Feature: Implement custom fields for documents (#4502)

Adds custom fields of certain data types, attachable to documents and searchable

Co-Authored-By: Trenton H <797416+stumpylog@users.noreply.github.com>

src-ui/src/app/components/document-list/filter-editor/filter-editor.component.spec.ts

@@ -46,6 +46,7 @@ import {
   FILTER_OWNER_ANY,
   FILTER_OWNER_DOES_NOT_INCLUDE,
   FILTER_OWNER_ISNULL,
+  FILTER_CUSTOM_FIELDS,
 } from 'src/app/data/filter-rule-type'
 import { PaperlessCorrespondent } from 'src/app/data/paperless-correspondent'
 import { PaperlessDocumentType } from 'src/app/data/paperless-document-type'
@@ -240,6 +241,18 @@ describe('FilterEditorComponent', () => {
     expect(component.textFilterTarget).toEqual('asn') // TEXT_FILTER_TARGET_ASN
   }))
 
+  it('should ingest text filter rules for custom fields', fakeAsync(() => {
+    expect(component.textFilter).toEqual(null)
+    component.filterRules = [
+      {
+        rule_type: FILTER_CUSTOM_FIELDS,
+        value: 'foo',
+      },
+    ]
+    expect(component.textFilter).toEqual('foo')
+    expect(component.textFilterTarget).toEqual('custom-fields') // TEXT_FILTER_TARGET_CUSTOM_FIELDS
+  }))
+
   it('should ingest text filter rules for doc asn is null', fakeAsync(() => {
     expect(component.textFilterTarget).toEqual('title-content')
     expect(component.textFilterModifier).toEqual('equals') // TEXT_FILTER_MODIFIER_EQUALS
@@ -956,12 +969,30 @@ describe('FilterEditorComponent', () => {
     ])
   }))
 
-  it('should convert user input to correct filter rules on full text query', fakeAsync(() => {
+  it('should convert user input to correct filter rules on custom fields query', fakeAsync(() => {
     component.textFilterInput.nativeElement.value = 'foo'
     component.textFilterInput.nativeElement.dispatchEvent(new Event('input'))
     const textFieldTargetDropdown = fixture.debugElement.queryAll(
       By.directive(NgbDropdownItem)
     )[3]
+    textFieldTargetDropdown.triggerEventHandler('click') // TEXT_FILTER_TARGET_CUSTOM_FIELDS
+    fixture.detectChanges()
+    tick(400)
+    expect(component.textFilterTarget).toEqual('custom-fields')
+    expect(component.filterRules).toEqual([
+      {
+        rule_type: FILTER_CUSTOM_FIELDS,
+        value: 'foo',
+      },
+    ])
+  }))
+
+  it('should convert user input to correct filter rules on full text query', fakeAsync(() => {
+    component.textFilterInput.nativeElement.value = 'foo'
+    component.textFilterInput.nativeElement.dispatchEvent(new Event('input'))
+    const textFieldTargetDropdown = fixture.debugElement.queryAll(
+      By.directive(NgbDropdownItem)
+    )[4]
     textFieldTargetDropdown.triggerEventHandler('click') // TEXT_FILTER_TARGET_ASN
     fixture.detectChanges()
     tick(400)

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

@@ -48,6 +48,7 @@ import {
   FILTER_OWNER_DOES_NOT_INCLUDE,
   FILTER_OWNER_ISNULL,
   FILTER_OWNER_ANY,
+  FILTER_CUSTOM_FIELDS,
 } from 'src/app/data/filter-rule-type'
 import {
   FilterableDropdownSelectionModel,
@@ -74,6 +75,7 @@ const TEXT_FILTER_TARGET_TITLE_CONTENT = 'title-content'
 const TEXT_FILTER_TARGET_ASN = 'asn'
 const TEXT_FILTER_TARGET_FULLTEXT_QUERY = 'fulltext-query'
 const TEXT_FILTER_TARGET_FULLTEXT_MORELIKE = 'fulltext-morelike'
+const TEXT_FILTER_TARGET_CUSTOM_FIELDS = 'custom-fields'
 
 const TEXT_FILTER_MODIFIER_EQUALS = 'equals'
 const TEXT_FILTER_MODIFIER_NULL = 'is null'
@@ -204,6 +206,10 @@ export class FilterEditorComponent implements OnInit, OnDestroy {
         name: $localize`Title & content`,
       },
       { id: TEXT_FILTER_TARGET_ASN, name: $localize`ASN` },
+      {
+        id: TEXT_FILTER_TARGET_CUSTOM_FIELDS,
+        name: $localize`Custom fields`,
+      },
       {
         id: TEXT_FILTER_TARGET_FULLTEXT_QUERY,
         name: $localize`Advanced search`,
@@ -321,6 +327,10 @@ export class FilterEditorComponent implements OnInit, OnDestroy {
           this._textFilter = rule.value
           this.textFilterTarget = TEXT_FILTER_TARGET_ASN
           break
+        case FILTER_CUSTOM_FIELDS:
+          this._textFilter = rule.value
+          this.textFilterTarget = TEXT_FILTER_TARGET_CUSTOM_FIELDS
+          break
         case FILTER_FULLTEXT_QUERY:
           let allQueryArgs = rule.value.split(',')
           let textQueryArgs = []
@@ -552,6 +562,15 @@ export class FilterEditorComponent implements OnInit, OnDestroy {
         })
       }
     }
+    if (
+      this._textFilter &&
+      this.textFilterTarget == TEXT_FILTER_TARGET_CUSTOM_FIELDS
+    ) {
+      filterRules.push({
+        rule_type: FILTER_CUSTOM_FIELDS,
+        value: this._textFilter,
+      })
+    }
     if (
       this._textFilter &&
       this.textFilterTarget == TEXT_FILTER_TARGET_FULLTEXT_QUERY