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So I can add and delete Mongo documents but I ran into trouble with updates using HTTPPut.
When I get the record from the controller, the ObjectId in Angular is sort of truncated down to the string. When I pass it back to the controller, the controller complains that it's not a valid MongoDB ObjectID and HTTP 400 me. The response was not a valid ObjectID.
I tried changing my angular model Id to object
public Id: string --- Before
public Id: object --- After
Took the BSON decorators out of the .Net Model, which is the MongoDB model
[BsonId]
[BsonRepresentation(BsonType.ObjectId)]
public ObjectId Id { get; set; }
Not really sure what direction to go here to keep my mean stack.
HtTP Response
HTTP/1.1 400 Bad Request
Transfer-Encoding: chunked
Content-Type: application/json; charset=utf-8
Vary: Origin
Server: Kestrel
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: <a href="https://localhost:44367">https:
X-Frame-Options: DENY
X-SourceFiles: =?UTF-8?B?RzpcamtpcmtlcnhBbmd1bGFyXGFwaVxwb3J0Zm9saW9zXFVwZGF0ZVBvcnRmb2xpb1w1YmFkNTEyMGM0MzFjYjA1NjQxNTE2NTk=?=
X-Powered-By: ASP.NET
Date: Thu, 27 Sep 2018 23:09:47 GMT
7f
{"Id":["Error converting value \"5bad5120c431cb0564151659\" to type 'MongoDB.Bson.ObjectId'. Path 'Id', line 1, position 32."]}
0
If it ain't broke don't fix it
Discover my world at jkirkerx.com
modified 27-Sep-18 19:11pm.
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It looks like a fairly standard serialization error. I don't think you need the BsonRepresentationAttribute here.
Have you had a look at the docs:
Mapping Classes
The default for Id mapping is the string type, but you can use ObjectId as you are, but you need to set a specific IdGenerator.
Going through the references for the various IdGenerators in the MongoDB.Bson.Serialization.IdGenerators namespace, it looks like there are 3 candidate generators for ObjectId. I don't know which one is more appropriate for your use case, but if I were to venture a guess the general ObjectIdGenerator should be appropriate:
MongoDB.Bson.Serialization.IdGenerators Namespace
So, your mapping ultimately should look like:
[BsonId(IdGenerator = typeof(ObjectIdGenerator)]
public ObjectId Id { get; set; }
"Never attribute to malice that which can be explained by stupidity."
- Hanlon's Razor
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I thought about it last night and decided to just remove that column and not use the BSON Object ID, but to use the string version of the Object ID instead. This might get me later on when I find out that I need that Object for something, not sure what yet, To lookup the server that wrote the record or the other data stored in the ObjectId.
After testing just now, I can finally reach the .Net Controller for Update without my posted error.
Well basically my mean stack now works for updates using HTTPPUT. First time so I'm excited because it completed my stack operations.
But I'll go ahead and investigate and try that type and see what happens.
I thought maybe I needed to decorate the controller action with something that would regenerate the ObjectId back to the proper format.
Thanks for helping me!
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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Do I really need to store that Object ID in it's natural format?
Or is it possible to just store the string, and then convert it back to it's natural format using something on the .Net Core side if I need it? Maybe on the Angular side there is something to convert it with as well?
My mean stack fully works now, guess I'll try your research and see what happens. If it works I'll store the Object.
This is how my Mongo record looks now.
{
"_id" : "5bae68208301500628d80f8c",
"TimeStamp" : ISODate("2018-09-28T17:42:57.068Z"),
"Name" : "Long Beach Grand Prix 2008",
"Description" : "I took this photo at the Long Beach Grand Prix",
"CreatedBy" : "admin",
"HTML" : "",
"AvatarB64" : "data:image/jpeg;base64, data string.
"AvatarName" : "5bae68208301500628d80f8c.jpg",
"AvatarType" : "image/jpeg",
"AvatarUrl" : "<a href="https://localhost:44367/content/images/avatars/portfolios/5bae68208301500628d80f8c.jpg">https:
"AvatarX" : 256,
"AvatarY" : 256,
"AvatarStatus" : true
}
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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I've always just modeled it as a string when I've needed to. I assumed you were going for the C# Mongo ObjectId for your own reasons :p
Keep in mind, this isn't about how you're storing it, but rather just how you're referencing it after deserialization.
"Never attribute to malice that which can be explained by stupidity."
- Hanlon's Razor
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nah, just no clue and part of the learning process.
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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jkirkerx wrote: ObjectId....HTTP...application/json
You have an object.
You are attempting to serialize it to json for use in an http request. I suspect you might want deserialize at some point as well.
So you need a json serializer/deserializer. Just as you would for any object.
It probably already is doing that but what you are getting is the complex form (the Mongodb form fully blown out) and what you actually want is the stringified version of that id. So you need a custom serializer/deserializer.
You should already have an http layer is some form so you just need to add that in there.
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I saw some examples of serializing and deserializing the ObjectId. But wanted to see some progress or get my mean stack working first.
In the database I stored the #C .Net ObjectId, but say on a Http Get request Angular got it as a simple string. Send it from Angular back to the controller with a Put or Post sent the string, but the controller was looking for the ObjectId.
I get it now, since I took the ObjectId out of the model and can Get, Post, Put, Delete now.
I'll take your thoughts and research more on it, do some test.
Overall:
This Portfolio module I just wrote in Angular 6 TypeScript is pretty slick. Drag and Drop, Select image button and extract it as a base64 string and update the thumbnail preview. You can change the image as many times as you want, I don't care. Then submit and fire off the model to the controller, controller processes the image, even flips it around if it's from an iPhone, write it's to disk, creates a MongoDB document, then updates the model and sends it back to Angular and updates the page. I just need a pretty progress icon now.
I wrote very few lines of code, mostly worked on keeping really small and compact and tons of research and experimenting.
730 lines. I should measure the image data and store it in the database to detect image updates, and then fire off the graphics mode.
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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Run this application correctly from vb.net code
when build this application and compile Exe file
Run Exe file error display:
Cannot open database "COLORS". User login failed for user "Administrator"
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But my problem not solve "OriginalGriff"
he said talk to database administrator
therefor i message you. Who is solve my problem.
This is database issue you can check this.
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Computechsoft wrote: This is database issue you can check this.
Have you talked to your Database administrator? Have you checked that you are using the correct username and password for the database? These are not things that we can check for you.
I notice that you also posted the same problem at https://www.codeproject.com/Questions/1261063/Run-time-from-VB-NET-no-error[^], so it is clear that you are asking the wrong people.
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This is connectionString (username and password) it is correct.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="RMS.My.MySettings.StupConnection" connectionString="Data Source=System-PC\SQLEXPRESS;Initial Catalog=Master;User ID=Administrator;Password=Admin" />
</connectionStrings>
</configuration>
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"Cannot open database "COLORS". User login failed for user "Administrator""
This message is telling you that the login detail are incorrect. As stated a number of times already, we cannot help with this. You need to check the settings in your database system.
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Which was itself a repost of: Run time from VB.NET (no error)[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Try to connect your database using DB with same login. If you're getting the same error message, it's clear that you're fighting with wrong login info. So just confirm with your DB Team/administrator regarding the login info. First ensure that you're able to database using DBTool(Ex: SQL or Oracle) & then try your code.
Agree with Richard. Don't post same (duplicate) questions in multiple forums. Just wait for sometime to get more answers from more volunteers.
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I Developed the program that retrieve the content from Database and store it in the List
List<Student> studentList=session.createQuery("from Student s where s.lastName=:lastName and s.firstName=:firstName")
.setString("lastName",lname)
.setString("firstName",fname).list();
for(Student studentinfo:studentList)
{
System.out.println(studentinfo);
}
model.addAttribute("result",studentList);
And i have passed the result to the JSP File
${result}
<c:forEach var="item" items="${result}">
${item}
</c:forEach>
I am getting the result like this
"Student{id=6, firstName='arul', lastName='suju', address='s;lda'}"
But i want print the value one by one,Can any one suggest better code in JSP
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I store a secret as byte[] in MongoDB, and went to decrypt and it failed.
so In my .Net class I used byte[].
"Secret" : { "$binary" : "o2lBkODfRqw=", "$type" : "00" },
What would be the correct way?
string? to Base64 and back
on a side note, I used Bson Date format to store a date, but in TypeScript can't pull the time offset from it.
Should I just dump the Bson decorator and just use Date?
Or just test and see if it works.
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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My Bad, I can store a byte[] in MongoDB.
I had changed the secret by mistake on login.
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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Glad you got it sorted. How's Mongo been treating you?
"Never attribute to malice that which can be explained by stupidity."
- Hanlon's Razor
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So far so good. I really like it.
Finally got use to the ObjectId and my models are matching up in .Net Core and Angular. The Net Core Mongo drivers are pretty cool, but a whole different beast. MongoDB is fine for my portfolio website and a good learning experience.
Got praise last night at the Agile meetup for taking the time to learn it. So it be a valuable tool or experience.
I’m in Vegas for the weekend, won $50 so far.
If it ain't broke don't fix it
Discover my world at jkirkerx.com
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Hi,
I have a SQL Server database with some views. If I wanted to create a new view based on a current view what is the process please? Is their issues with interrogating the same table from two views?
Thanks in advance
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Treat the view as just another table, you can have multiple joins to the same table/view in any view.
Where there may be an issue is when you self reference via a chain of joins but MSSQL will tell you when you try and run the query.
Never underestimate the power of human stupidity
RAH
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Dear All,
rs3=st.executeQuery("select * from "+sdata[j]+" where Username='"+idata[i]+"'");
while(rs3.next())
{
%><td><%out.println(rs3.getString("Final_Grade"));%></td><%
}
In the above JSP Code,sdata[j] is the array of table names and idata[i] is the array of usernames. what i am trying to achieve is, to retrieve final_grade from the tables sdata[j] with the username==idata[i] . Since the username is existing in some table it displays the final grade, but when no record found in the table i want print it as "Null" instead of Final_Grade . Is this possible to implement?
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