【发布时间】：2017-11-02 15:25:18
【问题描述】：
我正在测试一个基于酒店搜索的场景。 所以我做了 3 个模型类，分别是 Hotel、Room 和 Availability
以下是我们使用的三个模型类。
Hotel.java
@Document(collection = "酒店") 公共类酒店{
@Id
private String id;
private String name;
private Long pincode;
@Field("roomCategoryDocs")
private Object roomCategoryDocs;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Long getPincode() {
return pincode;
}
public void setPincode(Long pincode) {
this.pincode = pincode;
}
public Object getRoomCategoryDocs() {
return roomCategoryDocs;
}
public void setRoomCategoryDocs(Object roomCategoryDocs) {
this.roomCategoryDocs = roomCategoryDocs;
}
@Override
public String toString() {
return String.format("Hotel [id=%s, name=%s, pincode=%s, roomCategoryDocs=%s]", id, name, pincode,
roomCategoryDocs);
}
}
Room.java
@Document(collection = "房间") 公共课室{
@Id
private String id;
private String frontImg;
private String category;
private ObjectId hotelId;
@Field("availabilityDocs")
private Object availabilityDocs;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFrontImg() {
return frontImg;
}
public void setFrontImg(String frontImg) {
this.frontImg = frontImg;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public ObjectId getHotelId() {
return hotelId;
}
public void setHotelId(ObjectId hotelId) {
this.hotelId = hotelId;
}
public Object getAvailabilityDocs() {
return availabilityDocs;
}
public void setAvailabilityDocs(Object availabilityDocs) {
this.availabilityDocs = availabilityDocs;
}
@Override
public String toString() {
return String.format("Room [id=%s, frontImg=%s, category=%s, hotelId=%s, availabilityDocs=%s]", id, frontImg,
category, hotelId, availabilityDocs);
}
}
可用性.java
@Document(collection = "房间") 公共类可用性{
@Id
private String id;
private ObjectId roomId;
private Integer availability;
private Double rate;
private String date;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public ObjectId getRoomId() {
return roomId;
}
public void setRoomId(ObjectId roomId) {
this.roomId = roomId;
}
public Integer getAvailability() {
return availability;
}
public void setAvailability(Integer availability) {
this.availability = availability;
}
public Double getRate() {
return rate;
}
public void setRate(Double rate) {
this.rate = rate;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
@Override
public String toString() {
return String.format("Availability [id=%s, roomId=%s, availability=%s, rate=%s, date=%s]", id, roomId,
availability, rate, date);
}
}
这些存储在两个 mongodb 集合中，一个用于 Hotel，另一个用于 Room 和可用性。
下面是我们从中获取数据的控制器类的方法
@GetMapping(value = "/hotel") 公共列表 getAllHotel() {
Aggregation agg = newAggregation(match(Criteria.where("pincode").lt(800080)),
lookup("rooms", "_id", "hotelId", "roomCategoryDocs"), unwind("roomCategoryDocs", true),
lookup("rooms", "roomCategoryDocs._id", "roomId", "roomCategoryDocs.availabilityDocs"),
unwind("roomCategoryDocs", true),
group("_id").first("name").as("name").last("pincode").as("pincode").push("roomCategoryDocs").as("roomCategoryDocs")
);
// Convert the aggregation result into a List
AggregationResults<Hotel> groupResults = mongoTemplate.aggregate(agg, "Hotels", Hotel.class);
List<Hotel> result = groupResults.getMappedResults();
return result;
}
现在，在获取酒店数据时，我们正在获取所有数据，包括房间和空房情况。
我们得到的输出：
[
{
"id": "59fabce1acd8be143417b101",
"name": "Elegance",
"pincode": 700042,
"availabilityDocs": [
{
"id": "59fabe39acd8be143417b103",
"frontImg": "google.com/1234",
"category": "Deluxe",
"hotelId": {
"timestamp": 1509604577,
"machineIdentifier": 11327678,
"processIdentifier": 5172,
"counter": 1552641,
"timeSecond": 1509604577,
"time": 1509604577000,
"date": 1509604577000
},
"availabilityDocs1": [
{
"id": "59fabf66acd8be14344a2df3",
"roomId": {
"timestamp": 1509604921,
"machineIdentifier": 11327678,
"processIdentifier": 5172,
"counter": 1552643,
"timeSecond": 1509604921,
"time": 1509604921000,
"date": 1509604921000
},
"availability": 10,
"rate": 4000,
"date": "2017-10-11"
},
{
"id": "59fae259acd8be264cf4430f",
"roomId": {
"timestamp": 1509604921,
"machineIdentifier": 11327678,
"processIdentifier": 5172,
"counter": 1552643,
"timeSecond": 1509604921,
"time": 1509604921000,
"date": 1509604921000
},
"availability": 11,
"rate": 4001,
"date": "2017-10-12"
}
]
}
]
}
]
但是现在我们被困在一个问题上，那就是根据日期属性进行搜索。
预期输出：
这里我们只想获取 2017 年 11 月 10 日的数据。
{
"id": "59fabce1acd8be143417b101",
"name": "Elegance",
"pincode": 700042,
"availabilityDocs": [
{
"id": "59fabe39acd8be143417b103",
"frontImg": "google.com/1234",
"category": "Deluxe",
"hotelId": {
"timestamp": 1509604577,
"machineIdentifier": 11327678,
"processIdentifier": 5172,
"counter": 1552641,
"timeSecond": 1509604577,
"time": 1509604577000,
"date": 1509604577000
},
"availabilityDocs1": [
{
"id": "59fabf66acd8be14344a2df3",
"roomId": {
"timestamp": 1509604921,
"machineIdentifier": 11327678,
"processIdentifier": 5172,
"counter": 1552643,
"timeSecond": 1509604921,
"time": 1509604921000,
"date": 1509604921000
},
"availability": 10,
"rate": 4000,
"date": "2017-10-11"
}
}
下面是json集合示例 酒店系列：
{
"_id" : ObjectId("59fabce1acd8be143417b101"), "name" : "Elegance", "pincode" :
NumberLong(700042), "_class" : "com.lara.mongodb.domain.Hotel"
}
房间集合示例：
{
"_id" : ObjectId("59fabf66acd8be14344a2df3"),
"roomId" : ObjectId("59fabe39acd8be143417b103"),
"availability" : 10,
"rate" : 4000,
"date" : "2017-10-11",
"_class" : "com.lara.mongodb.domain.Availability"
}
我愿意接受有关设计的任何建议以及您可能有的任何其他想法，因为我是新手。 任何帮助将不胜感激。谢谢。
【问题讨论】：
-
可用性实体是某个集合的嵌入文档，还是您将结果写入单独的集合。如果您可以添加一个 json 示例来说明您的酒店和房间集合的外观，这也会有所帮助。
-
嗨，Alex，我们只使用 2 个集合，即酒店和客房。我们的收藏中没有嵌入任何内容。我还添加了您要求的 json 示例。