error);

src/main/java/ru/ulstu/paper/controller/PaperController.java

@@ -1,6 +1,5 @@
 package ru.ulstu.paper.controller;
 
-import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -9,14 +8,14 @@ import org.springframework.ui.ModelMap;
 import org.springframework.validation.Errors;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ModelAttribute;
-import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
+import ru.ulstu.conference.service.ConferenceService;
 import ru.ulstu.deadline.model.Deadline;
 import ru.ulstu.paper.model.Paper;
 import ru.ulstu.paper.model.PaperDto;
-import ru.ulstu.paper.model.PaperFilterDto;
+import ru.ulstu.paper.model.PaperListDto;
 import ru.ulstu.paper.service.LatexService;
 import ru.ulstu.paper.service.PaperService;
 import ru.ulstu.user.model.User;
@@ -39,23 +38,34 @@ import static org.springframework.util.StringUtils.isEmpty;
 @ApiIgnore
 public class PaperController {
     private final PaperService paperService;
+    private final ConferenceService conferenceService;
     private final LatexService latexService;
 
-    public PaperController(PaperService paperService, LatexService latexService) {
+    public PaperController(PaperService paperService,
+                           ConferenceService conferenceService,
+                           LatexService latexService) {
         this.paperService = paperService;
+        this.conferenceService = conferenceService;
         this.latexService = latexService;
     }
 
     @GetMapping("/papers")
     public void getPapers(ModelMap modelMap) {
-        modelMap.put("filteredPapers", new PaperFilterDto(paperService.findAllDto(), null, null));
+        modelMap.put("filteredPapers", new PaperListDto(paperService.findAllDto(), null, null));
     }
 
     @PostMapping("/papers")
-    public void filterPapers(@Valid PaperFilterDto paperFilterDto, ModelMap modelMap) {
+    public void listPapers(@Valid PaperListDto paperListDto, ModelMap modelMap) {
-        modelMap.put("filteredPapers", new PaperFilterDto(paperService.filter(paperFilterDto),
+        if (paperListDto.getPaperDeleteId() != null) {
-                paperFilterDto.getFilterAuthorId(),
+            if (conferenceService.isAttachedToConference(paperListDto.getPaperDeleteId())) {
-                paperFilterDto.getYear()));
+                modelMap.put("flashMessage", "Статью нельзя удалить, она прикреплена к конференции");
+            } else {
+                paperService.delete(paperListDto.getPaperDeleteId());
+            }
+        }
+        modelMap.put("filteredPapers", new PaperListDto(paperService.filter(paperListDto),
+                paperListDto.getFilterAuthorId(),
+                paperListDto.getYear()));
     }
 
     @GetMapping("/dashboard")
@@ -95,19 +105,6 @@ public class PaperController {
         return "/papers/paper";
     }
 
-    @GetMapping("/delete/{paper-id}")
-    public String delete(@Valid PaperFilterDto paperFilterDto,
-                         @PathVariable("paper-id") Integer paperId,
-                         Errors errors) throws IOException {
-        try {
-            paperService.delete(paperId);
-        } catch (DataIntegrityViolationException e) {
-            errors.reject("relationExist", "Статья прикреплена к конференции");
-            return "/papers/papers";
-        }
-        return "redirect:/papers/papers";
-    }
-
     @ModelAttribute("allStatuses")
     public List<Paper.PaperStatus> getPaperStatuses() {
         return paperService.getPaperStatuses();

src/main/java/ru/ulstu/paper/controller/PaperRestController.java

@@ -11,7 +11,7 @@ import org.springframework.web.bind.annotation.RestController;
 import ru.ulstu.configuration.Constants;
 import ru.ulstu.core.model.response.Response;
 import ru.ulstu.paper.model.PaperDto;
-import ru.ulstu.paper.model.PaperFilterDto;
+import ru.ulstu.paper.model.PaperListDto;
 import ru.ulstu.paper.service.PaperService;
 
 import javax.validation.Valid;
@@ -58,8 +58,8 @@ public class PaperRestController {
     }
 
     @PostMapping("/filter")
-    public Response<List<PaperDto>> filter(@RequestBody @Valid PaperFilterDto paperFilterDto) throws IOException {
+    public Response<List<PaperDto>> filter(@RequestBody @Valid PaperListDto paperListDto) throws IOException {
-        return new Response<>(paperService.filter(paperFilterDto));
+        return new Response<>(paperService.filter(paperListDto));
     }
 
     @GetMapping("formatted-list")

src/main/java/ru/ulstu/paper/model/PaperListDto.java

@@ -2,15 +2,16 @@ package ru.ulstu.paper.model;
 
 import java.util.List;
 
-public class PaperFilterDto {
+public class PaperListDto {
     private List<PaperDto> papers;
     private Integer filterAuthorId;
+    private Integer paperDeleteId;
     private Integer year;
 
-    public PaperFilterDto() {
+    public PaperListDto() {
     }
 
-    public PaperFilterDto(List<PaperDto> paperDtos, Integer filterAuthorId, Integer year) {
+    public PaperListDto(List<PaperDto> paperDtos, Integer filterAuthorId, Integer year) {
         this.papers = paperDtos;
         this.filterAuthorId = filterAuthorId;
         this.year = year;
@@ -39,4 +40,12 @@ public class PaperFilterDto {
     public void setYear(Integer year) {
         this.year = year;
     }
+
+    public Integer getPaperDeleteId() {
+        return paperDeleteId;
+    }
+
+    public void setPaperDeleteId(Integer paperDeleteId) {
+        this.paperDeleteId = paperDeleteId;
+    }
 }

src/main/java/ru/ulstu/paper/service/PaperService.java

@@ -9,7 +9,7 @@ import ru.ulstu.file.model.FileDataDto;
 import ru.ulstu.file.service.FileService;
 import ru.ulstu.paper.model.Paper;
 import ru.ulstu.paper.model.PaperDto;
-import ru.ulstu.paper.model.PaperFilterDto;
+import ru.ulstu.paper.model.PaperListDto;
 import ru.ulstu.paper.repository.PaperRepository;
 import ru.ulstu.timeline.service.EventService;
 import ru.ulstu.user.model.User;
@@ -181,7 +181,7 @@ public class PaperService {
         return paper;
     }
 
-    public List<PaperDto> filter(PaperFilterDto filterDto) {
+    public List<PaperDto> filter(PaperListDto filterDto) {
         return convert(sortPapers(paperRepository.filter(
                 filterDto.getFilterAuthorId() == null ? null : userService.findById(filterDto.getFilterAuthorId()),
                 filterDto.getYear())), PaperDto::new);

src/main/resources/public/js/papers.js

@@ -13,7 +13,8 @@ $(document).ready(function () {
     });
 
     $('a[data-confirm]').click(function(ev) {
-        var href = $(this).attr('href');
+        var id = $(this).parent().parent().find('.id-class').val();
+
         if (!$('#dataConfirmModal').length) {
             $('#modalDelete').append('<div class="modal fade" id="dataConfirmModal"  tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true"\n' +
                 '             >\n' +
@@ -34,7 +35,10 @@ $(document).ready(function () {
                 '        </div>');
         }
         $('#dataConfirmModal').find('#myModalLabel').text($(this).attr('data-confirm'));
-        $('#dataConfirmOK').attr('href', href);
+        $('#dataConfirmOK').click(function () {
+            $("#paperDeleteId").val(id);
+            $('form').submit();
+        });
         $('#dataConfirmModal').modal({show:true});
         return false;
     });

src/main/resources/templates/default.html

@@ -55,7 +55,8 @@
                     <a class="nav-link js-scroll-trigger" target="_blank" href="http://is.ulstu.ru">Сайт кафедры</a>
                 </li>
                 <li class="nav-item">
-                    <a class="nav-link js-scroll-trigger" target="_blank" th:href="@{'http://timetable.athene.tech?filter='+${currentUser}}">Расписание</a>
+                    <a class="nav-link js-scroll-trigger" target="_blank"
+                       th:href="@{'http://timetable.athene.tech?filter='+${currentUser}}">Расписание</a>
                 </li>
                 <li class="nav-item">
                     <a class="nav-link js-scroll-trigger" target="_blank" href="https://kias.rfbr.ru/">КИАС РФФИ</a>
@@ -97,36 +98,53 @@
 <script src="/js/core.js"></script>
 <script src="/js/config.js"></script>
 <script src="/js/odin.js"></script>
+<script th:inline="javascript">
+
+    /*<![CDATA[*/
+    var message = /*[[${flashMessage}]]*/ "";
+    if (message && message.length > 0) {
+        showFeedbackMessage(message, MessageTypesEnum.DANGER);
+    }
+    /*]]>*/
+
+</script>
 <th:block layout:fragment="scripts">
 </th:block>
 <!-- Yandex.Metrika counter -->
-<script type="text/javascript" >
+<script type="text/javascript">
     (function (d, w, c) {
-        (w[c] = w[c] || []).push(function() {
+        (w[c] = w[c] || []).push(function () {
             try {
                 w.yaCounter49387279 = new Ya.Metrika2({
-                    id:49387279,
+                    id: 49387279,
-                    clickmap:true,
+                    clickmap: true,
-                    trackLinks:true,
+                    trackLinks: true,
-                    accurateTrackBounce:true,
+                    accurateTrackBounce: true,
-                    webvisor:true
+                    webvisor: true
                 });
-            } catch(e) { }
+            } catch (e) {
+            }
         });
 
         var n = d.getElementsByTagName("script")[0],
             s = d.createElement("script"),
-            f = function () { n.parentNode.insertBefore(s, n); };
+            f = function () {
+                n.parentNode.insertBefore(s, n);
+            };
         s.type = "text/javascript";
         s.async = true;
         s.src = "https://mc.yandex.ru/metrika/tag.js";
 
         if (w.opera == "[object Opera]") {
             d.addEventListener("DOMContentLoaded", f, false);
-        } else { f(); }
+        } else {
+            f();
+        }
     })(document, window, "yandex_metrika_callbacks2");
 </script>
-<noscript><div><img src="https://mc.yandex.ru/watch/49387279" style="position:absolute; left:-9999px;" alt="" /></div></noscript>
+<noscript>
+    <div><img src="https://mc.yandex.ru/watch/49387279" style="position:absolute; left:-9999px;" alt=""/></div>
+</noscript>
 <!-- /Yandex.Metrika counter -->
 </body>
 </html>

src/main/resources/templates/papers/fragments/paperLineFragment.html

@@ -12,8 +12,7 @@
             <span class="text-muted" th:text="${paper.authorsString}"/>
         </a>
         <input class="id-class" type="hidden" th:value="${paper.id}"/>
-        <a class="remove-paper pull-right d-none" th:href="@{'/papers/delete/'+${paper.id}}"
+        <a class="remove-paper pull-right d-none" href="#" data-confirm="Удалить статью?">
-           data-confirm="Удалить статью?">
             <i class="fa fa-trash" aria-hidden="true"></i>
         </a>
     </div>