refactored filter service

- I wasn't too happy with that in the end.
- The filter editor should not be concerned about managing filter rule state.
- Therefore, it should not access a service for filter rules.
- The editor should simply be given a set of rules, and edit that rule set.
- The only entity that should manage filter state should be the document list service, and the saved view service in the form of filters associated with saved views.

src-ui/src/app/components/document-list/document-list.component.html

@@ -63,7 +63,7 @@
 </app-page-header>
 
 <div class="w-100 mb-4">
-  <app-filter-editor [(filterEditorService)]="filterEditorService" (apply)="applyFilterRules()" (clear)="clearFilterRules()" #filterEditor></app-filter-editor>
+  <app-filter-editor [(filterRules)]="list.filterRules" #filterEditor></app-filter-editor>
 </div>
 
 <div class="d-flex justify-content-between align-items-center">

src-ui/src/app/components/document-list/document-list.component.ts

@@ -2,21 +2,14 @@ import { Component, OnInit, ViewChild } from '@angular/core';
 import { Title } from '@angular/platform-browser';
 import { ActivatedRoute } from '@angular/router';
 import { NgbModal } from '@ng-bootstrap/ng-bootstrap';
-import { cloneFilterRules, FilterRule } from 'src/app/data/filter-rule';
-import { FILTER_CORRESPONDENT, FILTER_DOCUMENT_TYPE, FILTER_HAS_TAG, FILTER_RULE_TYPES } from 'src/app/data/filter-rule-type';
 import { SavedViewConfig } from 'src/app/data/saved-view-config';
 import { DocumentListViewService } from 'src/app/services/document-list-view.service';
-import { FilterEditorViewService } from 'src/app/services/filter-editor-view.service';
 import { DOCUMENT_SORT_FIELDS } from 'src/app/services/rest/document.service';
 import { SavedViewConfigService } from 'src/app/services/saved-view-config.service';
 import { Toast, ToastService } from 'src/app/services/toast.service';
 import { environment } from 'src/environments/environment';
+import { FilterEditorComponent } from '../filter-editor/filter-editor.component';
 import { SaveViewConfigDialogComponent } from './save-view-config-dialog/save-view-config-dialog.component';
-import { FilterEditorComponent } from 'src/app/components/filter-editor/filter-editor.component';
-import { PaperlessTag } from 'src/app/data/paperless-tag';
-import { PaperlessCorrespondent } from 'src/app/data/paperless-correspondent';
-import { PaperlessDocumentType } from 'src/app/data/paperless-document-type';
-
 @Component({
   selector: 'app-document-list',
   templateUrl: './document-list.component.html',
@@ -27,26 +20,20 @@ export class DocumentListComponent implements OnInit {
   constructor(
     public list: DocumentListViewService,
     public savedViewConfigService: SavedViewConfigService,
-    public filterEditorService: FilterEditorViewService,
     public route: ActivatedRoute,
     private toastService: ToastService,
     public modalService: NgbModal,
     private titleService: Title) { }
 
+  @ViewChild("filterEditor")
+  private filterEditor: FilterEditorComponent
+
   displayMode = 'smallCards' // largeCards, smallCards, details
 
   get isFiltered() {
     return this.list.filterRules?.length > 0
   }
 
-  set filterRules(filterRules: FilterRule[]) {
-    this.filterEditorService.filterRules = filterRules
-  }
-
-  get filterRules(): FilterRule[] {
-    return this.filterEditorService.filterRules
-  }
-
   getTitle() {
     return this.list.savedViewTitle || "Documents"
   }
@@ -66,29 +53,18 @@ export class DocumentListComponent implements OnInit {
     this.route.paramMap.subscribe(params => {
       if (params.has('id')) {
         this.list.savedView = this.savedViewConfigService.getConfig(params.get('id'))
-        this.filterEditorService.filterRules = this.list.filterRules
         this.titleService.setTitle(`${this.list.savedView.title} - ${environment.appTitle}`)
       } else {
         this.list.savedView = null
-        this.filterEditorService.filterRules = this.list.filterRules
         this.titleService.setTitle(`Documents - ${environment.appTitle}`)
       }
       this.list.clear()
       this.list.reload()
     })
-    this.filterEditorService.filterRules = this.list.filterRules
   }
 
-  applyFilterRules() {
-    this.list.filterRules = this.filterEditorService.filterRules
-  }
-
-  clearFilterRules() {
-    this.list.filterRules = this.filterEditorService.filterRules
-  }
 
   loadViewConfig(config: SavedViewConfig) {
-    this.filterEditorService.filterRules = cloneFilterRules(config.filterRules)
     this.list.load(config)
   }
 
@@ -113,18 +89,15 @@ export class DocumentListComponent implements OnInit {
   }
 
   clickTag(tagID: number) {
-    this.filterEditorService.toggleFilterByTag(tagID)
-    this.applyFilterRules()
+    this.filterEditor.toggleTag(tagID)
   }
 
   clickCorrespondent(correspondentID: number) {
-    this.filterEditorService.toggleFilterByCorrespondent(correspondentID)
-    this.applyFilterRules()
+    this.filterEditor.toggleCorrespondent(correspondentID)
   }
 
   clickDocumentType(documentTypeID: number) {
-    this.filterEditorService.toggleFilterByDocumentType(documentTypeID)
-    this.applyFilterRules()
+    this.filterEditor.toggleDocumentType(documentTypeID)
   }
 
 }

src-ui/src/app/components/filter-editor/filter-dropdown-date/filter-dropdown-date.component.ts

@@ -1,6 +1,4 @@
-import { Component, EventEmitter, Input, Output, ElementRef, ViewChild, OnChanges, SimpleChange } from '@angular/core';
-import { FilterRule } from 'src/app/data/filter-rule';
-import { ObjectWithId } from 'src/app/data/object-with-id';
+import { Component, EventEmitter, Input, Output, ElementRef, ViewChild, SimpleChange } from '@angular/core';
 import { NgbDate, NgbDateStruct, NgbDatepicker } from '@ng-bootstrap/ng-bootstrap';
 
 @Component({

src-ui/src/app/components/filter-editor/filter-editor.component.html

@@ -6,14 +6,14 @@
     <input class="form-control form-control-sm" type="text" [(ngModel)]="titleFilter" placeholder="Title">
   </div>
 
-  <app-filter-dropdown class="col-auto" [(items)]="filterEditorService.tags" [itemsSelected]="filterEditorService.selectedTags" [title]="'Tags'" (toggle)="onToggleTag($event)"></app-filter-dropdown>
-  <app-filter-dropdown class="col-auto" [(items)]="filterEditorService.correspondents" [itemsSelected]="filterEditorService.selectedCorrespondents" [title]="'Correspondents'" (toggle)="onToggleCorrespondent($event)"></app-filter-dropdown>
-  <app-filter-dropdown class="col-auto" [(items)]="filterEditorService.documentTypes" [itemsSelected]="filterEditorService.selectedDocumentTypes" [title]="'Document Types'" (toggle)="onToggleDocumentType($event)"></app-filter-dropdown>
+  <app-filter-dropdown class="col-auto" [items]="tags" [itemsSelected]="selectedTags" title="Tags" (toggle)="toggleTag($event.id)"></app-filter-dropdown>
+  <app-filter-dropdown class="col-auto" [items]="correspondents" [itemsSelected]="selectedCorrespondents" title="Correspondents" (toggle)="toggleCorrespondent($event.id)"></app-filter-dropdown>
+  <app-filter-dropdown class="col-auto" [items]="documentTypes" [itemsSelected]="selectedDocumentTypes" title="Document Types" (toggle)="toggleDocumentType($event.id)"></app-filter-dropdown>
 
-  <app-filter-dropdown-date class="col-auto" [dateBefore]="filterEditorService.dateCreatedBefore" [dateAfter]="filterEditorService.dateCreatedAfter" [title]="'Created'" (dateBeforeSet)="onDateCreatedBeforeSet($event)" (dateAfterSet)="onDateCreatedAfterSet($event)"></app-filter-dropdown-date>
-  <app-filter-dropdown-date class="col-auto" [dateBefore]="filterEditorService.dateAddedBefore" [dateAfter]="filterEditorService.dateAddedAfter" [title]="'Added'"  (dateBeforeSet)="onDateAddedBeforeSet($event)" (dateAfterSet)="onDateAddedAfterSet($event)"></app-filter-dropdown-date>
+  <app-filter-dropdown-date class="col-auto" [dateBefore]="dateCreatedBefore" [dateAfter]="dateCreatedAfter" title="Created" (dateBeforeSet)="onDateCreatedBeforeSet($event)" (dateAfterSet)="onDateCreatedAfterSet($event)"></app-filter-dropdown-date>
+  <app-filter-dropdown-date class="col-auto" [dateBefore]="dateAddedBefore" [dateAfter]="dateAddedAfter" title="Added"  (dateBeforeSet)="onDateAddedBeforeSet($event)" (dateAfterSet)="onDateAddedAfterSet($event)"></app-filter-dropdown-date>
 
-  <button class="btn btn-link btn-sm" [disabled]="!filterEditorService.hasFilters()" (click)="clearSelected()">
+  <button class="btn btn-link btn-sm" [disabled]="!hasFilters()" (click)="clearSelected()">
     <svg width="1em" height="1em" viewBox="0 0 16 16" class="bi bi-x" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
       <path fill-rule="evenodd" d="M4.646 4.646a.5.5 0 0 1 .708 0L8 7.293l2.646-2.647a.5.5 0 0 1 .708.708L8.707 8l2.647 2.646a.5.5 0 0 1-.708.708L8 8.707l-2.646 2.647a.5.5 0 0 1-.708-.708L7.293 8 4.646 5.354a.5.5 0 0 1 0-.708z"/>
     </svg>

src-ui/src/app/components/filter-editor/filter-editor.component.ts

@@ -1,11 +1,15 @@
 import { Component, EventEmitter, Input, Output, OnInit, OnDestroy } from '@angular/core';
-import { FilterEditorViewService } from 'src/app/services/filter-editor-view.service'
 import { PaperlessTag } from 'src/app/data/paperless-tag';
 import { PaperlessCorrespondent } from 'src/app/data/paperless-correspondent';
 import { PaperlessDocumentType } from 'src/app/data/paperless-document-type';
 import { Subject, Subscription } from 'rxjs';
 import { debounceTime, distinctUntilChanged } from 'rxjs/operators';
 import { NgbDateStruct } from '@ng-bootstrap/ng-bootstrap';
+import { DocumentTypeService } from 'src/app/services/rest/document-type.service';
+import { TagService } from 'src/app/services/rest/tag.service';
+import { CorrespondentService } from 'src/app/services/rest/correspondent.service';
+import { FilterRule } from 'src/app/data/filter-rule';
+import { FILTER_ADDED_AFTER, FILTER_ADDED_BEFORE, FILTER_CORRESPONDENT, FILTER_CREATED_AFTER, FILTER_CREATED_BEFORE, FILTER_DOCUMENT_TYPE, FILTER_HAS_TAG, FILTER_RULE_TYPES, FILTER_TITLE } from 'src/app/data/filter-rule-type';
 
 @Component({
   selector: 'app-filter-editor',
@@ -14,19 +18,44 @@ import { NgbDateStruct } from '@ng-bootstrap/ng-bootstrap';
 })
 export class FilterEditorComponent implements OnInit, OnDestroy {
 
-  constructor() { }
+  constructor(
+    private documentTypeService: DocumentTypeService,
+    private tagService: TagService,
+    private correspondentService: CorrespondentService
+  ) { }
+
+  tags: PaperlessTag[] = []
+  correspondents: PaperlessCorrespondent[]
+  documentTypes: PaperlessDocumentType[] = []
 
   @Input()
-  filterEditorService: FilterEditorViewService
+  filterRules: FilterRule[]
 
   @Output()
-  clear = new EventEmitter()
+  filterRulesChange = new EventEmitter<FilterRule[]>()
+  
+  hasFilters() {
+    return this.filterRules.length > 0
+  }
 
-  @Output()
-  apply = new EventEmitter()
+  get selectedTags(): PaperlessTag[] {
+    let tagRules: FilterRule[] = this.filterRules.filter(fr => fr.type.id == FILTER_HAS_TAG)
+    return this.tags?.filter(t => tagRules.find(tr => tr.value == t.id))
+  }
+
+  get selectedCorrespondents(): PaperlessCorrespondent[] {
+    let correspondentRules: FilterRule[] = this.filterRules.filter(fr => fr.type.id == FILTER_CORRESPONDENT)
+    return this.correspondents?.filter(c => correspondentRules.find(cr => cr.value == c.id))
+  }
+
+  get selectedDocumentTypes(): PaperlessDocumentType[] {
+    let documentTypeRules: FilterRule[] = this.filterRules.filter(fr => fr.type.id == FILTER_DOCUMENT_TYPE)
+    return this.documentTypes?.filter(dt => documentTypeRules.find(dtr => dtr.value == dt.id))
+  }
 
   get titleFilter() {
-    return this.filterEditorService.titleFilter
+    let existingRule = this.filterRules.find(rule => rule.type.id == FILTER_TITLE)
+    return existingRule ? existingRule.value : ''
   }
 
   set titleFilter(value) {
@@ -37,13 +66,18 @@ export class FilterEditorComponent implements OnInit, OnDestroy {
   subscription: Subscription
 
   ngOnInit() {
+    this.tagService.listAll().subscribe(result => this.tags = result.results)
+    this.correspondentService.listAll().subscribe(result => this.correspondents = result.results)
+    this.documentTypeService.listAll().subscribe(result => this.documentTypes = result.results)
+
     this.titleFilterDebounce = new Subject<string>()
+
     this.subscription = this.titleFilterDebounce.pipe(
       debounceTime(400),
       distinctUntilChanged()
     ).subscribe(title => {
-      this.filterEditorService.titleFilter = title
-      this.applyFilters()
+      
+      this.setTitleRule(title)
     })
   }
 
@@ -54,46 +88,159 @@ export class FilterEditorComponent implements OnInit, OnDestroy {
   }
 
   applyFilters() {
-    this.apply.next()
+    this.filterRulesChange.next(this.filterRules)
   }
 
   clearSelected() {
-    this.filterEditorService.clear()
-    this.clear.next()
-  }
-
-  onToggleTag(tag: PaperlessTag) {
-    this.filterEditorService.toggleFilterByTag(tag)
+    this.filterRules = []
     this.applyFilters()
   }
 
-  onToggleCorrespondent(correspondent: PaperlessCorrespondent) {
-    this.filterEditorService.toggleFilterByCorrespondent(correspondent)
+  private toggleFilterRule(filterRuleTypeID: number, value: number) {
+
+    let filterRuleType = FILTER_RULE_TYPES.find(t => t.id == filterRuleTypeID)
+
+    let existingRule = this.filterRules.find(rule => rule.type.id == filterRuleTypeID && rule.value == value)
+    let existingRuleOfSameType = this.filterRules.find(rule => rule.type.id == filterRuleTypeID)
+    
+    if (existingRule) {
+      // if this exact rule already exists, remove it in all cases.
+      this.filterRules.splice(this.filterRules.indexOf(existingRule), 1)
+    } else if (filterRuleType.multi || !existingRuleOfSameType) {
+      // if we allow multiple rules per type, or no rule of this type already exists, push a new rule.
+      this.filterRules.push({type: filterRuleType, value: value})
+    } else {
+      // otherwise (i.e., no multi support AND there's already a rule of this type), update the rule.
+      existingRuleOfSameType.value = value
+    }
     this.applyFilters()
   }
 
-  onToggleDocumentType(documentType: PaperlessDocumentType) {
-    this.filterEditorService.toggleFilterByDocumentType(documentType)
+  private setTitleRule(title: string) {
+    let existingRule = this.filterRules.find(rule => rule.type.id == FILTER_TITLE)
+
+    if (!existingRule && title) {
+      this.filterRules.push({type: FILTER_RULE_TYPES.find(t => t.id == FILTER_TITLE), value: title})
+    } else if (existingRule && !title) {
+      this.filterRules.splice(this.filterRules.findIndex(rule => rule.type.id == FILTER_TITLE), 1)
+    } else if (existingRule && title) {
+      existingRule.value = title
+    }
     this.applyFilters()
   }
 
+  toggleTag(tagId: number) {
+    this.toggleFilterRule(FILTER_HAS_TAG, tagId)
+  }
+
+  toggleCorrespondent(correspondentId: number) {
+    this.toggleFilterRule(FILTER_CORRESPONDENT, correspondentId)
+  }
+
+  toggleDocumentType(documentTypeId: number) {
+    this.toggleFilterRule(FILTER_DOCUMENT_TYPE, documentTypeId)
+  }
+
+
+
+  // Date handling
+
+
   onDateCreatedBeforeSet(date: NgbDateStruct) {
-    this.filterEditorService.setDateCreatedBefore(date)
+    this.setDateCreatedBefore(date)
     this.applyFilters()
   }
 
   onDateCreatedAfterSet(date: NgbDateStruct) {
-    this.filterEditorService.setDateCreatedAfter(date)
+    this.setDateCreatedAfter(date)
     this.applyFilters()
   }
 
   onDateAddedBeforeSet(date: NgbDateStruct) {
-    this.filterEditorService.setDateAddedBefore(date)
+    this.setDateAddedBefore(date)
     this.applyFilters()
   }
 
   onDateAddedAfterSet(date: NgbDateStruct) {
-    this.filterEditorService.setDateAddedAfter(date)
+    this.setDateAddedAfter(date)
     this.applyFilters()
   }
+
+  get dateCreatedBefore(): NgbDateStruct {
+    let createdBeforeRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_CREATED_BEFORE)
+    return createdBeforeRule ? {
+      year: createdBeforeRule.value.substring(0,4),
+      month: createdBeforeRule.value.substring(5,7),
+      day: createdBeforeRule.value.substring(8,10)
+    } : undefined
+  }
+
+  get dateCreatedAfter(): NgbDateStruct {
+    let createdAfterRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_CREATED_AFTER)
+    return createdAfterRule ? {
+      year: createdAfterRule.value.substring(0,4),
+      month: createdAfterRule.value.substring(5,7),
+      day: createdAfterRule.value.substring(8,10)
+    } : undefined
+  }
+
+  get dateAddedBefore(): NgbDateStruct {
+    let addedBeforeRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_ADDED_BEFORE)
+    return addedBeforeRule ? {
+      year: addedBeforeRule.value.substring(0,4),
+      month: addedBeforeRule.value.substring(5,7),
+      day: addedBeforeRule.value.substring(8,10)
+    } : undefined
+  }
+
+  get dateAddedAfter(): NgbDateStruct {
+    let addedAfterRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_ADDED_AFTER)
+    return addedAfterRule ? {
+      year: addedAfterRule.value.substring(0,4),
+      month: addedAfterRule.value.substring(5,7),
+      day: addedAfterRule.value.substring(8,10)
+    } : undefined
+  }
+
+  setDateCreatedBefore(date?: NgbDateStruct) {
+    if (date) this.setDateFilter(date, FILTER_CREATED_BEFORE)
+    else this.clearDateFilter(FILTER_CREATED_BEFORE)
+  }
+
+  setDateCreatedAfter(date?: NgbDateStruct) {
+    if (date) this.setDateFilter(date, FILTER_CREATED_AFTER)
+    else this.clearDateFilter(FILTER_CREATED_AFTER)
+  }
+
+  setDateAddedBefore(date?: NgbDateStruct) {
+    if (date) this.setDateFilter(date, FILTER_ADDED_BEFORE)
+    else this.clearDateFilter(FILTER_ADDED_BEFORE)
+  }
+
+  setDateAddedAfter(date?: NgbDateStruct) {
+    if (date) this.setDateFilter(date, FILTER_ADDED_AFTER)
+    else this.clearDateFilter(FILTER_ADDED_AFTER)
+  }
+
+  setDateFilter(date: NgbDateStruct, dateRuleTypeID: number) {
+    let filterRules = this.filterRules
+    let existingRule = filterRules.find(rule => rule.type.id == dateRuleTypeID)
+    let newValue = `${date.year}-${date.month.toString().padStart(2,'0')}-${date.day.toString().padStart(2,'0')}` // YYYY-MM-DD
+
+    if (existingRule) {
+      existingRule.value = newValue
+    } else {
+      filterRules.push({type: FILTER_RULE_TYPES.find(t => t.id == dateRuleTypeID), value: newValue})
+    }
+
+    this.filterRules = filterRules
+  }
+
+  clearDateFilter(dateRuleTypeID: number) {
+    let filterRules = this.filterRules
+    let existingRule = filterRules.find(rule => rule.type.id == dateRuleTypeID)
+    filterRules.splice(filterRules.indexOf(existingRule), 1)
+    this.filterRules = filterRules
+  }
+
 }

src-ui/src/app/services/filter-editor-view.service.spec.ts

@@ -1,16 +0,0 @@
-import { TestBed } from '@angular/core/testing';
-
-import { FilterEditorViewService } from './filter-editor-view.service';
-
-describe('FilterEditorViewService', () => {
-  let service: FilterEditorViewService;
-
-  beforeEach(() => {
-    TestBed.configureTestingModule({});
-    service = TestBed.inject(FilterEditorViewService);
-  });
-
-  it('should be created', () => {
-    expect(service).toBeTruthy();
-  });
-});

src-ui/src/app/services/filter-editor-view.service.ts

@@ -1,182 +0,0 @@
-import { Injectable } from '@angular/core';
-import { Observable } from 'rxjs';
-import { TagService } from 'src/app/services/rest/tag.service';
-import { CorrespondentService } from 'src/app/services/rest/correspondent.service';
-import { DocumentTypeService } from 'src/app/services/rest/document-type.service';
-import { ObjectWithId } from 'src/app/data/object-with-id';
-import { FilterRule } from 'src/app/data/filter-rule';
-import { FilterRuleType, FILTER_RULE_TYPES, FILTER_CORRESPONDENT, FILTER_DOCUMENT_TYPE, FILTER_HAS_TAG, FILTER_TITLE, FILTER_ADDED_BEFORE, FILTER_ADDED_AFTER, FILTER_CREATED_BEFORE, FILTER_CREATED_AFTER, FILTER_CREATED_YEAR, FILTER_CREATED_MONTH, FILTER_CREATED_DAY } from 'src/app/data/filter-rule-type';
-import { Results } from 'src/app/data/results'
-import { PaperlessTag } from 'src/app/data/paperless-tag';
-import { PaperlessCorrespondent } from 'src/app/data/paperless-correspondent';
-import { PaperlessDocumentType } from 'src/app/data/paperless-document-type';
-import { NgbDate, NgbDateStruct } from '@ng-bootstrap/ng-bootstrap';
-
-@Injectable({
-  providedIn: 'root'
-})
-export class FilterEditorViewService {
-
-  tags: PaperlessTag[] = []
-  correspondents: PaperlessCorrespondent[]
-  documentTypes: PaperlessDocumentType[] = []
-
-  filterRules: FilterRule[] = []
-
-  constructor(private tagService: TagService, private documentTypeService: DocumentTypeService, private correspondentService: CorrespondentService) {
-    this.tagService.listAll().subscribe(result => this.tags = result.results)
-    this.correspondentService.listAll().subscribe(result => this.correspondents = result.results)
-    this.documentTypeService.listAll().subscribe(result => this.documentTypes = result.results)
-  }
-
-  clear() {
-    this.filterRules = []
-  }
-
-  hasFilters() {
-    return this.filterRules.length > 0
-  }
-
-  set titleFilter(title: string) {
-    let existingRule = this.filterRules.find(rule => rule.type.id == FILTER_TITLE)
-
-    if (!existingRule && title) {
-      this.filterRules.push({type: FILTER_RULE_TYPES.find(t => t.id == FILTER_TITLE), value: title})
-    } else if (existingRule && !title) {
-      this.filterRules.splice(this.filterRules.findIndex(rule => rule.type.id == FILTER_TITLE), 1)
-    } else if (existingRule && title) {
-      existingRule.value = title
-    }
-  }
-
-  get titleFilter(): string {
-    let existingRule = this.filterRules.find(rule => rule.type.id == FILTER_TITLE)
-    return existingRule ? existingRule.value : ''
-  }
-
-  get selectedTags(): PaperlessTag[] {
-    let tagRules: FilterRule[] = this.filterRules.filter(fr => fr.type.id == FILTER_HAS_TAG)
-    return this.tags?.filter(t => tagRules.find(tr => tr.value == t.id))
-  }
-
-  get selectedCorrespondents(): PaperlessCorrespondent[] {
-    let correspondentRules: FilterRule[] = this.filterRules.filter(fr => fr.type.id == FILTER_CORRESPONDENT)
-    return this.correspondents?.filter(c => correspondentRules.find(cr => cr.value == c.id))
-  }
-
-  get selectedDocumentTypes(): PaperlessDocumentType[] {
-    let documentTypeRules: FilterRule[] = this.filterRules.filter(fr => fr.type.id == FILTER_DOCUMENT_TYPE)
-    return this.documentTypes?.filter(dt => documentTypeRules.find(dtr => dtr.value == dt.id))
-  }
-
-  toggleFilterByTag(tag: PaperlessTag | number) {
-    if (typeof tag == 'number') tag = this.tags?.find(t => t.id == tag)
-    this.toggleFilterByItem(tag, FILTER_HAS_TAG)
-  }
-
-  toggleFilterByCorrespondent(correspondent: PaperlessCorrespondent | number) {
-    if (typeof correspondent == 'number') correspondent = this.correspondents?.find(t => t.id == correspondent)
-    this.toggleFilterByItem(correspondent, FILTER_CORRESPONDENT)
-  }
-
-  toggleFilterByDocumentType(documentType: PaperlessDocumentType | number) {
-    if (typeof documentType == 'number') documentType = this.documentTypes?.find(t => t.id == documentType)
-    this.toggleFilterByItem(documentType, FILTER_DOCUMENT_TYPE)
-  }
-
-  private toggleFilterByItem(item: ObjectWithId, filterRuleTypeID: number) {
-    let filterRules = this.filterRules
-    let filterRuleType: FilterRuleType = FILTER_RULE_TYPES.find(t => t.id == filterRuleTypeID)
-    let existingRules = filterRules.filter(rule => rule.type.id == filterRuleType.id)
-    let existingItemRule = existingRules?.find(rule => rule.value == item.id)
-
-    if (existingRules && existingItemRule) { // if exact rule exists just remove
-      filterRules.splice(filterRules.indexOf(existingItemRule), 1)
-    } else if (existingRules.length > 0 && filterRuleType.multi) { // e.g. tags can have multiple
-      filterRules.push({type: filterRuleType, value: item.id})
-    } else if (existingRules.length > 0) { // correspondents & documentTypes can only be one
-      filterRules.find(rule => rule.type.id == filterRuleType.id).value = item.id
-    } else {
-      filterRules.push({type: filterRuleType, value: item.id})
-    }
-
-    this.filterRules = filterRules
-  }
-
-  get dateCreatedBefore(): NgbDateStruct {
-    let createdBeforeRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_CREATED_BEFORE)
-    return createdBeforeRule ? {
-      year: createdBeforeRule.value.substring(0,4),
-      month: createdBeforeRule.value.substring(5,7),
-      day: createdBeforeRule.value.substring(8,10)
-    } : undefined
-  }
-
-  get dateCreatedAfter(): NgbDateStruct {
-    let createdAfterRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_CREATED_AFTER)
-    return createdAfterRule ? {
-      year: createdAfterRule.value.substring(0,4),
-      month: createdAfterRule.value.substring(5,7),
-      day: createdAfterRule.value.substring(8,10)
-    } : undefined
-  }
-
-  get dateAddedBefore(): NgbDateStruct {
-    let addedBeforeRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_ADDED_BEFORE)
-    return addedBeforeRule ? {
-      year: addedBeforeRule.value.substring(0,4),
-      month: addedBeforeRule.value.substring(5,7),
-      day: addedBeforeRule.value.substring(8,10)
-    } : undefined
-  }
-
-  get dateAddedAfter(): NgbDateStruct {
-    let addedAfterRule: FilterRule = this.filterRules.find(fr => fr.type.id == FILTER_ADDED_AFTER)
-    return addedAfterRule ? {
-      year: addedAfterRule.value.substring(0,4),
-      month: addedAfterRule.value.substring(5,7),
-      day: addedAfterRule.value.substring(8,10)
-    } : undefined
-  }
-
-  setDateCreatedBefore(date?: NgbDateStruct) {
-    if (date) this.setDateFilter(date, FILTER_CREATED_BEFORE)
-    else this.clearDateFilter(FILTER_CREATED_BEFORE)
-  }
-
-  setDateCreatedAfter(date?: NgbDateStruct) {
-    if (date) this.setDateFilter(date, FILTER_CREATED_AFTER)
-    else this.clearDateFilter(FILTER_CREATED_AFTER)
-  }
-
-  setDateAddedBefore(date?: NgbDateStruct) {
-    if (date) this.setDateFilter(date, FILTER_ADDED_BEFORE)
-    else this.clearDateFilter(FILTER_ADDED_BEFORE)
-  }
-
-  setDateAddedAfter(date?: NgbDateStruct) {
-    if (date) this.setDateFilter(date, FILTER_ADDED_AFTER)
-    else this.clearDateFilter(FILTER_ADDED_AFTER)
-  }
-
-  setDateFilter(date: NgbDateStruct, dateRuleTypeID: number) {
-    let filterRules = this.filterRules
-    let existingRule = filterRules.find(rule => rule.type.id == dateRuleTypeID)
-    let newValue = `${date.year}-${date.month.toString().padStart(2,'0')}-${date.day.toString().padStart(2,'0')}` // YYYY-MM-DD
-
-    if (existingRule) {
-      existingRule.value = newValue
-    } else {
-      filterRules.push({type: FILTER_RULE_TYPES.find(t => t.id == dateRuleTypeID), value: newValue})
-    }
-
-    this.filterRules = filterRules
-  }
-
-  clearDateFilter(dateRuleTypeID: number) {
-    let filterRules = this.filterRules
-    let existingRule = filterRules.find(rule => rule.type.id == dateRuleTypeID)
-    filterRules.splice(filterRules.indexOf(existingRule), 1)
-    this.filterRules = filterRules
-  }
-}