I have the next mongo document structure :
_id
-countryCode
-keywordID
-name
-displayName
-categories:[Array]
-_id
-name
-position
-canonical
I would like to get all the keywords that are in a specific category only knowing the category's ID. I am using the mongo C# driver but don't know how could I check what's inside that array.
I would like to send a list with the category ID's and get back all the keywords that have a category from that list.
public async Task<List<Keyword>> GetKeywords(List<long> keywordCatIds, string countryCode)
{
var mongoCollection = MongoDatabase.GetCollection<Keyword>("Keywords");
try
{
FilterDefinition<Keyword> mongoFilter = Builders<Keyword>.Filter.In(c=>c.Categories, keywordCatIds);
return await mongoCollection.Find(mongoFilter,null).ToListAsync<Keyword>();
}
catch (Exception ex)
{
Logger.Error(ex, "Multiple ids for Country Code: {0}, ids: {1}", countryCode, string.Join(',', keywordCatIds.Select(s => s)));
return null;
}
}
Your In function looks like a "categories._id" filter in normal mongoDB. Which transitions into an ElemMatch. I created a project which fills the db, than selects
all the keywords that are in a specific category only knowing the category's ID
public class CustomID
{
public string CountryCode { get; set; }
public long KeywordId { get; set; }
public string Name { get; set; }
}
public class Keyword
{
[BsonId]
public CustomID Id { get; set; }
public List<Category> Categories { get; set; }
}
public class Category
{
[BsonId]
public long Id { get; set; }
public string Name { get; set; }
public int Position { get; set; }
}
internal class Program
{
public static IMongoDatabase MongoDatabase { get; private set; }
public static async Task Main()
{
var conventionPack = new ConventionPack
{
new CamelCaseElementNameConvention()
};
ConventionRegistry.Register(
"CustomConventionPack",
conventionPack,
t => true);
var client = new MongoClient();
MongoDatabase = client.GetDatabase("SO");
var ret = await GetKeywords(new List<long> {1L, 2L}, "HU-hu");
// ret is A and B. C is filtered out because no category id of 1L or 2L, D is not HU-hu
}
public static async Task<List<Keyword>> GetKeywords(List<long> keywordCatIds, string countryCode)
{
var mongoCollection = MongoDatabase.GetCollection<Keyword>("keywords");
// be ware! removes all elements. For debug purposes uncomment>
//await mongoCollection.DeleteManyAsync(FilterDefinition<Keyword>.Empty);
await mongoCollection.InsertManyAsync(new[]
{
new Keyword
{
Categories = new List<Category>
{
new Category {Id = 1L, Name = "CatA", Position = 1},
new Category {Id = 3L, Name = "CatC", Position = 3}
},
Id = new CustomID
{
CountryCode = "HU-hu",
KeywordId = 1,
Name = "A"
}
},
new Keyword
{
Categories = new List<Category>
{
new Category {Id = 2L, Name = "CatB", Position = 2}
},
Id = new CustomID
{
CountryCode = "HU-hu",
KeywordId = 2,
Name = "B"
}
},
new Keyword
{
Categories = new List<Category>
{
new Category {Id = 3L, Name = "CatB", Position = 2}
},
Id = new CustomID
{
CountryCode = "HU-hu",
KeywordId = 3,
Name = "C"
}
},
new Keyword
{
Categories = new List<Category>
{
new Category {Id = 1L, Name = "CatA", Position = 1}
},
Id = new CustomID
{
CountryCode = "EN-en",
KeywordId = 1,
Name = "EN-A"
}
}
});
var keywordFilter = Builders<Keyword>.Filter;
var categoryFilter = Builders<Category>.Filter;
var mongoFilter =
keywordFilter.ElemMatch(k => k.Categories, categoryFilter.In(c => c.Id, keywordCatIds)) &
keywordFilter.Eq(k => k.Id.CountryCode, countryCode);
return await mongoCollection.Find(mongoFilter).ToListAsync();
}
}
Related
I am having problem adding to the model. I want to have a list in the Root1 or in the Viewmodel like fullname and authors list.
newModel1
AuthorsAccepted count=4
FullName = Jack
AuthorsAccepted count=4
FullName = Time Dean
With the code below it only adds the last one to the Root1. I created a a third model. Is there a way I can add to the third model both the lists or in Root1.
var fullName = "Jack";
var fullName2 = "Tim Dean";
var authors1 = new List<AuthorsAccepted1>() {
new AuthorsAccepted1(){ id = 1, Name="Bill"},
new AuthorsAccepted1(){ id = 2, Name="Steve"},
new AuthorsAccepted1(){ id = 3, Name="jon"},
new AuthorsAccepted1(){ id = 4, Name="nick"}
};
var authors2 = new List<AuthorsAccepted1>() {
new AuthorsAccepted1(){ id = 1, Name="jack"},
new AuthorsAccepted1(){ id = 2, Name="tim"},
new AuthorsAccepted1(){ id = 3, Name="james"},
new AuthorsAccepted1(){ id = 4, Name="mary"}
};
var newModel1 = new Root1();
newModel1.FullName = fullName;
newModel1.AuthorsAccepted = authors1;
var newModel2 = new Root1();
newModel2.FullName = fullName2;
newModel2.AuthorsAccepted = authors2;
}
}
public class Root1
{
public string FullName { get; set; }
public List<AuthorsAccepted1> AuthorsAccepted { get; set; }
}
public class AuthorsAccepted1
{
public string Name { get; set; }
public int id { get; set; }
}
public class Viewmodel
{
public Root1 AllModel { get; set; }
}
I'm getting the results of a sql outer join as flat results in an IEnumerable, and would like to convert them to nested typed objects in linq. From something like this:
[{id: 1, industryId: 1}, {id:1, industryId: 2}, {id:2, industryId: 1} etc..]
to something like this:
list of Company [{id: 1, list of Industry{industryId: 1, 2}, {id: 2, list of Industry{industryId: 1}}]
I'm currently trying a solution with GroupBy:
Companies = flatDbRows
.GroupBy(
row => row.CompanyId,
(key, value) => new CompanyModel
{
CompanyId = value.First().CompanyId,
CompanyName = value.First().CompanyName,
Industries = value
.GroupBy(
row => new { row.IndustryId, row.Industry },
(k, v) => new IndustryModel() { IndustryId = k.IndustryId, Name = k.Industry }
)
.Where(x => x.IndustryId != 0)
.ToList(),
}).ToList();
}
but it doesn't feel great, especially with all the value.First() I'm using to get the values that only belong to each grouped company. Is there something more appropriate? Group join sounded more like what I wanted, but I'm having trouble understanding how to apply it to a single list. I'm open to using query syntax instead of the lambdas if that's easier.
I'm trying to go from this model (where company-related info will be duplicated for each outer joined industry result):
public class CompanyFlatDbRowsModel
{
public int CompanyId { get; set; }
public string CompanyName { get; set; }
public int IndustryId{ get; set; }
public string Industry { get; set; }
}
to this:
public class CompanyModel
{
public int CompanyId { get; set; }
public string CompanyName { get; set; }
public IEnumerable<IndustryModel> Industries { get; set; }
}
// FULL edit after providing your models
public class TestClass
{
public class CompanyModel
{
public int CompanyId { get; set; }
public string CompanyName { get; set; }
public List<IndustryModel> Industires { get; set; }
}
public class IndustryModel
{
public int IndustryId { get; set; }
public string IndustryName { get; set; }
}
public class CompanyFlatDbRowsModel
{
public CompanyFlatDbRowsModel()
{
}
public int CompanyId { get; set; }
public string CompanyName { get; set; }
public int IndustryId { get; set; }
public string Industry { get; set; }
}
[Fact]
public void Test()
{
var data = new List<CompanyFlatDbRowsModel>
{
new CompanyFlatDbRowsModel
{
CompanyId = 1,
CompanyName = "Company 1",
IndustryId = 1,
Industry = "Industry 1"
},
new CompanyFlatDbRowsModel
{
CompanyId = 1,
CompanyName = "Company 1",
IndustryId = 2,
Industry = "Industry 2"
},
new CompanyFlatDbRowsModel
{
CompanyId = 2,
CompanyName = "Company 2",
IndustryId = 3,
Industry = "Industry 3"
},
new CompanyFlatDbRowsModel
{
CompanyId = 2,
CompanyName = "Company 2",
IndustryId = 4,
Industry = "Industry 4"
},
};
var result = data.GroupBy(x => x.CompanyId)
.Select(x => new CompanyModel()
{
CompanyId = x.Key,
CompanyName = x.First().CompanyName,
Industires = x.Select(y=> new IndustryModel
{
IndustryName = y.Industry,
IndustryId = y.IndustryId
}).ToList()
}).ToList();
foreach (var item in result)
{
var text = $"Company id : {item.CompanyId}, industries : {string.Join(',',item.Industires.Select(x=>$"(name: {x.IndustryName}, id: {x.IndustryId})"))}";
Debug.WriteLine(text);
}
}
}
output:
Company id : 1, industries : (name: Industry 1, id: 1),(name: Industry 2, id: 2)
Company id : 2, industries : (name: Industry 3, id: 3),(name: Industry 4, id: 4)
edit:
alternatively you can do as below, however the "first" thing still occurs somewhere, I have tried also the GroupJoin but it doesn't really help in that case.
var otherResult = data.Select(x =>
new CompanyModel
{
CompanyId = x.CompanyId,
CompanyName = x.CompanyName,
Industires = data
.Where(y => y.CompanyId == x.CompanyId)
.Select(y => new IndustryModel
{
IndustryId = y.IndustryId,
IndustryName = y.Industry
}).ToList()
})
.GroupBy(y => y.CompanyId)
.Select(x => x.First())
.ToList();
edit:
one more approach without using "first"
var anotherResult = data.GroupBy(x => x.CompanyId)
.Select(x =>
{
var companyModel = new CompanyModel()
{
CompanyId = x.Key
};
companyModel.Industires = x.Select(y =>
{
companyModel.CompanyName = y.CompanyName; // assignign here occurs multiple times however with the same value
return new IndustryModel
{
IndustryId = y.IndustryId,
IndustryName = y.Industry
};
}).ToList();
return companyModel;
}).ToList();
Hi I am trying to learn how to create Web ASP.NET applications and I'm stuck on trying to get to this result.
{
"memberNumber":"1234567890",
"forename":"Fred",
"surname":"Smith",
"products":[
{
"name":"Health Ins",
"cost":100
},
{
"name":"Travel Ins",
"cost":150
}
]
}
I cannot figure out how to add different product name/cost for each individual member. I can display the memberNumber/forename/surname but get an error when I add the products.add line to the members.add line.
Here is my member model:
public class Member
{
public int memberNumber { get; set; } = 0;
public string forename { get; set; } = "";
public string surname { get; set; } = "";
public List<Products> products { get; set; }
}
public class Products
{
public string name { get; set; } = "";
public int cost { get; set; } = 0;
}
Here is my controller:
public class MembersController : ApiController
{
List<Member> members = new List<Member>();
List<Products> products = new List<Products>();
public MembersController()
{
members.Add(new Member { memberNumber = 1234567890, forename = "Fred", surname = "Smith"});
members.Add(new Member { memberNumber = 1, forename = "Big", surname = "Ben"});
members.Add(new Member { memberNumber = 2, forename = "Jack", surname = "Ryan" });
products.Add(new Products { name = "Health Ins", cost = 100 });
products.Add(new Products { name = "Travel Ins", cost = 150 });
}
// GET: api/Members
public List<Member> Get()
{
return members;
}
// GET: api/Members/5
public Member Get(int id)
{
return members.Where(x => x.memberNumber == id).FirstOrDefault();
}
}
Did not include the Post/Put/Delete RESTful services.
products.Add(new Products { name = "Health Ins", cost = 100 });
products.Add(new Products { name = "Travel Ins", cost = 150 });
will add those data in
List<Products> products = new List<Products>();
instead of your expectations in Member class.
I think you might want to add products collection in a member instead of another List
You can use Auto-Property Initializers to init products List collection in Member class.
public class Member
{
public int memberNumber { get; set; } = 0;
public string forename { get; set; } = "";
public string surname { get; set; } = "";
public List<Products> products { get; set; } = new List<Products>();
}
the MembersController constructed data will be like this.
public class MembersController : ApiController
{
List<Member> members = new List<Member>();
public MembersController()
{
var member1 = new Member { memberNumber = 1234567890, forename = "Fred", surname = "Smith"};
var member2 = new Member { memberNumber = 1, forename = "Big", surname = "Ben"};
var member3 = new Member { memberNumber = 2, forename = "Jack", surname = "Ryan" };
member1.products.Add(new Products { name = "Health Ins", cost = 100 });
member1.products.Add(new Products { name = "Travel Ins", cost = 150 });
members.Add(member1);
members.Add(member2);
members.Add(member3);
}
// GET: api/Members
public List<Member> Get()
{
return members;
}
// GET: api/Members/5
public Member Get(int id)
{
return members.Where(x => x.memberNumber == id).FirstOrDefault();
}
}
You're pretty much there, but you will need to assign a product list for each member like this:
List<Products> p= new List<Products>();
p.Add(new Products { name = "Health Ins", cost = 100 });
p.Add(new Products { name = "Travel Ins", cost = 150 });
members.Add(new Member { memberNumber = 1234567890, forename = "Fred", surname = "Smith", Products =p});
// Second member
p= new List<Products>();
p.Add(new Products { name = "Big Bens products", cost = 222});
members.Add(new Member { memberNumber = 1, forename = "Big", surname = "Ben", Products =p});
Thus you can add as many members containing as many products you wish. Please note that we're not talking about ArrayLists but about Lists. ArrayLists have been deprecated a long time ago.
I'm having an Model Class, I need to Save it in a MongoDB Collection.
My Model Class:
public Class Employee
{
public string EmpID { get; set; }
public string EmpName { get; set; }
public List<Mobile> EmpMobile { get; set; }
}
public Class Mobile
{
public string MobID { get; set; }
public string MobNumber { get; set; }
public bool IsPreferred { get; set; }
}
The Values are
Employee EmpInfo = new Employee()
{
EmpID = "100",
EmpName = "John",
EmpMobile = new List<Mobile>()
{
{ MobNumber = "55566610", IsPreferred = true },
{ MobNumber = "55566611", IsPreferred = false },
}
}
BsonDocument _employee = new BsonDocument()
{
{ "Emp_ID", EmpInfo.EmpID },
{ "Emp_Name", EmpInfo.EmpName },
{ "Emp_Mobile", new BsonArray (EmpInfo.EmpMobile.Select(m => new
{
MobID = new ObjectId(),
MobNumber = m.MobNumber,
IsPreferred = m.IsPreferred
})) }
};
var collection = _database.GetCollection<BsonDocument>("EmployeeInfo");
collection.InsertOne(_employee);
I wish to save the above EmpInfo of type Employee in a MongoDB. But I can't able to create a BsonDocument. Kindly assist me is there is anything wrong in the above code. If yes kindly assist me.
there is no need to serialize to bson document
You can use TYPED collection and just insert data
Please see attached code snipet with updated class structure
void Main()
{
// To directly connect to a single MongoDB server
// or use a connection string
var client = new MongoClient("mongodb://localhost:27017");
var database = client.GetDatabase("test");
var collectionEmpInfo = database.GetCollection<Employee>("Employee");
Employee EmpInfo = new Employee
{
EmpID = "100",
EmpName = "John",
EmpMobile = new List<Mobile>
{
new Mobile{ MobNumber = "55566610", IsPreferred = true, MobID = ObjectId.GenerateNewId() },
new Mobile{ MobNumber = "55566611", IsPreferred = false, MobID = ObjectId.GenerateNewId() },
}
};
collectionEmpInfo.InsertOne(EmpInfo);
var empList = collectionEmpInfo.Find(new BsonDocument()).ToList();
empList.Dump(); //dump is used in linqPad
}
public class Employee
{
public ObjectId Id { get; set; }
public string EmpID { get; set; }
public string EmpName { get; set; }
public List<Mobile> EmpMobile { get; set; }
}
public class Mobile
{
public ObjectId MobID { get; set; }
public string MobNumber { get; set; }
public bool IsPreferred { get; set; }
}
In addition to answer above, I can suggest following code if you want to deal directly with Bson for some reason:
BsonDocument _employee = new BsonDocument()
{
{ "Emp_ID", EmpInfo.EmpID },
{ "Emp_Name", EmpInfo.EmpName },
{ "Emp_Mobile", BsonArray.Create(EmpInfo.EmpMobile.Select(m => new BsonDocument()
{
{ "MobID" , new ObjectId() },
{ "MobNumber", m.MobNumber },
{ "IsPreferred", m.IsPreferred }
})) }
};
The reason of the error you've got is that BsonArray.Create creates an array of values, not an array of objects. See this question for details.
I have a Linq question: (DotNet Framework 4.0)
I have the following classes:
public class Employee
{
public Guid? EmployeeUUID { get; set; }
public string SSN { get; set; }
}
public class JobTitle
{
public Guid? JobTitleSurrogateKey { get; set; }
public string JobTitleName { get; set; }
}
public class EmployeeToJobTitleMatchLink
{
public EmployeeToJobTitleMatchLink()
{
this.TheJobTitle = new JobTitle() { JobTitleSurrogateKey = Guid.NewGuid(), JobTitleName = "SomeJobTitle:" + Guid.NewGuid().ToString("N") };
}
public Guid LinkSurrogateKey { get; set; }
/* Related Objects */
public Employee TheEmployee { get; set; }
public JobTitle TheJobTitle { get; set; }
}
public class Organization
{
public Organization()
{
this.Links = new List<EmployeeToJobTitleMatchLink>();
}
public int OrganizationSurrogateKey { get; set; }
public ICollection<EmployeeToJobTitleMatchLink> Links { get; set; }
}
In my code below, I can compare 2 child-collections and get the results I need (in "matches1".
Here I am using the "SSN" string property to compare and find the overlaps. And the Console.Write for matches1 works as I expect.
What I don't know how to do is compare the first child collection (org10) to all the children in (allOtherOrgsExceptOrg10 (all the Organizations and all the Links of these Organizations )
The commented out code shows kinda what I'm trying to do, one of my many feeble attempts today.
But basically, match2 would be populated with all the SSN overlaps...but comparing org10 with allOtherOrgsExceptOrg10, all their "Links", and their Employee.SSN's.
org10 overlaps with org20 with "AAA", so match2 would contain "AAA". and org10 overlaps with org30 with "BBB" so match2 would contain "BBB".
Organization org10 = new Organization();
org10.OrganizationSurrogateKey = 10;
Employee e11 = new Employee() { SSN = "AAA", EmployeeUUID = new Guid("AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA") };
EmployeeToJobTitleMatchLink link11 = new EmployeeToJobTitleMatchLink();
link11.TheEmployee = e11;
org10.Links.Add(link11);
Employee e12 = new Employee() { SSN = "BBB", EmployeeUUID = new Guid("BBBBBBBB-BBBB-BBBB-BBBB-BBBBBBBBBBBB") };
EmployeeToJobTitleMatchLink link12 = new EmployeeToJobTitleMatchLink();
link12.TheEmployee = e12;
org10.Links.Add(link12);
Organization org20 = new Organization();
org20.OrganizationSurrogateKey = 20;
Employee e21 = new Employee() { SSN = "AAA", EmployeeUUID = new Guid("AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA") };
EmployeeToJobTitleMatchLink link21 = new EmployeeToJobTitleMatchLink();
link21.TheEmployee = e21;
org20.Links.Add(link21);
Employee e22 = new Employee() { SSN = "CCC", EmployeeUUID = new Guid("CCCCCCCC-CCCC-CCCC-CCCC-CCCCCCCCCCCC") };
EmployeeToJobTitleMatchLink link22 = new EmployeeToJobTitleMatchLink();
link22.TheEmployee = e22;
org20.Links.Add(link22);
Organization org30 = new Organization();
org30.OrganizationSurrogateKey = 30;
Employee e31 = new Employee() { SSN = "BBB", EmployeeUUID = new Guid("BBBBBBBB-BBBB-BBBB-BBBB-BBBBBBBBBBBB") };
EmployeeToJobTitleMatchLink link31 = new EmployeeToJobTitleMatchLink();
link31.TheEmployee = e31;
org30.Links.Add(link31);
Employee e32 = new Employee();
e32.SSN = "ZZZ";
EmployeeToJobTitleMatchLink link32 = new EmployeeToJobTitleMatchLink();
link32.TheEmployee = e32;
org30.Links.Add(link32);
IList<Organization> allOtherOrgsExceptOrg10 = new List<Organization>();
/* Note, I did not add org10 here */
allOtherOrgsExceptOrg10.Add(org20);
allOtherOrgsExceptOrg10.Add(org30);
IEnumerable<EmployeeToJobTitleMatchLink> matches1 =
org10.Links.Where(org10Link => org20.Links.Any(org20Link => org20Link.TheEmployee.SSN.Equals(org10Link.TheEmployee.SSN, StringComparison.OrdinalIgnoreCase)));
IEnumerable<EmployeeToJobTitleMatchLink> matches2 = null;
//org10.Links.Where(org10Link => ( allOtherOrgs.Where ( anyOtherOrg => anyOtherOrg.Links.Any(dbSideChild => dbSideChild.TheEmployee.SSN == org10Link.TheEmployee.SSN)) );
if (null != matches1)
{
foreach (EmployeeToJobTitleMatchLink link in matches1)
{
Console.WriteLine(string.Format("matches1, SSN = {0}", link.TheEmployee.SSN));
}
}
if (null != matches2)
{
foreach (EmployeeToJobTitleMatchLink link in matches2)
{
Console.WriteLine(string.Format("matches2, SSN = {0}", link.TheEmployee.SSN));
}
}
matches2 =
allOtherOrgsExceptOrg10.SelectMany(x => x.Links)
.Where(x => org10.Links.Select(o => o.TheEmployee.SSN).Contains(x.TheEmployee.SSN));
You can use the SelectMany on the allOther collection to select all Links over all org's. Then check if any SSN is inside the org10 List.
See: http://msdn.microsoft.com/en-us/library/system.linq.enumerable.selectmany(v=vs.100).aspx
You can use SelectMany to flatten out the collection and then use it just like you have for matches1
IEnumerable<EmployeeToJobTitleMatchLink> matches2 =
org10.Links.Where(
org10Link =>
allOtherOrgsExceptOrg10.SelectMany(allOtherOrgs => allOtherOrgs.Links).Any(
anyOtherLink =>
anyOtherLink.TheEmployee.SSN.Equals(org10Link.TheEmployee.SSN, StringComparison.OrdinalIgnoreCase)));
The SelectMany will make it seem like one IEnumerable instead of and IEnumerable of an IEnumerable.