C# EF Random Order causes related list disappear
I got a Problem with my API. I want to get a random amout of questions back.
The Model of my question has a list of answers and hints:
public class Question
{
public int Id { get; set; }
public string Text { get; set; }
public string Explanation { get; set; }
public Category Category { get; set; }
public ICollection<Answer> Answers { get; set; }
public ICollection<Hint> Hints { get; set; }
}
normally if i call my get method i get a json with all the lists back
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList();
{
"id": 1,
"text": "Test?",
"explanation": "Test",
"category": null,
"answers": [
{
"id": 1,
"text": "Test",
"isCorrect": true
},
{
"id": 2,
"text": "Test1",
"isCorrect": false
},
{
"id": 3,
"text": "Test2",
"isCorrect": false
},
{
"id": 4,
"text": "Test3",
"isCorrect": false
}
],
"hints": [
{
"id": 1,
"text": "..."
},
{
"id": 2,
"text": "..."
}
]
}
But if I want to get random picks with a orderby i only got empty lists
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
{
"id": 1,
"text": "test",
"explanation": "..-",
"category": null,
"answers": ,
"hints":
}
Does someone have a Idea to fix this?
c# entity-framework repository
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
add a comment |
I got a Problem with my API. I want to get a random amout of questions back.
The Model of my question has a list of answers and hints:
public class Question
{
public int Id { get; set; }
public string Text { get; set; }
public string Explanation { get; set; }
public Category Category { get; set; }
public ICollection<Answer> Answers { get; set; }
public ICollection<Hint> Hints { get; set; }
}
normally if i call my get method i get a json with all the lists back
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList();
{
"id": 1,
"text": "Test?",
"explanation": "Test",
"category": null,
"answers": [
{
"id": 1,
"text": "Test",
"isCorrect": true
},
{
"id": 2,
"text": "Test1",
"isCorrect": false
},
{
"id": 3,
"text": "Test2",
"isCorrect": false
},
{
"id": 4,
"text": "Test3",
"isCorrect": false
}
],
"hints": [
{
"id": 1,
"text": "..."
},
{
"id": 2,
"text": "..."
}
]
}
But if I want to get random picks with a orderby i only got empty lists
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
{
"id": 1,
"text": "test",
"explanation": "..-",
"category": null,
"answers": ,
"hints":
}
Does someone have a Idea to fix this?
c# entity-framework repository
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
According to this answer, you should be using a Fisher-Yates Shuffle algorithm.
– ikerbera
Nov 23 '18 at 11:06
add a comment |
I got a Problem with my API. I want to get a random amout of questions back.
The Model of my question has a list of answers and hints:
public class Question
{
public int Id { get; set; }
public string Text { get; set; }
public string Explanation { get; set; }
public Category Category { get; set; }
public ICollection<Answer> Answers { get; set; }
public ICollection<Hint> Hints { get; set; }
}
normally if i call my get method i get a json with all the lists back
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList();
{
"id": 1,
"text": "Test?",
"explanation": "Test",
"category": null,
"answers": [
{
"id": 1,
"text": "Test",
"isCorrect": true
},
{
"id": 2,
"text": "Test1",
"isCorrect": false
},
{
"id": 3,
"text": "Test2",
"isCorrect": false
},
{
"id": 4,
"text": "Test3",
"isCorrect": false
}
],
"hints": [
{
"id": 1,
"text": "..."
},
{
"id": 2,
"text": "..."
}
]
}
But if I want to get random picks with a orderby i only got empty lists
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
{
"id": 1,
"text": "test",
"explanation": "..-",
"category": null,
"answers": ,
"hints":
}
Does someone have a Idea to fix this?
c# entity-framework repository
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
I got a Problem with my API. I want to get a random amout of questions back.
The Model of my question has a list of answers and hints:
public class Question
{
public int Id { get; set; }
public string Text { get; set; }
public string Explanation { get; set; }
public Category Category { get; set; }
public ICollection<Answer> Answers { get; set; }
public ICollection<Hint> Hints { get; set; }
}
normally if i call my get method i get a json with all the lists back
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList();
{
"id": 1,
"text": "Test?",
"explanation": "Test",
"category": null,
"answers": [
{
"id": 1,
"text": "Test",
"isCorrect": true
},
{
"id": 2,
"text": "Test1",
"isCorrect": false
},
{
"id": 3,
"text": "Test2",
"isCorrect": false
},
{
"id": 4,
"text": "Test3",
"isCorrect": false
}
],
"hints": [
{
"id": 1,
"text": "..."
},
{
"id": 2,
"text": "..."
}
]
}
But if I want to get random picks with a orderby i only got empty lists
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
{
"id": 1,
"text": "test",
"explanation": "..-",
"category": null,
"answers": ,
"hints":
}
Does someone have a Idea to fix this?
c# entity-framework repository
c# entity-framework repository
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
edited Nov 23 '18 at 11:20
user3559349
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
asked Nov 23 '18 at 10:54
MiroBehnMiroBehn
33
33
According to this answer, you should be using a Fisher-Yates Shuffle algorithm.
– ikerbera
Nov 23 '18 at 11:06
add a comment |
According to this answer, you should be using a Fisher-Yates Shuffle algorithm.
– ikerbera
Nov 23 '18 at 11:06
According to this answer, you should be using a Fisher-Yates Shuffle algorithm.
– ikerbera
Nov 23 '18 at 11:06
According to this answer, you should be using a Fisher-Yates Shuffle algorithm.
– ikerbera
Nov 23 '18 at 11:06
add a comment |
1 Answer
1
active
oldest
votes
After sql need to be a list. I got a similar problem a long time ago.
Hope it s help, was with an older version of Ef.
So you have to add a ToList before the OrderBy.
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList().OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Take out the.ToList()in the middle.
– Neil
Nov 23 '18 at 11:56
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
After sql need to be a list. I got a similar problem a long time ago.
Hope it s help, was with an older version of Ef.
So you have to add a ToList before the OrderBy.
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList().OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Take out the.ToList()in the middle.
– Neil
Nov 23 '18 at 11:56
add a comment |
After sql need to be a list. I got a similar problem a long time ago.
Hope it s help, was with an older version of Ef.
So you have to add a ToList before the OrderBy.
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList().OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Take out the.ToList()in the middle.
– Neil
Nov 23 '18 at 11:56
add a comment |
After sql need to be a list. I got a similar problem a long time ago.
Hope it s help, was with an older version of Ef.
So you have to add a ToList before the OrderBy.
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList().OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
After sql need to be a list. I got a similar problem a long time ago.
Hope it s help, was with an older version of Ef.
So you have to add a ToList before the OrderBy.
return _ctx.Questions.Include(x => x.Answers).Include(x => x.Hints).ToList().OrderBy(o => Guid.NewGuid()).Take(amount).ToList();
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
answered Nov 23 '18 at 11:06
LeBigCatLeBigCat
2087
2087
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Take out the.ToList()in the middle.
– Neil
Nov 23 '18 at 11:56
add a comment |
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Take out the.ToList()in the middle.
– Neil
Nov 23 '18 at 11:56
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Worked! Thank you!
– MiroBehn
Nov 23 '18 at 11:10
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Works, but loads the whole table (along with the related data) in memory.
– Ivan Stoev
Nov 23 '18 at 11:55
Take out the
.ToList() in the middle.– Neil
Nov 23 '18 at 11:56
Take out the
.ToList() in the middle.– Neil
Nov 23 '18 at 11:56
add a comment |
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According to this answer, you should be using a Fisher-Yates Shuffle algorithm.
– ikerbera
Nov 23 '18 at 11:06