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Cannot retrieve field values from realm object, values are null in debugger
(5 answers)
Closed 5 years ago.
I need to do a simple query in Realm, retrieve a list of MyModel object and later use it somewhere else in my app. It happens that once I query Realm, each object has null values, but the toString returns the expected values.
Model:
#RealmClass
public class MyModel extends RealmObject implements Serializable {
public static final String KEY_MODEL = "key_myModel";
#PrimaryKey
private int id;
private String myStr;
private int myInt;
//.... getters and setters
#Override
public String toString() {
return "id = " + id
+ "\nmyStr = " + myStr
+ "\nmyInt = " + myInt;
}
}
How do I store the value:
public static void storeModel(MyModel model) {
Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
realm.copyToRealm(model);
realm.commitTransaction();
}
How do I retrieve the objects:
public static RealmList<MyModel> getNewElementsFromIndex(int indexFrom) {
Realm realm = Realm.getDefaultInstance();
RealmResults<MyModel> allValues = realm.where(MyModel).greaterThan("id", indexFrom).findAll();
RealmList<MyModel> finalList = new RealmList<MyModel>();
finalList.addAll(allValues.subList(0, allValues.size()));
return finalList;
}
When i call getNewElementsFromIndex(value) i get a list of item, but all items in this list have the parameter myStr = null and myInt = 0.
What am I doing wrong?
For managed realm objects, data is not copied to the fields, you obtain them through the proxy getter/setter calls.
Therefore, the fact that fields are null and toString() shows the values is completely expected and well-documented behavior.
To see the values, you have to add watches for the getter methods.
See the documentation.
I am currently developing an android application for a client who is insisting to use Odoo for API. I don't have any idea about it. I am not getting it even after referring to this link. They provide an URL, Database name, username, and password. If anyone did Odoo with Android before, can you give any suggestions?
There are a lot of ways to connect Android to Odoo. Here they are:
Json-RPC
XML-RPC (especially aXMLRPC, this is what I am using)
There is also a framework called Odoo Mobile Framework . I have tried it but found a lot of issues and I was not able to get it work properly. You can find the documentation here.
Odoo has a Web Service API which is available for Python, Ruby, PHP and Java. I strongly recommend to take a look.
For my case, I have cloned the aXMLRPC git repository, created a package in my project and adapted the original package name. But recently I have found this on Stack Overflow explaining how to add aXMLRPC to your Android project using Gradle (I didn't give it a try yet).
Odoo had made available three endpoints:
xmlrpc/2/db to get the list of available databases on your server, it does not require to be authenticated;
xmlrpc/2/common to log in to the server, it does not require to be authenticated;
xmlrpc/2/object, is used to call methods of odoo models via the execute_kw RPC function.
public class OdooConnect {
String url;
private XMLRPCClient client;
public OdooConnect(String serverAddress, String path) {
url = serverAddress + "/xmlrpc/2/" + path;
client = new XMLRPCClient(url);
}
public Object login(String db, String username, String password) {
Object object;
try {
object = client.call("login", db, username, password);
return object;
} catch (XMLRPCException e) {
e.printStackTrace();
}
return null;
}
public Object checkServer() {
Object object;
try {
object = client.call("list", new Object[]{});
return object;
} catch (XMLRPCException e) {
e.printStackTrace();
}
return null;
}
}
In this class, the constructor as arguments the server address (it can be http(s)://your_ip_address:the_port_number) and the path ('db', 'common' or 'object').
The checkServer method returns an object which is actually an array containing the list of available databases.
The login mehtod returns an Integer which is the Id of the authenticated user.
For the Odoo CRUD mehtods (search_read, search_count, search, write, create, unlink) you can take a look to the Odoo Web Service API Java code matching the method you want.
Here is an example of the search_read method. I assume that you've an XMLRPCClient named client.
public Object search_read(String db, int user_id, String password, String object, List conditions, Map<String, List> fields) {
Object result = null;
try {
result = client.call("execute_kw", db, user_id, password, object, "search_read", conditions, fields);
} catch (XMLRPCException e) {
e.printStackTrace();
}
return result;
}
Where
object is an Odoo model for example "res.partner"
conditions is the domain (filter) something like this: Collections.singletonList(Collections.singletonList(Arrays.asList("supplier", "=", true)));
fields, the fields you want to get,
fields = new HashMap() {{put("fields", Arrays.asList("id","name","is_company","street")); }};
You must cast the result of the method to Object[] which will give you an array containing a list of objects each representing a record.
Object[] objects = (Object[]) result;
if (objects.length > 0) {
for (Object object : objects) {
String name= OdooUtil.getString((Map<String, Object>) object, "name");
boolean is_company= OdooUtil.getBoolean((Map<String, Object>) object, "is_company");
String street = OdooUtil.getString((Map<String, Object>) object, "street");
int id= OdooUtil.getInteger((Map<String, Object>) object, "id");
}
}
Here the OdooUtil class
public class OdooUtil {
public static String getString(Map<String, Object> map, String fieldName) {
String res = "";
if (map.get(fieldName) instanceof String) {
res = (String) map.get(fieldName);
}
return res;
}
public static Integer getInteger(Map<String, Object> map, String fieldName) {
Integer res = 0;
if (map.get(fieldName) instanceof Integer) {
res = (Integer) map.get(fieldName);
}
return res;
}
public static Double getDouble(Map<String, Object> map, String fieldName) {
Double res = 0.0;
if (map.get(fieldName) instanceof Double) {
res = (Double) map.get(fieldName);
}
return res;
}
public static Boolean getBoolean(Map<String, Object> map, String fieldName) {
Boolean res = false;
if (map.get(fieldName) instanceof Boolean) {
res = (Boolean) map.get(fieldName);
}
return res;
}
public static Float getFloat(Map<String, Object> map, String fieldName) {
Float res = 0f;
if (map.get(fieldName) instanceof Float) {
res = (Float) map.get(fieldName);
}
return res;
}
}
If you have a many2one field you only have access to the id and the name of the related record. You can use the following class to get the id and the name of the many2one record.
public class Many2One {
private int id;
private String name;
public Many2One() {
}
public static Many2One getMany2One(Map<String, Object> stringObjectMap, String fieldName) {
Integer fieldId = 0;
String fieldValue = "";
Many2One res = new Many2One();
if (stringObjectMap.get(fieldName) instanceof Object[]) {
Object[] field = (Object[]) stringObjectMap.get(fieldName);
if (field.length > 0) {
fieldId = (Integer) field[0];
fieldValue = (String) field[1];
}
}
res.id = fieldId;
res.name = fieldValue;
return res;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
}
Example of usage of Many2One class
String partner_name= Many2One.getMany2One((Map<String, Object>) object, "partner_id").getName();
int partner_id= Many2One.getMany2One((Map<String, Object>) object, "partner_id").getId();
For other remaining CRUD methods, you can easily find a way how they work by reading the Odoo Web Service API documentation.
I hope this gives you some insights.
This is Just an Example did to access contacts/partners from odoo:
#!/usr/bin/env python
import csv
from xmlrpclib import ServerProxy
SERVER = 'http://localhost:8069'
DATABASE = 'testcompany'
USERNAME = 'admin'
PASSWORD = 'password'
FILE_PATH = 'ODOO_clientsMain2_test.csv'
server = ServerProxy('http://localhost:8069/xmlrpc/common')
user_id = server.login(DATABASE, USERNAME, PASSWORD)
server = ServerProxy('http://localhost:8069/xmlrpc/object')
def search(list, key):
for item in list:
return item[key]
reader = csv.reader(open(FILE_PATH,'rb'))
for row in reader:
#print row
partner_template = {
'name': row[0],
#'company_id': row[1],
}
if row[2] is not None and row[2]<>'':
partner_template.update({'email': row[2]})
if row[5] is not None and row[5]<>'':
partner_template.update({'tin': row[5]})
if row[6] is not None and row[6]<>'':
partner_template.update({'ref': row[6]})
if row[8] is not None and row[8]<>'':
partner_template.update({'phone': row[8]})
if row[9] is not None and row[9]<>'':
partner_template.update({'mobile': row[9]})
print partner_template
partner_id = server.execute_kw(DATABASE, user_id, PASSWORD, 'res.partner', 'create', [partner_template])
#create External ID
external_ids = {
'model': 'res.partner',
'name': row[11],
'res_id': partner_id,
}
external_id = server.execute_kw(DATABASE, user_id, PASSWORD, 'ir.model.data', 'create', [external_ids])
# update related fields
if row[7] is not None and row[7]<>'':
#look up and update payment term
payment_term_id = server.execute_kw(DATABASE, user_id, PASSWORD, 'account.payment.term', 'search_read', [[['name','=',row[7]],['active', '=', True]]],{'fields': ['id'], 'limit': 1})
if payment_term_id is not None:
id = server.execute_kw(DATABASE, user_id, PASSWORD, 'res.partner', 'write', [[partner_id],{'property_payment_term': search(payment_term_id,'id')}])
if row[10] is not None and row[10]<>'':
#look up and update pricelist
pricelist_id = server.execute_kw(DATABASE, user_id, PASSWORD, 'product.pricelist', 'search_read', [[['name','=',row[10]],['active', '=', True]]],{'fields': ['id'], 'limit': 1})
if pricelist_id is not None:
id = server.execute_kw(DATABASE, user_id, PASSWORD, 'res.partner', 'write', [[partner_id],{'property_product_pricelist': search(pricelist_id,'id')}])
If you are creating your application from stretch and only required Android API for Odoo, here is open-source API https://github.com/oogbox/odoo-mobile-api (Odoo android api)
To use in android, first add the following dependency to your app level build.gradle
compile 'com.oogbox.api:odoo:1.0.0'
Documentation: https://github.com/oogbox/odoo-mobile-api#getting-started
Thanks
I have API that returns a list of objects. These objects have relations to another objects. But API returns only IDs for them. In order to get full object I have to use another API. For instance:
class Owner extends RealmObject {
...
RealmList<Cat> cats;
}
class Cat extends RealmObject {
#PrimaryKey
String id;
String name;
}
so when I receive list of Owners I store them in database like this:
for (OwnerDto o : owners) {
Owner owner = new Owner();
...
RealmList<Cat> catsList = new RealmList<>();
for (Cat c : o.cats) {
Cat cat = new Cat();
cat.setId(c.id);
catsList.add(cat);
}
owner.setCats(catsList);
realm.copyToRealmOrUpdate(owner);
}
but in this case all the cats' names are deleted if they were populated before.
Is it possible to create RealmObject with ID only in order to set relation, and fill it with date afterwords ? Or specify relation with Id only ? Or any other solution ?
UPDATE:
I came up with solution like this:
for (OwnerDto o : owners) {
Owner owner = new Owner();
...
RealmList<Cat> catsList = new RealmList<>();
for (Cat c : o.cats) {
Cat cat = realm.where(Cat.class)
.equalsTo("id", c.id)
.findFirst();
if (cat == null) {
cat = new Cat();
}
cat.setId(c.id);
catsList.add(cat);
}
owner.setCats(catsList);
realm.copyToRealmOrUpdate(owner);
}
Here I figured out that there is method realm.objectForPrimaryKey(User.self, key: "key") for swift but I did not fund analog in java version.
It would be nice to have in this situation something like realm.getOrCreate(Cat.class, c.id) method. Is there any ?
It's pretty rough to do that if you don't have the whole objects before you want to link them together, because you can't just store a RealmList<T> of primitives, only RealmList<T extends RealmObject>.
So your options are:
1.) have the cats in your Realm and then download the Owner into which you piece it together with realm queries.
realm.beginTransaction();
Owner owner = new Owner();
owner.setCats(new RealmList<Cat>());
for(int i = 0; i < listOfCats.size(); i++) {
String id = listOfCats.get(i);
Cat cat = realm.where(Cat.class).equalTo("id", id).findFirst();
owner.getCats().add(cat);
}
realm.commitTransaction();
2.) have a RealmList<RealmString> in which you store the IDs.
public class RealmString extends RealmObject {
private String value;
public String getValue() { return value; }
public void getValue(String value) { this.value = value; }
}
You'll probably need to use some ugly queries afterwards.
RealmResults<Owner> ownerOfCat = realm.where(Owner.class)
.equalTo("catIds.value", catId).findAll();
i have a problem getting timestamp(rowversion) from my SQL Azure database.
In my tables there is a column with datatype timestamp. This timestamp isn't similar to datetime, it's more like a rowversion.
I can get all other data in this table with the query from MobileServiceTable, there is no problem.
But this special datatype is a problem.
My class for this table looks like:
public class ArbeitsgangBezeichnung {
#com.google.gson.annotations.SerializedName("id")
private int ID;
#com.google.gson.annotations.SerializedName("ABZ_ArbeitsgangBezeichnungID")
private int ABZ_ArbeitsgangBezeichnungID;
#com.google.gson.annotations.SerializedName("ABZ_Bezeichnung")
private String ABZ_Bezeichnung;
#com.google.gson.annotations.SerializedName("ABZ_RowVersion")
private StringMap<Number> ABZ_RowVersion;
//constructor, getter, setter, etc....
}
If i login in Azure and look at the table, there are my example values and the automatic generated timestamp. The timestamp value looks like "AAAAAAAAB/M=". If i login in sql database and let me show the data, then for timestamp there is only "binarydata" (in pointed brackets) and not that value as it is shown in Azure.
The variable "ABZ_RowVersion" should include this timestamp, but the data in the StringMap doesn't look like the one in Azure. I tried String and Byte as datatype for the StringMap, but it doesn't helped.
I tried byte[] for ABZ_RowVersion, but then i got an exception in the callback method.
Then i tried Object for ABZ_RowVersion, that time i found out, that it is a StringMap, but nothing more.
Does anybody know, how to get the data from timestamp, i need it for comparison.
Thanks already
When you create a timestamp column in a table, it's essentially a varbinary(8) column. In the node SQL driver, it's mapped to a Buffer type (the usual node.js type used for binary data). The object which you see ({"0":0, "1":0, ..., "length":8}) is the way that a buffer is stringified into JSON. That representation doesn't map to the default byte array representation from the Gson serializer in Android (or to the byte[] in the managed code).
To be able to use timestamp columns, the first thing you need to do is to "teach" the serializer how to understand the format of the column returned by the server. You can do that with a JsonDeserializer<byte[]> class:
public class ByteArrayFromNodeBufferGsonSerializer
implements JsonDeserializer<byte[]> {
#Override
public byte[] deserialize(JsonElement element, Type type,
JsonDeserializationContext context) throws JsonParseException {
if (element == null || element.isJsonNull()) {
return null;
} else {
JsonObject jo = element.getAsJsonObject();
int len = jo.get("length").getAsInt();
byte[] result = new byte[len];
for (int i = 0; i < len; i++) {
String key = Integer.toString(i);
result[i] = jo.get(key).getAsByte();
}
return result;
}
}
}
Now you should be able to read data. There's still another problem, though. On insert and update operations, the value of the column is sent by the client, and SQL doesn't let you set them in them. So let's take this class:
public class Test {
#SerializedName("id")
private int mId;
#SerializedName("name")
private String mName;
#SerializedName("version")
private byte[] mVersion;
public int getId() { return mId; }
public void setId(int id) { this.mId = id; }
public String getName() { return mName; }
public void setName(String name) { this.mName = name; }
public byte[] getVersion() { return mVersion; }
public void setVersion(byte[] version) { this.mVersion = version; }
}
On the insert and update operations, the first thing we need to do in the server-side script is to remove that property from the object. And there's another issue: after the insert is done, the runtime doesn't return the rowversion property (i.e., it doesn't update the item variable. So we need to perform a lookup against the DB to retrieve that column as well:
function insert(item, user, request) {
delete item.version;
request.execute({
success: function() {
tables.current.lookup(item.id, {
success: function(inserted) {
request.respond(201, inserted);
}
});
}
});
}
And the same on update:
function update(item, user, request) {
delete item.version;
request.execute({
success: function() {
tables.current.lookup(item.id, {
success: function(updated) {
request.respond(200, updated);
}
});
}
});
}
Now, this definitely is a lot of work - the support for this type of column should be better. I've created a feature request in the UserVoice page at http://mobileservices.uservoice.com/forums/182281-feature-requests/suggestions/4670504-better-support-for-timestamp-columns, so feel free to vote it up to help the team prioritize it.
I use ormlite and I have a db with a field:
public static final String NAME = "name";
#DatabaseField (canBeNull = false, dataType = DataType.SERIALIZABLE, columnName = NAME)
private String[] name = new String[2];
And I would like to get all elements that name[0] and name[1] are "car". I try to add a where clausule like:
NAMEDB nameDB = null;
Dao<NAMEDB, Integer> daoName = this.getHelper().getDao(NAMEDB.class);
QueryBuilder<NAMEDB, Integer> queryName = daoName.queryBuilder();
Where<NAMEDB, Integer> where = queryName.where();
where.in(nameDb.NAME, "car");
But it doesn't work because it's an array string.
I have other fields:
public static final String MARK = "mark";
#DatabaseField (canBeNull = false, foreign = true, index = true, columnName = MARK)
private String mark = null;
And I can do this:
whereArticulo.in(nameDB.MARK, "aaa");
How can I solve my problem? Thanks.
It seems to me that a third option to store a string array (String[] someStringArray[]) in the database using Ormlite would be to define a data persister class that converts the string array to a single delimited string upon storage into the database and back again to a string array after taking it out of the database.
E.g., persister class would convert ["John Doe", "Joe Smith"] to "John Doe | Joe Smith" for database storage (using whatever delimiter character makes sense for your data) and converts back the other way when taking the data out of the database.
Any thoughts on this approach versus using Serializable or a foreign collection? Anyone tried this?
I just wrote my first persister class and it was pretty easy. I haven't been able to identify through web search or StackOverflow search that anyone has tried this.
Thanks.
As ronbo4610 suggested, it is a good idea to use a custom data persister in this case, to store the array as a string in the database separated by some kind of delimiter. You can then search the string in your WHERE clause just as you would any other string. (For example, using the LIKE operator)
I have implemented such a data persister. In order to use it, you must add the following annotation above your String[] object in your persisted class:
#DatabaseField(persisterClass = ArrayPersister.class)
In addition, you must create a new class called "ArrayPersister" with the following code:
import com.j256.ormlite.field.FieldType;
import com.j256.ormlite.field.SqlType;
import com.j256.ormlite.field.types.StringType;
import org.apache.commons.lang3.StringUtils;
public class ArrayPersister extends StringType {
private static final String delimiter = ",";
private static final ArrayPersister singleTon = new ArrayPersister();
private ArrayPersister() {
super(SqlType.STRING, new Class<?>[]{ String[].class });
}
public static ArrayPersister getSingleton() {
return singleTon;
}
#Override
public Object javaToSqlArg(FieldType fieldType, Object javaObject) {
String[] array = (String[]) javaObject;
if (array == null) {
return null;
}
else {
return StringUtils.join(array, delimiter);
}
}
#Override
public Object sqlArgToJava(FieldType fieldType, Object sqlArg, int columnPos) {
String string = (String)sqlArg;
if (string == null) {
return null;
}
else {
return string.split(delimiter);
}
}
}
Unfortunately ORMLite does not support querying fields that are the type SERIALIZABLE. It is storing the array as a serialized byte[] so you cannot query against the values with an IN query like:
where.in(nameDb.NAME, "car");
ORMLite does support foreign collections but you have to set it up yourself with another class holding the names. See the documentation with sample code:
http://ormlite.com/docs/foreign-collection