fixes #121

src-ui/src/app/components/common/input/number/number.component.html

@@ -1,8 +1,14 @@
 <div class="form-group">
   <label [for]="inputId">{{title}}</label>
-  <input type="number" class="form-control" [class.is-invalid]="error" [id]="inputId" [(ngModel)]="value" (change)="onChange(value)">
+  <div class="input-group" [class.is-invalid]="error">
-  <small *ngIf="hint" class="form-text text-muted">{{hint}}</small>
+    <input type="number" class="form-control" [id]="inputId" [(ngModel)]="value" (change)="onChange(value)" [class.is-invalid]="error">
+    <div class="input-group-append">
+      <button class="btn btn-outline-secondary" type="button" id="button-addon1" (click)="nextAsn()" [disabled]="value">+1</button>
+    </div>
+  </div>
   <div class="invalid-feedback">
     {{error}}
   </div>
+  <small *ngIf="hint" class="form-text text-muted">{{hint}}</small>
+
 </div>

src-ui/src/app/components/common/input/number/number.component.ts

@@ -1,5 +1,7 @@
 import { Component, forwardRef } from '@angular/core';
 import { NG_VALUE_ACCESSOR } from '@angular/forms';
+import { FILTER_ASN_ISNULL } from 'src/app/data/filter-rule-type';
+import { DocumentService } from 'src/app/services/rest/document.service';
 import { AbstractInputComponent } from '../abstract-input';
 
 @Component({
@@ -14,8 +16,24 @@ import { AbstractInputComponent } from '../abstract-input';
 })
 export class NumberComponent extends AbstractInputComponent<number> {
 
-  constructor() {
+  constructor(private documentService: DocumentService) {
     super()
   }
 
+  nextAsn() {
+    if (this.value) {
+      return
+    }
+    this.documentService.listFiltered(1, 1, "archive_serial_number", true, [{rule_type: FILTER_ASN_ISNULL, value: "false"}]).subscribe(
+      results => {
+        if (results.count > 0) {
+          this.value = results.results[0].archive_serial_number + 1
+        } else {
+          this.value + 1
+        }
+        this.onChange(this.value)
+      }
+    )
+  }
+
 }

src-ui/src/app/data/filter-rule-type.ts

@@ -18,6 +18,8 @@ export const FILTER_MODIFIED_AFTER = 16
 
 export const FILTER_DOES_NOT_HAVE_TAG = 17
 
+export const FILTER_ASN_ISNULL = 18
+
 export const FILTER_RULE_TYPES: FilterRuleType[] = [
 
   {id: FILTER_TITLE, name: "Title contains", filtervar: "title__icontains", datatype: "string", multi: false, default: ""},
@@ -45,6 +47,7 @@ export const FILTER_RULE_TYPES: FilterRuleType[] = [
 
   {id: FILTER_MODIFIED_BEFORE, name: "Modified before", filtervar: "modified__date__lt", datatype: "date", multi: false},
   {id: FILTER_MODIFIED_AFTER, name: "Modified after", filtervar: "modified__date__gt", datatype: "date", multi: false},
+  {id: FILTER_ASN_ISNULL, name: "ASN is null", filtervar: "archive_serial_number__isnull", datatype: "boolean", multi: false}
 ]
 
 export interface FilterRuleType {

src/documents/filters.py

@@ -4,7 +4,7 @@ from .models import Correspondent, Document, Tag, DocumentType, Log
 
 CHAR_KWARGS = ["istartswith", "iendswith", "icontains", "iexact"]
 ID_KWARGS = ["in", "exact"]
-INT_KWARGS = ["exact", "gt", "gte", "lt", "lte"]
+INT_KWARGS = ["exact", "gt", "gte", "lt", "lte", "isnull"]
 DATE_KWARGS = ["year", "month", "day", "date__gt", "gt", "date__lt", "lt"]