Using the example code from the Unity Developer Guide | Parse
# https://www.parse.com/docs/unity_guide#objects-updating
// Create the object.
var gameScore = new ParseObject("GameScore")
{
{ "score", 1337 },
{ "playerName", "Sean Plott" },
{ "cheatMode", false },
{ "skills", new List<string> { "pwnage", "flying" } },
};
gameScore.SaveAsync().ContinueWith(t =>
{
// Now let's update it with some new data. In this case, only cheatMode
// and score will get sent to the cloud. playerName hasn't changed.
gameScore["cheatMode"] = true;
It just adds a new row and leaves the original row unchanged.
I guess i'm thinking Parse would do something "SQL like" such as UPDATE where primaryKey = 123.
Searching for an answer i found this code #
https://parse.com/questions/updating-a-field-without-retrieving-the-object-first, but there was no example in C#. All attempts to port this to C# result in multiple syntax errors.
UnityScript:
// Create a pointer to an object of class Point with id dlkj83d
var Point = Parse.Object.extend("Point");
var point = new Point();
point.id = "dlkj83d";
// Set a new value on quantity
point.set("quantity", 6);
// Save
point.save(null, {
success: function(point) {
// Saved successfully.
},
error: function(point, error) {
// The save failed.
// error is a Parse.Error with an error code and description.
}
});
Does Parse have some way to update a row that already exists using C#? And where is it in the docs? And how can their own example be so useless?
One of the posts related to my question stated "retrieve the object, then write it back with the changes" and i had not the faintest idea how to execute the stated objective (especially after the epic fail of Parse Documentation's example code)
Here is what i have been able to figure out and make work:
var query = new ParseQuery<ParseObject>("Tokens")
.WhereEqualTo ("objectId", "XC18riofu9");
query.FindAsync().ContinueWith(t =>
{
var tokens = t.Result;
IEnumerator<ParseObject> enumerator = tokens.GetEnumerator();
enumerator.MoveNext();
var token = enumerator.Current;
token["power"] = 20;
return token.SaveAsync();
}).Unwrap().ContinueWith(t =>
{
// Everything is done!
//Debug.Log("Token has been updated!");
});
the first part retrieves the object with the stated objectId, the second part sets the fields in the object. The third part reports all is well with the operation.
it's a monkey see, monkey do understanding at this point being that i do not understand the finer points in the code.
the code can be tested by creating a class named "Tokens". in that class create a tokenName field and a power field. make a few rows with Fire, water, mud as the tokenNames. Replace the objectId in the .WhereEqualTo clause with a valid objectId or any other search parameters you like. Execute the code and observe the changes in the Parse Data Browser.
For extra credit create the class required to implement the example code from the Chaining Tasks Together section of Parse's Documentation.
https://www.parse.com/docs/unity_guide#tasks-chaining
Related
I'm trying to replicate results from Gensim in C# to compare results and see if we need to bother trying to get Python to work within our broader C# context. I have been programming in C# for about a week, am usually a Python coder. I managed to get LDA to function and assign topics with C#, but there is no Catalyst model (that I could find) that does Doc2Vec explicitly, but rather I need to do something with FastText as they have in their sample code:
// Training a new FastText word2vec embedding model is as simple as this:
var nlp = await Pipeline.ForAsync(Language.English);
var ft = new FastText(Language.English, 0, "wiki-word2vec");
ft.Data.Type = FastText.ModelType.CBow;
ft.Data.Loss = FastText.LossType.NegativeSampling;
ft.Train(nlp.Process(GetDocs()));
ft.StoreAsync();
The claim is that it is simple, and fair enough... but what do I do with this? I am using my own data, a list of IDocuments, each with a label attached:
using (var csv = CsvDataReader.Create("Jira_Export_Combined.csv", new CsvDataReaderOptions
{
BufferSize = 0x20000
}))
{
while (await csv.ReadAsync())
{
var a = csv.GetString(1); // issue key
var b = csv.GetString(14); // the actual bug
// if (jira_base.Keys.ToList().Contains(a) == false)
if (jira.Keys.ToList().Contains(a) == false)
{ // not already in our dictionary... too many repeats
if (b.Contains("{panel"))
{
// get just the details/desc/etc
b = b.Substring(b.IndexOf("}") + 1, b.Length - b.IndexOf("}") - 1);
try { b = b.Substring(0, b.IndexOf("{panel}")); }
catch { }
}
b = b.Replace("\r\n", "");
jira.Add(a, nlp.ProcessSingle(new Document(b,Language.English)));
} // end if
} // end while loop
From a set of Jira Tasks and then I add labels:
foreach (KeyValuePair<string, IDocument> item in jira) { jira[item.Key].Labels.Add(item.Key); }
Then I add to a list (based on a breakdown from a topic model where I assign all docs that are at or above a threshold in that topic to the topic, jira_topics[n] where n is the topic numner, as such:
var training_lst = new List<IDocument>();
foreach (var doc in jira_topics[topic_num]) { training_lst.Add(jira[doc]); }
When I run the following code:
// FastText....
var ft = new FastText(Language.English, 0, $"vector-model-topic_{topic_num}");
ft.Data.Type = FastText.ModelType.Skipgram;
ft.Data.Loss = FastText.LossType.NegativeSampling;
ft.Train(training_lst);
var wtf = ft.PredictMax(training_lst[0]);
wtf is (null,NaN). [hence the name]
What am I missing? What else do I need to do to get Catalyst to vectorize my data? I want to grab the cosine similarities between the jira tasks and some other data I have, but I can't even get the Jira data into anything resembling a vectorization I can apply to something. Help!
Update:
So, Predict methods apparently only work for supervised learning in FastText (see comments below). And the following:
var wtf = ft.CompareDocuments(training_lst[0], training_lst[0]);
Throws an Implementation error (and only doesn't work with PVDM). How do I use PVDM, PVDCbow in Catalyst?
I just want to check if my RepoItemInfo object (which is username Joe McAdam btw) is equal to string data.
I just tracked this element in Chrome, stored it in my repository and it is a span with #innertext="JoeMcAdam"
Then I made code module for mapping these objects in C# code:
public RepoItemInfo LeftNameRepoItem {get {return _pageHome.Home.ImeLijevoInfo; }}
And I have prepared data Name in my context file for this LeftName to check if they are equal:
void ITestModule.Run()
{
var dto = new LoginDto () {
Name = "Joe McAdam",
WaitTimeLimit = 20000,
};
LoginDtoContext.template = dto;
}
I just need a proper code example for checking if they are eqal. What should I do? Do I have to make some adapter for this RepoItemInfo to convert it in string, text or something else?
I hope I provided enough details about my problem.
Thanks in advance!
I have a Mongo database with lots of documents. All of the documents have a field called "source" which contains the origin name for the document. But a lot of old documents have this field containing "null" (because I hadn't have source by that time) string value. I want to select all those documents and fix this problem by replacing their "source = "null"" values by new values parsed from another fields of the aforementioned documents.
Here's what I'm doing to fix the this:
public void FixAllSources() {
Task.Run(async ()=> {
var filter = Builders<BsonDocument>.Filter.And(new List<FilterDefinition<BsonDocument>>() {
Builders<BsonDocument>.Filter.Exists("url"),
Builders<BsonDocument>.Filter.Ne("url", BsonNull.Value),
Builders<BsonDocument>.Filter.Eq("source", "null")
});
var result = await m_NewsCollection.FindAsync(filter);
var list = result.ToList();
list.ForEach(bson => {
bson["source"] = Utils.ConvertUrlToSource(bson["url"].AsString);
});
});
}
as you can see, I'm fetching all those documents and replacing their source field by a new value. So now I've got a List of correct BsonDocuments which I need to put back into the database.
Unfortunately, I'm stuck on this. The problem is that all of the "Update" methods require filters and I have no idea what filters should I pass there. I just need to put back all those updated documents, and that's it.
I'd appreciate any help :)
p.s.
I've came up with an ugly solution like this:
list.ForEach(bson => {
bson["source"] = Utils.ConvertUrlToSource(bson["url"].AsString);
try {
m_NewsCollection.UpdateOne( new BsonDocument("unixtime", bson["unixtime"]), new BsonDocument {{"$set", bson}},
new UpdateOptions {IsUpsert = true});
}
catch (Exception e) {
WriteLine(e.StackTrace);
}
});
It works for now. But I'd still like to know the better one in case I need to do something like this again. So I'm not putting my own solution as an answer
We are using Neo4j Community 3.2.2 with Neo4jClient 2.0.0.9 and try to create a node if it does not exist. This is covered in the cypher examples and questions like this here on SO, so we thought that should be pretty straight forward:
public class KlientNode
{
[JsonProperty(PropertyName = "id")]
public Guid Id { get; set; }
}
and:
var neuerKlient = new KlientNode { Id = ev.KlientId };
var kq = graphClient.Cypher
.Merge("(klient:Klient { id: {klientId} })")
.OnCreate()
.Set("klient = {neuerKlient}").WithParams(new
{
klientId = neuerKlient.Id,
neuerKlient
});
Console.WriteLine(kq.Query.DebugQueryText);
kq.ExecuteWithoutResults();
So we basically copied the example 1:1.
Unfortunately, this leads to the following output and exception:
MERGE (klient:Klient { id: "80248429-ea80-4a5d-8d4e-88dc1499ea8a" })
ON CREATE
SET klient = {
"id": "80248429-ea80-4a5d-8d4e-88dc1499ea8a"
}
Neo4jClient.NeoException: SyntaxError: Invalid input 'N': expected 'p/P' (line 5, column 2 (offset: 250))
"ON CREATE"
^
The cause seem to be the quotes around the "id" in the SET klient = ... query. If I paste the generated query to the neo4j web console, it shows a syntax error, and if I remove the quotation marks, the query runs just fine.
Anyone has an idea what might be causing the broken query when we just seem to copy the examples almost verbatim?
FWIW, I'm not sure why that happened, but we were able to solve it as follows:
var kq = graphClient.Cypher
.Merge($"(klient:{NodeName} {{ id: {{klientId}} }})")
.OnCreate()
.Set("klient = {neuerKlient}").WithParams(new
{
klientId = ev.KlientId,
neuerKlient = new KlientNode
{
Id = ev.KlientId,
},
});
Console.WriteLine(kq.Query.DebugQueryText);
kq.ExecuteWithoutResults();
The debug output is still the same (ignore the different random Guid):
MERGE (klient:Klient { id: "87798b47-ab1b-49b7-9c5e-018cd244465e" })
ON CREATE
SET klient = {
"id": "87798b47-ab1b-49b7-9c5e-018cd244465e"
}
and the query is still broken if I try to paste it into the neo4j web frontend:
However, the query now executes without an exception.
Since the only change is the shorthand definition of the neuerKlient property in the anonymous object, I assume there is some behaviour internally that was causing the error (even though the debug query output was the same).
I am trying to update a row in a (typed) MongoDB collection with the C# driver. When handling data of that particular collection of type MongoCollection<User>, I tend to avoid retrieving sensitive data from the collection (salt, password hash, etc.)
Now I am trying to update a User instance. However, I never actually retrieved sensitive data in the first place, so I guess this data would be default(byte[]) in the retrieved model instance (as far as I can tell) before I apply modifications and submit the new data to the collection.
Maybe I am overseeing something trivial in the MongoDB C# driver how I can use MongoCollection<T>.Save(T item) without updating specific properties such as User.PasswordHash or User.PasswordSalt? Should I retrieve the full record first, update "safe" properties there, and write it back? Or is there a fancy option to exclude certain fields from the update?
Thanks in advance
Save(someValue) is for the case where you want the resulting record to be or become the full object (someValue) you passed in.
You can use
var query = Query.EQ("_id","123");
var sortBy = SortBy.Null;
var update = Update.Inc("LoginCount",1).Set("LastLogin",DateTime.UtcNow); // some update, you can chain a series of update commands here
MongoCollection<User>.FindAndModify(query,sortby,update);
method.
Using FindAndModify you can specify exactly which fields in an existing record to change and leave the rest alone.
You can see an example here.
The only thing you need from the existing record would be its _id, the 2 secret fields need not be loaded or ever mapped back into your POCO object.
It´s possible to add more criterias in the Where-statement. Like this:
var db = ReferenceTreeDb.Database;
var packageCol = db.GetCollection<Package>("dotnetpackage");
var filter = Builders<Package>.Filter.Where(_ => _.packageName == packageItem.PackageName.ToLower() && _.isLatestVersion);
var update = Builders<Package>.Update.Set(_ => _.isLatestVersion, false);
var options = new FindOneAndUpdateOptions<Package>();
packageCol.FindOneAndUpdate(filter, update, options);
Had the same problem and since I wanted to have 1 generic method for all types and didn't want to create my own implementation using Reflection, I end up with the following generic solution (simplified to show all in one method):
Task<bool> Update(string Id, T item)
{
var serializerSettings = new JsonSerializerSettings()
{
NullValueHandling = NullValueHandling.Ignore,
DefaultValueHandling = DefaultValueHandling.Ignore
};
var bson = new BsonDocument() { { "$set", BsonDocument.Parse(JsonConvert.SerializeObject(item, serializerSettings)) } };
await database.GetCollection<T>(collectionName).UpdateOneAsync(Builders<T>.Filter.Eq("Id", Id), bson);
}
Notes:
Make sure all fields that must not update are set to default value.
If you need to set field to default value, you need to either use DefaultValueHandling.Include, or write custom method for that update
When performance matters, write custom update methods using Builders<T>.Update
P.S.: It's obviously should have been implemented by MongoDB .Net Driver, however I couldn't find it anywhere in the docs, maybe I just looked the wrong way.
Well there are many ways to updated value in mongodb.
Below is one of the simplest way I choose to update a field value in mongodb collection.
public string UpdateData()
{
string data = string.Empty;
string param= "{$set: { name:'Developerrr New' } }";
string filter= "{ 'name' : 'Developerrr '}";
try
{
//******get connections values from web.config file*****
var connectionString = ConfigurationManager.AppSettings["connectionString"];
var databseName = ConfigurationManager.AppSettings["database"];
var tableName = ConfigurationManager.AppSettings["table"];
//******Connect to mongodb**********
var client = new MongoClient(connectionString);
var dataBases = client.GetDatabase(databseName);
var dataCollection = dataBases.GetCollection<BsonDocument>(tableName);
//****** convert filter and updating value to BsonDocument*******
BsonDocument filterDoc = BsonDocument.Parse(filter);
BsonDocument document = BsonDocument.Parse(param);
//********Update value using UpdateOne method*****
dataCollection.UpdateOne(filterDoc, document);
data = "Success";
}
catch (Exception err)
{
data = "Failed - " + err;
}
return data;
}
Hoping this will help you :)