✨ feat(gvgBattle): 填充接口，通过部分激战期用例测试

shared/db/GVGCity.ts

@@ -10,7 +10,7 @@ export default class GVGCity extends BaseModel {
     @prop({ required: true })
     cityId: number;         // 城池id
 
-    @prop({ required: true })
+    @prop({ required: true, default: [] })
     leagueCodes: string[];  // 联军
 
     @prop({ required: false })
@@ -24,6 +24,20 @@ export default class GVGCity extends BaseModel {
 
     @prop({ required: true, default: 0 })
     teamCnt: number;        // 城池队伍数
+
+    // 创建城市
+    public static async createCity(configId: number, cityId: number) {
+        let doc = new GVGCityModel();
+        let update = Object.assign(doc.toJSON(), { configId, cityId});
+        const city: GVGCityType | null = await GVGCityModel.findOneAndUpdate({ configId, cityId }, { $setOnInsert: update }, { upsert: true, new: true }).lean();
+        return city;
+    }
+
+    // 通过 cityId 获取城市
+    public static async getCityByCityId(cityId: number) {
+        const city: GVGCityType | null = await GVGCityModel.findOne({ cityId }).lean();
+        return city;
+    }
 }