Fix: sequence field (#1009)

* fix(database): fix sequence field match last

* fix(database): fix sequence field match last

* fix(database): add test case for sequence field

packages/core/database/src/__tests__/fields/sequence-field.test.ts

@@ -216,6 +216,31 @@ describe('string field', () => {
       const item4 = await TestModel.create();
       expect(item4.get('name')).toBe('1');
     });
+
+    it('last record has no value of this field', async () => {
+      const testCollection = db.collection({
+        name: 'tests',
+        fields: [],
+      });
+      await db.sync();
+
+      const TestModel = db.getModel('tests');
+      const item1 = await TestModel.create();
+      expect(item1.get('name')).toBeUndefined();
+
+      testCollection.addField('name', {
+        type: 'sequence',
+        patterns: [
+          {
+            type: 'integer'
+          }
+        ]
+      });
+      await db.sync();
+
+      const item2 = await TestModel.create();
+      expect(item2.get('name')).toBe('0');
+    });
   });
 
   describe('date pattern', () => {

packages/core/database/src/fields/sequence-field.ts

@@ -44,7 +44,7 @@ sequencePatterns.register('integer', {
     const { lastRecord = null } = this.options;
 
     if (typeof options.current === 'undefined') {
-      if (lastRecord) {
+      if (lastRecord && lastRecord.get(this.options.name)) {
         // if match current pattern
         const matcher = this.match(lastRecord.get(this.options.name));
         if (matcher) {
@@ -115,6 +115,8 @@ export interface SequenceFieldOptions extends BaseColumnFieldOptions {
 }
 
 export class SequenceField extends Field {
+  matcher: RegExp;
+
   get dataType() {
     return DataTypes.STRING;
   }
@@ -170,7 +172,7 @@ export class SequenceField extends Field {
   };
 
   match(value) {
-    return value.match(this.matcher);
+    return typeof value === 'string' ? value.match(this.matcher) : null;
   }
 
   parse(value: string, patternIndex: number): string {