api响应（www.railwayapi.com/api/#trains-between-stations）不包含任何PrimaryKey字段（api不在我的控制之下），所以我创建了另一个类并设置了PK和响应它。 我在StackOverflow上经历了所有类似的问题，并做了相应的工作。数据（使用Retrofit获取）仍然反复插入Realm而不是更新。我该如何解决这个问题？
这就是我将数据保存到Realm的方式：（已编辑）
private void loadJSON(){
SearchResultsApiInterface apiService = SearchResultsApiClient.getClient().create(SearchResultsApiInterface.class);
Call<SearchResultsResponse> call = apiService.getTrainNameResponse(SSC,DSC,DATE,API_KEY);
call.enqueue(new Callback<SearchResultsResponse>() {
@Override
public void onResponse(Call<SearchResultsResponse> call, Response<SearchResultsResponse> response) {
final SearchResultsResponse jsonResponse = response.body();
jsonResponse.setKey(SSC+DSC+DATE); //EDITED (SSC,DSC,DATE are the EditText valus enter by user)
final List<Train> data = jsonResponse.getTrain();
String from = data.get(0).getFrom().getCode();
String to = data.get(0).getTo().getCode();
transaction = realm.executeTransactionAsync(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
realm.insertOrUpdate(jsonResponse);
}
}, new Realm.Transaction.OnSuccess() {
@Override
public void onSuccess() {
Toast.makeText(getApplicationContext(),"Data saved", Toast.LENGTH_LONG).show();}
}, new Realm.Transaction.OnError() {
@Override
public void onError(Throwable error) {
Toast.makeText(getApplicationContext(),"Error in saving",Toast.LENGTH_LONG).show();}
});
SearchResultsDataAdapter adapter = new SearchResultsDataAdapter(MainActivity.this,traindata);
recyclerView.setAdapter(adapter);
String toolbarTitle = from + " " + "-" + " " + to;
toolbar.setTitle(toolbarTitle);
}
@Override
public void onFailure(Call<SearchResultsResponse> call, Throwable t) {
Log.d("Error", "" + t.getMessage());
}
});
}
这是回复：（已编辑）
package com.android.vyshnav.indianrailwaysimpledesign.modelSearchTrain;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Generated;
import io.realm.RealmList;
import io.realm.RealmObject;
import io.realm.annotations.PrimaryKey;
@Generated("org.jsonschema2pojo")
public class SearchResultsResponse extends RealmObject{
@PrimaryKey
private String key;
private int total;
private String error;
private RealmList<Train> train = new RealmList<Train>();
private int response_code;
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
/**
*
* @return
* The train
*/
public RealmList<Train> getTrain() {
return train;
}
/**
*
* @param train
* The train
*/
public void setTrain(RealmList<Train> train) {
this.train = train;
}
/**
*
* @return
* The responseCode
*/
public int getResponseCode() {
return response_code;
}
/**
*
* @param responseCode
* The response_code
*/
public void setResponseCode(int responseCode) {
this.response_code = responseCode;
}
/**
*
* @return
* The total
*/
public int getTotal() {
return total;
}
/**
*
* @param total
* The total
*/
public void setTotal(int total) {
this.total = total;
}
/**
*
* @return
* The error
*/
public String getError() {
return error;
}
/**
*
* @param error
* The error
*/
public void setError(String error) {
this.error = error;
}
}
这是Json的回复：
{
"response_code": 200,
"total": 1,
"train": [
{
"no": 1,
"name": "RAPTI SAGAR EXP",
"number": "12511",
"src_departure_time": "06:35",
"dest_arrival_time": "03:50",
"travel_time": "21:15",
"from": {
"name": "GORAKHPUR JN",
"code": "GKP"
},
"to": {
"name": "NAGPUR",
"code": "NGP"
},
"classes": [
{
"class-code": "FC",
"available": "N"
},
{
"class-code": "3E",
"available": "N"
},
{
"class-code": "CC",
"available": "N"
},
{
"class-code": "SL",
"available": "Y"
},
{
"class-code": "2S",
"available": "N"
},
{
"class-code": "2A",
"available": "Y"
},
{
"class-code": "3A",
"available": "Y"
},
{
"class-code": "1A",
"available": "N"
}
],
"days": [
{
"day-code": "MON",
"runs": "N"
},
{
"day-code": "TUE",
"runs": "N"
},
{
"day-code": "WED",
"runs": "N"
},
{
"day-code": "THU",
"runs": "Y"
},
{
"day-code": "FRI",
"runs": "Y"
},
{
"day-code": "SAT",
"runs": "N"
},
{
"day-code": "SUN",
"runs": "Y"
}
]
}
]
}
答案 0 :(得分：0)
您正在获得重复，因为SearchResultsResponse没有主键。
基于您正在使用的API
{
"response_code": 200,
"error": "",
"position": "Train has reached Destination and late by 5 minutes.",
"train_number": "12046",
"route": [
{
"no": 1,
"station_": {
"name": "CHANDIGARH",
"code": "CDG"
},
"has_arrived": false,
"has_departed": true,
"day": 0,
"distance": 0,
"scharr": "Source",
"schdep": "12:00",
"actarr": "00:00",
"actdep": "12:00",
"scharr_date": "19 Nov 2015",
"actarr_date": "19 Nov 2015",
"latemin": 0
},
{
"no": 2,
"station_": {
"name": "AMBALA CANT JN",
"code": "UMB"
},
"has_arrived": true,
"has_departed": true,
"day": 0,
"distance": 67,
"scharr": "12:40",
"schdep": "12:42",
"actarr": "12:40",
"actdep": "12:42",
"scharr_date": "19 Nov 2015",
"actarr_date": "19 Nov 2015",
"latemin": 0
},
{
"no": 3,
"station_": {
"name": "NEW DELHI",
"code": "NDLS"
},
"has_arrived": true,
"has_departed": false,
"day": 0,
"distance": 265,
"scharr": "15:25",
"schdep": "Destination",
"actarr": "15:30",
"actdep": "00:00",
"scharr_date": "19 Nov 2015",
"actarr_date": "19 Nov 2015",
"latemin": 5
}
]
}
对我而言，您似乎应构建以下RealmObject：
public class TrainRoute extends RealmObject {
@PrimaryKey
private String key; // train_number + station_code + scharr_date + scharr
private long trainNumber;
private int no;
private String stationName;
private String stationCode;
private boolean hasArrived;
private boolean hasDeparted;
private int day;
private int distance;
private String scharr;
private String schdep;
private String actarr;
private String actdep;
private String scharrDateText;
private String actarrDateText;
private Date scharrDate;
private Date actarrDate;
private int latemin;
// getter setter
}
之后，您的主键应该具体且相同，并且不应相互覆盖。