[英]Entity framework fluent mapping many-to-may
尝试映射此模型时出现问题:
public class Discipline
{
public int Id {get;set;}
public string Name{get;set;}
public virtual ICollection<DisciplineRequirement> Requirements {get;set;}
}
public class DisciplineRequirement
{
public int DisciplineId {get;set;}
public int RequiredDiscipline {get;set;}
public virtual Discipline Discipline {get;set;}
public virtual Discipline RequiredDiscipline {get;set;}
}
映射代码:
public class DisciplineMap : EntityTypeConfiguration<Discipline>
{
public DisciplineMap()
{
ToTable("Discipline");
HasKey(p => p.Id);
HasMany(p => p.Requirements)
.WithRequired(p => p.Discipline)
.HasForeignKey(p => p.DisciplineId);
HasMany(p => p.Requirements)
.WithRequired(p => p.RequiredDiscipline)
.HasForeignKey(p => p.RequiredDisciplineId);
}
}
public class DisciplineRequirementMap : EntityTypeConfiguration<DisciplineRequeriment>
{
public DisciplineRequirementMap()
{
ToTable("DisciplineRequirement");
HasKey(p => new
{
p.DisciplineId,
p.RequiredDisciplineId
});
HasRequired(p => p.Discipline)
.WithMany(p => p.Requirements)
.HasForeignKey(p => p.DisciplineId);
HasRequired(p => p.RequiredDiscipline)
.WithMany(p => p.Requirements)
.HasForeignKey(p => p.RequiredDisciplineId);
}
}
我有这个错误:
在模型生成期间检测到一个或多个验证错误:要求:FromRole:NavigationProperty“要求”无效。 关联类型'Discipline_Requirements'中FromRole'Discipline_Requirements_Target'的类型'DisciplineRequeriment'必须与声明了该NavigationProperty的类型'Discipline'完全匹配。
有人可以在这里给我个灯吗?
恕我直言,您必须具有两个导航属性(或者至少如果只有一个,则无法使用两个FK对其进行配置)
public class Discipline
{
public int Id {get;set;}
public string Name{get;set;}
public virtual ICollection<DisciplineRequirement> Requirements {get;set;}
public virtual ICollection<DisciplineRequirement> RequiredBy {get;set;}
}
public class DisciplineRequirement
{
public int DisciplineId {get;set;}
public int RequiredDisciplineId {get;set;}
public virtual Discipline Discipline {get;set;}
public virtual Discipline RequiredDiscipline {get;set;}
}
同
public class DisciplineMap : EntityTypeConfiguration<Discipline>
{
public DisciplineMap()
{
ToTable("Discipline");
HasKey(p => p.Id);
}
}
public class DisciplineRequirementMap : EntityTypeConfiguration<DisciplineRequeriment>
{
public DisciplineRequirementMap()
{
ToTable("DisciplineRequirement");
HasKey(p => new
{
p.DisciplineId,
p.RequiredDisciplineId
});
HasRequired(p => p.Discipline)
.WithMany(p => p.RequiredBy)
.HasForeignKey(p => p.DisciplineId);
HasRequired(p => p.RequiredDiscipline)
.WithMany(p => p.Requirements)
.HasForeignKey(p => p.RequiredDisciplineId);
}
}
应该足够了。
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