This is a really weird error, I have looked online and can not see any obvious reasons why this is happening.
I am using Database First Entity Framework version 5 and have added 4 tables called:
WorkStatus
JobStatus
SubJobStatus
SubJobStageStatus
JobStatus, SubJobStatus and SubJobStageStatus each has a foreign key constraint to WorkStatus.
I have updated my edmx to include these tables but for some reason each table is missing the last s from the word Status. So the tables and their navigation properties are now called:
WorkStatu
JobStatu
SubJobStatu
SubJobStageStatu
Does anyone know why this happens?
"-Status" is being interpreted as a plural, and Entity Framework is being "helpful" by de-pluralizing.
For example, if you have a table called "Customers" EF will generate an entity called "Customer", which is in fact nicer in code:
var customer = new Customer();
It isn't working out so well in your case; your tables are already singular.
You can rename your tables to "-Statuses" or update the names in the designer or disable pluralization:
Under Tools > Options
Entity framwork made a entity for each of my tables except for one, and I'm not sure why. I select it when i generate it from the database.
Here is my entity framework diagram, and the diagram in SQL:
http://imgur.com/a/zY17T
Notice how RecipeMeal is missing from entity framework. Does anyone have an idea why this might be happening?
RecipeMeal is supposed to store if a recipe is breakfast, lunch etc. It's not a column of Recipes because a recipe could be a lunch OR dinner recipe, as an example.
I am using EF 5.0
Thanks.
Entity Framework has built-in support for many-to-many relationships.
The table is exposed through the two ICollection<T> properties in Meal and Recipe.
I also found that if your table doesn't have a primary key it will also get skipped. One of my tables was just a summary table and didn't really need a primary key and it wouldn't be included in the reverse engineer. As soon as I added a primary key it was picked up.
When I update my edmx from database ( I added primary keys on many-to-many relation table)
I get duplicated properties like
InstantceType and InstanctType1, for each refresh from db I get a new property
any idea as to what is causing this?
It is probably that the EF model has become confused (corrupted) after the keys were added. A many-to-many table is a bit special, since it will not show up as an entity in an EF diagram if it only contains keys.
To fix this problem, the simplest solution would be to delete the model and then regenerate it.
I've a problem mapping just one table from database, I add several tables using "Update model from Database" function through Visual Studio 2010 interface, and everyone works as expected except one table!
Looking at "Model Browser" I can see the table doesn't appear under "Entity Types" but it is present under section "ObjectEntity.Store", so my POCO Generator create an entity related and I can't try to add it again from database but I can't access it through context (like context.table_name).
Tha table doesn't have particular form, there are just two key fields
Could someone help me?
Thanks
I guess it is junction table for implementing many-to-many relation, isn't it? In such case it is correct behavior. EF will hide this table because it is not needed in object oriented approach where many-to-many association can be modeled directly without helper entity. You will see in your model that those two related entities are connected by line with * - * multiplicity and each entity will contain navigation property which is collection of related entities. By manipulation with entities in these collections you are creating or removing records in that hidden table. That is the way how you work with such relation in EF.
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 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.
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 instead of independent associations.
Try to remove foreign property column from Entity set using entity model design it will solve your problem
For example
We have two tables one is customer and other one is order, using entity model design we added association between customers and orders when we do this Ado.net entity framework i will add navigation properties to both below tables.
Like
Customer.Orders - Here order is list
Order.Customer
One - Many relation.
So we need to remove property from with name CustomerId[Foreign key column] from Order entity set.
For reference:
http://social.msdn.microsoft.com/forums/en-US/adodotnetentityframework/thread/2823634f-9dd1-4547-93b5-17bb8a882ac2/
I was able to overcome this problem by the following steps:
right click the designer window
Select 'update model from database'
Select Add AND make sure that the 'Include foreign key columns in the model' checkbox is selected.
click on Finish...
I had set foreign keys up in the database but framework still wasn't pulling them in correctly. So I tried to add the association myself.
However, when I did this I would get a mapping error. It took me A WHILE but I figured out. What I did was set up the association using the entity toolbox association tool and then you have to double click on the association (1 to many) line and set the primary and foreign key there. Hopefully, this to help others who might have the same problem. I couldn't find the answer anywhere.
I had this problem for quite a different reason, and the message was slightly different; it didn't say "data inconsistency is possible because the corresponding conceptual side properties can be independently modified."
I have a table involved in my model with a binary column where I store image data. I only want this data returned when I need it (performance is a feature), so I split the table using a method similar to this. Later on, I added a property to that table, then updated the model from the database. The wizard added the property to both entity types that refer to the table with the added property. I had to delete it from one of them to solve the error.
I've had this happen because Entity Framework Update wizard mismapped some keys (or did not update?). As a result, some columns were mistakenly labeled as keys, while actual key columns were treated as plain columns.
The solution was to manually open EDMX file, find the entities, and update the keys.
Couldn't get any of the answer to work with EF6. The problem seems to be the framework doesn't import the foreign keys correctly as Associations. My solution was removing foreign keys from the tables, and then manually adding the associations using Entity Framework model, using the following steps: Entity Framework - Add Navigation Property Manually
For LinQ to Entities queries in EF1, my workaround for not having access to the foreign key as a property is with the following code, which does not produce a join query to the associated table:
dbContext.Table1s.FirstOrDefault(c => (int?)c.Table2.Id == null)
i.e, the generated SQL is:
...WHERE ([Extent1].[Table2Id] IS NULL)...
Solution is to allow deleting Rule = Cascade on Sql association.
Same thing as to be done on .edmx model, adding element to
association:
<Association Name="FK_Wheels_Slices">
<End Role="Wheels" Type= "your tipe here" Multiplicity="1">
<OnDelete Action="Cascade" />
</End>
</Association>
I had a table already mapped in EF. I added two more tables which had foreign keys in the previously added table. I then got the 3007 error.
To fix the error I deleted all three tables from the EDMX file, and then re-added them all at once together (via "Update Model from Database..."), instead of in stages.
I checked my Error List window and noticed I had errors in the model. Fixed them and all is well
in my case I solved this error by tick (include foreign key columns in the model)
- update Model from database
- tick (include foreign key columns in the model)
- finish