Develop Reference

C# Bad Performance OData when using extension

I have a Web API for OData services. I have a lot of table with many relations. Here is some of the table:
MSADDRESSCOUNTRY
public partial class MSADDRESSCOUNTRY
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage","CA2214:DoNotCallOverridableMethodsInConstructors")]
public MSADDRESSCOUNTRY()
{
this.MSADDRESSPROVINCEs = new HashSet<MSADDRESSPROVINCE>();
}
public int ID { get; set; }
public string CODE { get; set; }
public string COUNTRYNAME { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage","CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<MSADDRESSPROVINCE> MSADDRESSPROVINCEs { get; set; }
}
MSADDRESSPROVINCE
public partial class MSADDRESSPROVINCE
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public MSADDRESSPROVINCE()
{
this.MSADDRESSDISTRICTs = new HashSet<MSADDRESSDISTRICT>();
}
public int ID { get; set; }
public Nullable<int> COUNTRYID { get; set; }
public string PROVINCENAME { get; set; }
public virtual MSADDRESSCOUNTRY MSADDRESSCOUNTRY { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage","CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<MSADDRESSDISTRICT> MSADDRESSDISTRICTs { get; set; }
}
MSADDRESSDISTRICT
public partial class MSADDRESSDISTRICT
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public MSADDRESSDISTRICT()
{
this.MSADDRESSSUBDISTRICTs = new HashSet<MSADDRESSSUBDISTRICT>();
}
public int ID { get; set; }
public Nullable<int> PROVINCEID { get; set; }
public string DISTRICTNAME { get; set; }
public virtual MSADDRESSPROVINCE MSADDRESSPROVINCE { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<MSADDRESSSUBDISTRICT> MSADDRESSSUBDISTRICTs { get; set; }
}
I create DTO object model for every table with the property is the same with Database object model.
I want the client can use $expand keyword to get child data and/or parent data.
For MSADDRESSCOUNTRY I need to write the code like this.
[EnableQuery(MaxExpansionDepth = 4)]
public IQueryable<MsAddressCountryObject> Get()
{
return db.MSADDRESSCOUNTRies.Select(c => new MsAddressCountryObject
{
ID = c.ID,
CODE = c.CODE,
COUNTRYNAME = c.COUNTRYNAME,
MSADDRESSPROVINCEs = c.MSADDRESSPROVINCEs.Select(data => new MsAddressProvinceObject()
{
ID = data.ID,
COUNTRYID = data.COUNTRYID,
PROVINCENAME = data.PROVINCENAME,
MSADDRESSCOUNTRY = new MsAddressCountryObject()
{
ID = data.MSADDRESSCOUNTRY.ID,
CODE = data.MSADDRESSCOUNTRY.CODE,
COUNTRYNAME = data.MSADDRESSCOUNTRY.COUNTRYNAME,
},
MSADDRESSDISTRICTs = data.MSADDRESSDISTRICTs.Select(dist => new MsAddressDistrictObject()
{
ID = dist.ID,
PROVINCEID = dist.PROVINCEID,
DISTRICTNAME = dist.DISTRICTNAME,
})
})
});
}
For MSADDRESSPROVINCE I need to write the code like this.
[EnableQuery(MaxExpansionDepth = 4)]
public IQueryable<MsAddressProvinceObject> Get()
{
return db.MSADDRESSPROVINCEs.Select(data => new MsAddressProvinceObject()
{
ID = data.ID,
COUNTRYID = data.COUNTRYID,
PROVINCENAME = data.PROVINCENAME,
MSADDRESSCOUNTRY = new MsAddressCountryObject()
{
ID = data.MSADDRESSCOUNTRY.ID,
CODE = data.MSADDRESSCOUNTRY.CODE,
COUNTRYNAME = data.MSADDRESSCOUNTRY.COUNTRYNAME,
},
MSADDRESSDISTRICTs = data.MSADDRESSDISTRICTs.Select(dist => new MsAddressDistrictObject()
{
ID = dist.ID,
PROVINCEID = dist.PROVINCEID,
DISTRICTNAME = dist.DISTRICTNAME
})
});
}
That code works fast. But if I add/change/remove column, I have to modify the controller manually, one by one for all controller. For example, if I want to add geological coordinate in MSADDRESSDISTRICT, I have to change the code in Country Controller, Province Controller and District Controller.
So I decide to create extension method like this.
public static MsAddressCountryObject ToDTO(this MSADDRESSCOUNTRY data)
{
return new MsAddressCountryObject()
{
ID = data.ID,
CODE = data.CODE,
COUNTRYNAME = data.COUNTRYNAME,
};
}
public static IQueryable<MsAddressCountryObject ToDTO(this IEnumerable<MSADDRESSCOUNTRY datas)
{
return datas.Select(country =
{
var obj = country?.ToDTO();
obj.MSADDRESSPROVINCEs = country.MSADDRESSPROVINCEs?.ToDTO();
return obj;
}).AsQueryable();
}
public static MsAddressProvinceObject ToDTO(this MSADDRESSPROVINCE data)
{
return new MsAddressProvinceObject()
{
ID = data.ID,
COUNTRYID = data.COUNTRYID,
PROVINCENAME = data.PROVINCENAME,
MSADDRESSCOUNTRY = data.MSADDRESSCOUNTRY?.ToDTO()
};
}
public static IQueryable<MsAddressProvinceObject ToDTO(this IEnumerable<MSADDRESSPROVINCE datas)
{
return datas.Select(province =
{
var obj = province?.ToDTO();
obj.MSADDRESSDISTRICTs = province.MSADDRESSDISTRICTs.ToDTO();
return obj;
}).AsQueryable();
}
public static MsAddressDistrictObject ToDTO(this MSADDRESSDISTRICT data)
{
return new MsAddressDistrictObject()
{
ID = data.ID,
PROVINCEID = data.PROVINCEID,
DISTRICTNAME = data.DISTRICTNAME,
MSADDRESSPROVINCE = data.MSADDRESSPROVINCE?.ToDTO()
};
}
public static IQueryable<MsAddressDistrictObject ToDTO(this IEnumerable<MSADDRESSDISTRICT datas)
{
return datas.Select(district =
{
var obj = district?.ToDTO();
obj.MSADDRESSSUBDISTRICTs = district.MSADDRESSSUBDISTRICTs?.ToDTO();
return obj;
}).AsQueryable();
}
And the controller just like this.
[EnableQuery(MaxExpansionDepth = 4)]
public IQueryable<MsAddressCountryObject Get()
{
return db.MSADDRESSCOUNTRies.ToDTO()
}
And that makes the performance really bad. I think the extension is making a lot of memory allocation or some thing that make the result not being delivered directly to the client.
My goal is to create the code easy to maintain, and the performance not drop significantly.
I have many relation in other table. I want the $expand works without write all parent/child Select statement manually and one by one.
I have try to not calling ToDTO() from all the extension method. The result is the performance is fast. But I lost all the relation or I need to write the parent/child Select statement for all method.
Any suggestion will help.
Thanks.

Order List<object> Based on Child Properties [duplicate]

This question already has answers here:
How to Sort a List<T> by a property in the object
(23 answers)
Closed 4 years ago.
I have the following classes.
public class Response
{
List<Make> Makes { get; set; }
public Response()
{
this.Makes = new List<Make>();
}
}
public class Make
{
public string Name { get; set; }
public List<Agent> Agents { get; set; }
public Make()
{
this.Agents = new List<Agent>();
}
}
public class Agent
{
public int Id { get; set; }
public string Name { get; set; }
public List<Offer> Offers { get; set; }
public Agent()
{
this.Offers = new List<Offer>();
}
}
public class Offer
{
public int Id { get; set; }
public List<Model> Models { get; set; }
public Offer()
{
this.Models = new List<Model>();
}
}
public class Model
{
public string Name { get; set; }
public Price Price { get; set; }
public Model()
{
this.Price = new Price();
}
}
public class Price
{
public decimal Total { get; set; }
public decimal Vat { get; set; }
}
Using linq how can I get a list of Makes, that are ordered by the cheapest model first. Also, I want the models for each agent to be ordered by the cheapest first.

The easy way is to put the data into a flat object like a datatable and then sort :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace ConsoleApplication98
{
class Program
{
static void Main(string[] args)
{
Response response = new Response() {
Makes = new List<Make>() {
new Make() {
Name = "AAA", Agents = new List<Agent>() {
new Agent() {
Id = 123, Name = "SSS", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
},
new Agent() {
Id = 456, Name = "SST", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
}
}
},
new Make() {
Name = "AAB", Agents = new List<Agent>() {
new Agent() {
Id = 123, Name = "SSS", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
},
new Agent() {
Id = 456, Name = "SST", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
}
}
}
}
};
DataTable dt = new DataTable();
dt.Columns.Add("Make Name", typeof(string));
dt.Columns.Add("Agent ID", typeof(int));
dt.Columns.Add("Agent Name", typeof(string));
dt.Columns.Add("Offer ID", typeof(int));
dt.Columns.Add("Model Name", typeof(string));
dt.Columns.Add("Total", typeof(decimal));
dt.Columns.Add("Vat", typeof(decimal));
foreach (Make make in response.Makes)
{
string makeName = make.Name;
foreach (Agent agent in make.Agents)
{
int agentID = agent.Id;
string agentName = agent.Name;
foreach (Offer offer in agent.Offers)
{
int offerID = offer.Id;
foreach (Model model in offer.Models)
{
string modelName = model.Name;
decimal vat = model.Price.Vat;
decimal total = model.Price.Total;
dt.Rows.Add(new object[] {
makeName,
agentID,
agentName,
offerID,
modelName,
vat,
total
});
}
}
}
}
dt = dt.AsEnumerable().OrderBy(x => x.Field<decimal>("Total")).CopyToDataTable();
}
}
public class Response
{
public List<Make> Makes { get; set; }
public Response()
{
this.Makes = new List<Make>();
}
}
public class Make
{
public string Name { get; set; }
public List<Agent> Agents { get; set; }
public Make()
{
this.Agents = new List<Agent>();
}
}
public class Agent
{
public int Id { get; set; }
public string Name { get; set; }
public List<Offer> Offers { get; set; }
public Agent()
{
this.Offers = new List<Offer>();
}
}
public class Offer
{
public int Id { get; set; }
public List<Model> Models { get; set; }
public Offer()
{
this.Models = new List<Model>();
}
}
public class Model
{
public string Name { get; set; }
public Price Price { get; set; }
public Model()
{
this.Price = new Price();
}
}
public class Price
{
public decimal Total { get; set; }
public decimal Vat { get; set; }
}
}

It would be easier to verify if you'd provided sample values and the desired result, but here's my take on getting the Makes ordered using a LINQ one-liner:
response.Makes.OrderBy(
make => make.Agents.Select(
agent => agent.Offers.Min(
offer => offer.Models.OrderBy(model => model.Price.Total)
.First().Price.Total)));
Here's the flow (the inner bullets enable the outer bullets):
Get list of Makes
For each Make, select list of Agents
For each Agent, select the minimum offer
For each offer, order by the total price
Select the first (lowest) offer
For each Agent, the minimum offer is now selected
The makes can now be ordered by the minimum offer it contains
I'm not absolutely certain that the flow above makes sense, but give the implementation a shot!

Query mongo document array

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();
}
}

Use LINQ to join 2 objects for each of its properties

I have created 2 models to store the results of an sql query. Now I would like to join them for each of the week's... (week1 = Record_id, week2 = Record_id)
to get a new Object in which I would have all the data from the 1st model, as well as map data from the "Category" Model to it.
I created a new Model for it, but I am not sure how to write a linq query
First Model:
public class CustomData
{
public string full_name { get; set; }
public string location { get; set; }
public int week1 { get; set; }
public int week2 { get; set; }
public int week3 { get; set; }
}
Second Model:
public class Category
{
public int Record_ID { get; set; }
public int Color{ get; set; }
public string Name { get; set; }
}
New Model for end result:
public class WeekView
{
public string full_name { get; set; }
public string location { get; set; }
public Category week1 { get; set; }
public Category week2 { get; set; }
public Category week3 { get; set; }
}

This should work:
List<CustomData> list = new List<CustomData>();
list.Add(new CustomData() { full_name = "test", location = "test", week1 = 0, week2 = 1, week3 = 2 });
list.Add(new CustomData() { full_name = "test2", location = "test2", week1 = 0, week2 = 12, week3 = 22 });
List<Category> categories = new List<Category>();
categories.Add(new Category { Color = 0, Name = "testName", Record_ID = 0 });
categories.Add(new Category { Color = 1, Name = "testName1", Record_ID = 1 });
categories.Add(new Category { Color = 2, Name = "testName2", Record_ID = 2 });
categories.Add(new Category { Color = 3, Name = "testName3", Record_ID = 12 });
categories.Add(new Category { Color = 4, Name = "testName4", Record_ID = 22 });
List<WeekView> results = new List<WeekView>();
results.AddRange(list.Select(x=>
new WeekView() { full_name = x.full_name,
location = x.location,
week1 = categories.FirstOrDefault(c => c.Record_ID == x.week1),
week2 = categories.FirstOrDefault(c => c.Record_ID == x.week2),
week3 = categories.FirstOrDefault(c => c.Record_ID == x.week3)
}));

Try out the following:
var result = (from cd in CustomDatas
join ca1 in Categories on cd.week1 equals ca.Record_ID into ca1r
from ca1 in ca1r.DefaultIfEmpty()
join ca2 in Categories on cd.week2 equals ca.Record_ID into ca2r
from ca2 in ca2r.DefaultIfEmpty()
join ca3 in Categories on cd.week3 equals ca.Record_ID into ca3r
from ca3 in ca3r.DefaultIfEmpty()
select new {
full_name = cd.full_name,
location = cd.location,
week1 = ca1,
week2 = ca2,
week3 = ca3
}

Entity Framework Seed method not running

I'm having some trouble getting the Seed method of EF to run. I've run update-database in the PMC - but no effect on the DB. Here's the method:
public class PhilosopherInitialiser : System.Data.Entity.DropCreateDatabaseIfModelChanges<PhilosopherContext>
{
protected override void Seed(PhilosopherContext context)
{
var philosophers = new List<Philosopher>{
new Philosopher {
FirstName = "Bertrand",
LastName = "Russell",
DateOfBirth = DateTime.Parse("1872-05-18"),
DateOfDeath = DateTime.Parse("1970-02-02"),
IsAlive = false,
NationalityID = 1,
AreaID = 7,
Description = "Here's some text about Bertrand Russell"
},
new Philosopher {
FirstName = "Immanuel",
LastName = "Kant",
DateOfBirth = DateTime.Parse("1724-04-22"),
DateOfDeath = DateTime.Parse("1804-02-12"),
IsAlive = false,
NationalityID = 3,
AreaID = 1,
Description = "Here's some text about Immanuel Kant"
},
new Philosopher {
FirstName = "John",
LastName = "Rawls",
DateOfBirth = DateTime.Parse("1921-02-21"),
DateOfDeath = DateTime.Parse("2002-11-24"),
IsAlive = false,
NationalityID = 9,
AreaID = 3,
Description = "Here's some text about John Rawls"
}
};
philosophers.ForEach(p => context.Philosophers.Add(p));
context.SaveChanges();
var nationalities = new List<Nationality>
{
new Nationality { Name = "English" },
new Nationality { Name = "Scotish" },
new Nationality { Name = "German" },
new Nationality { Name = "French" },
new Nationality { Name = "Greek" },
new Nationality { Name = "Italian" },
new Nationality { Name = "Spanish" },
new Nationality { Name = "Russian" },
new Nationality { Name = "American" }
};
nationalities.ForEach(n => context.Nationalities.Add(n));
context.SaveChanges();
var areas = new List<Area>{
new Area { Name = "Metaphysics" },
new Area { Name = "Existentialism" },
new Area { Name = "Political philosophy" },
new Area { Name = "Philosophy of the mind" },
new Area { Name = "Aesthetics" },
new Area { Name = "Social philosophy" },
new Area { Name = "Logic" },
new Area { Name = "Moral philosophy" },
new Area { Name = "Epistemology" }
};
areas.ForEach(a => context.Areas.Add(a));
context.SaveChanges();
var books = new List<Book>
{
new Book {
Title = "The impact of science on society",
PhilosopherID = 1,
AreaID = 6
},
new Book {
Title = "The analysis of mind",
PhilosopherID = 1,
AreaID = 4
},
new Book {
Title = "Marriage and morals",
PhilosopherID = 1,
AreaID = 8
},
new Book{
Title = "Critique of pure reason",
PhilosopherID = 2,
AreaID = 9
},
new Book{
Title = "The metaphysics of morals",
PhilosopherID = 2,
AreaID = 8
},
new Book{
Title = "A theory of justice",
PhilosopherID = 3,
AreaID = 3
}
};
books.ForEach(b => context.Books.Add(b));
context.SaveChanges();
}
}
}
And here's my PhilosopherContext class:
public class PhilosopherContext : DbContext
{
public PhilosopherContext() : base("PhilosopherContext")
{
}
public DbSet<Philosopher> Philosophers { get; set; }
public DbSet<Area> Areas { get; set; }
public DbSet<Nationality> Nationalities { get; set; }
public DbSet<Book> Books { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<Book>()
.HasRequired(p => p.Philosopher)
.WithMany()
.HasForeignKey(p => p.PhilosopherID)
.WillCascadeOnDelete(false);
modelBuilder.Entity<Philosopher>()
.Property(p => p.DateOfBirth)
.HasColumnType("datetime2");
modelBuilder.Entity<Philosopher>()
.Property(p => p.DateOfDeath)
.HasColumnType("datetime2");
}
}
}
Inside the Web.Config file I'm using initialising the DB here:
<contexts>
<context type="PhilosophersLibrary.DAL.PhilosopherContext, PhilosophersLibrary">
<databaseInitializer type="PhilosophersLibrary.DAL.PhilosopherInitialiser, PhilosophersLibrary" />
</context>
</contexts>
Does anyone have any suggestions? I feel that the method might not be called.
UPDATE
I seem to be making progress. The Areas and Nationalities tables are being seeded with the data. But I have to comment out the Philosophers data and the Books data. Is there something wrong with my data model?
public class Book
{
public int BookID { get; set; }
public string Title { get; set; }
[Display(Name = "Philosopher")]
public int PhilosopherID { get; set; }
[Display(Name = "Area")]
public int AreaID { get; set; }
public virtual Philosopher Philosopher { get; set; }
public virtual Area Area { get; set; }
}
public class Philosopher
{
// <className>ID pattern causes property to be primary key
public int PhilosopherID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
[Display(Name = "Date of birth")]
public DateTime DateOfBirth { get; set; }
[Display(Name = "Date of death")]
public DateTime DateOfDeath { get; set; }
public Boolean IsAlive { get; set; }
public string Description { get; set; }
// Foreign keys have corresponding navigation properties
// <NavigationProperty>ID naming convention cause EF to identify foreign keys
public int NationalityID { get; set; }
public int AreaID { get; set; }
// Navigation properties - defined as virtual to use LazyLoading
// Nationality and Area have a 1 to 1 relationship with philosopher
// Books has a 1 to many relationship with philosopher
public virtual Nationality Nationality { get; set; }
public virtual Area Area { get; set; }
public virtual ICollection<Book> Books { get; set; }
}

Try to use this:
CreateDatabaseIfNotExists<PhilosopherContext>
instead of this:
DropCreateDatabaseIfModelChanges<PhilosopherContext>
Also I would add:
public PhilosopherContext() : base("PhilosopherContext")
{
Database.SetInitializer<PhilosopherContext>(new CreateDatabaseIfNotExists<PhilosopherContext>());
}