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Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: entity framework 4 in action Sign up Entity framework - “Problem in mapping fragments”-error. Help me understand the explanations of this error up vote 40 down vote favorite 5 Error 3007: Problem in Mapping Fragments starting at lines 186, 205: Non-Primary-Key column(s) [WheelID] are being mapped in both fragments to different conceptual side properties - data inconsistency is possible because the corresponding conceptual side properties can be independently entity framework 4 transactionscope modified. I found several places on the web describing this error, but I simply don't understand them. (confused smiley goes here) One Two Three Four There is something pretty fundamental here, I must be missing. Can you explain it, so that I understand it? Maybe using my real life example below? Foreign key 1:N Wheels.Id -> Slices.WheelId I add them to entity framework, and WheelId is not visible in the Slices-entity. Doing some workaround (deleting the relationship from the db before adding tables to EF - then re-creating it and updating EF) I managed to get the WheelId to stay in Slices, but then I get the error mentioned at the top. entity-framework share|improve this question edited Aug 24 '12 at 9:42 AakashM 43.1k998155 asked Jun 19 '09 at 0:53 Kjensen 4,0762568125 add a comment| 9 Answers 9 active oldest votes up vote 37 down vote accepted Since Slices.WheelId is an FK, you cannot expose it in your client model, period. There are ways to get the value, though. var wheelId = someSlice.Wheels.ID; Update In EF 4 you can do this by using FK Associations
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Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Problem in mapping fragments in EF4 http://stackoverflow.com/questions/1015925/entity-framework-problem-in-mapping-fragments-error-help-me-understand-the up vote 4 down vote favorite Hi I have the following model: But when i compile with VS2010, i get the following error: Error 2 Error 3007: Problem in mapping fragments starting at lines 1784, 2018:Column(s) [createdby] are being mapped in both fragments to different conceptual side properties. What do i want ? Actually i want the Note entity to have FK to User entity. When http://stackoverflow.com/questions/4080363/problem-in-mapping-fragments-in-ef4 does the error appear ? When i add the FK User to Note i have the error. If i remove the link, no problem. What is the problem ? Thanks John entity-framework entity-framework-4 share|improve this question edited Nov 2 '10 at 17:33 asked Nov 2 '10 at 17:25 user96547 316818 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote My guess is that the association on the User entity has been defined on Username and Username is a candidate key (has a unique index defined on it) in SQL Server. While you can create a relationship based on this setup in SQL Server, current version of EF does NOT support creating associations based on candidate keys: In EF (3.5 and 4.0) FKs MUST point to Primary Keys. The only way to make this working is to create a new int field inside Note table (like UserId) and then create a new relationship between User.Id (PK) and Note.UserID (FK) and EF will happily create a association based on that for you. share|improve this answer edited Nov 2 '10 at 18:32 answered Nov 2 '10 at 17:38 Morteza Manavi 25.7k47876 w
ASP.NET Community Standup Forums Help Home/ASP.NET Forums/Data Access/ADO.NET, Entity Framework, LINQ to SQL, NHibernate/error 3007: Problem in mapping fragments starting http://forums.asp.net/t/2024105.aspx?error+3007+Problem+in+mapping+fragments+starting+at+lines+346+499+Column+s+TenantID+are+being+mapped+in+both+fragments+to+different+conceptual+side+properties+ at lines 346, 499:C... error 3007: Problem in mapping fragments starting http://encodo.com/en/blogs.php?entry_id=163 at lines 346, 499:Column(s) [TenantID] are being mapped in both fragments to different conceptual side properties. [Answered]RSS 1 reply Last post Dec 15, 2014 12:12 AM by Kevin Shen - MSFT ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered entity framework Threads Unresolved Threads Support Options Advanced Search Reply sudesh456 Member 271 Points 146 Posts error 3007: Problem in mapping fragments starting at lines 346, 499:Column(s) [TenantID] are bein... Dec 12, 2014 05:48 AM|sudesh456|LINK error 3007: Problem in mapping fragments starting at lines 346, 499:Column(s) [TenantID] are being mapped in both fragments to different conceptual side entity framework 4 properties. when I'm calling this. Entities.Include("tblTenant").ToListAsync(); entity mvc Sudesh Kumar Chhipa [Web Developer] GharAshiyana Reply Kevin Shen -... All-Star 16817 Points 2778 Posts Microsoft Re: error 3007: Problem in mapping fragments starting at lines 346, 499:Column(s) [TenantID] are... Dec 15, 2014 12:12 AM|Kevin Shen - MSFT|LINK Hi sudesh456, It seems that you did in the wrong way in configuring the relationship between two entities in your project. In addition, here is a similar issue which may give you right direction: http://stackoverflow.com/questions/1015925/entity-framework-problem-in-mapping-fragments-error-help-me-understand-the I suggest that you should check it first,if it still working ,please post your code about your entity and how did you configure the relationship. Best Regards, Kevin Shen. entity mvc Please Mark as Answer If it help you,thanks ‹ Previous Thread|Next Thread › This site is managed for Microsoft by Neudesic, LLC. | © 2016 Microsoft. All rights reserved. Privacy Statement| Terms of Use| Contact Us| Advertise With Us| CMS by Umbraco| Hosted on Microsoft Azure Feedback on ASP.NET| File Bugs| Support Lifecycle
database. EF treats everything—and I mean everything—as an object; the foreign key fields by which objects are related aren’t even exposed in the generated code. But I’m getting ahead of myself a bit. We wanted to figure out the most elegant way of mapping what we are going to call enumerated associations in EF. These are associations from a source table to a target table where the target table is a lookup value of type int. That is, the enumerated association could be mapped to a C# enum instead of an object. We already knew what we wanted the solution to look like, as we’d implemented something similar in Quino, our metadata framework (see below for a description of how that works). The goals are as follows: Properties of the enumerated type are stored in the database, including its identifier, its value and a mapping to translations. Relations to the enumerated value are defined in the database as constraints. The database is therefore internally consistent C# code can work with an enumerated type rather than a sub-object; this avoids joining the enumerated type tables when retrieving the main object or restricting to the enumerated type’s value.EF encourages—nay, requires—that one develop the application model in the database. A database model consists of tables, fields and relationships between those tables. EF will map those tables, fields and relationships to classes, properties and sub-objects in your C# code. The properties used to map an association—the foreign keys—are not exposed by the Entity Framework and are simply unavailable in the generated code. You can, however, add custom code to your partial classes to expose those values[1]: return Child.ParentReference.ID;However, you can’t use those properties with LINQ queries because those extra properties cannot be mapped to the da