first commit

libs/api/tracker/application/src/lib/commands/assign-issue.command-handler.ts

@@ -0,0 +1,23 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
+import { CommandResult, ack } from './command-result';
+import { AssignIssueCommand } from './assign-issue.command';
+import { WriteAccess } from './write-access';
+
+@CommandHandler(AssignIssueCommand)
+export class AssignIssueCommandHandler
+  implements ICommandHandler<AssignIssueCommand>
+{
+  constructor(private readonly access: WriteAccess) {}
+
+  async execute(command: AssignIssueCommand): Promise<CommandResult> {
+    const { issue, project } = await this.access.issueForContributor(
+      command.issueId,
+      command.actorId,
+    );
+    if (command.assigneeId)
+      this.access.assertAssignable(project, command.assigneeId);
+    issue.assign(command.actorId, command.assigneeId);
+    await issue.commitAndWait();
+    return ack(issue);
+  }
+}