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I have the Order table which contains information about a specific order, (when does it start, how many people, etc...) and that Order table has To-Many relationship to Menu Item table. I call that relationship "orderItems". The compiler gives me warning...
Started by on , 3 posts by 3 people.  
Just open....
You define a one-to-one relationship - one car to one driver an inverse is simple.
Lets say you have two tables - Cars and Drivers .
I ran into this warning and problem too! Here's what you need to know...
relationships).
Today somebody told me that interface implementation in C# is just "Can-Do" relationship, not "Is-A" relationship. This conflicts with my long-time believing in LSP(Liskov Substitution Principle). I always think that all inheritance should means "Is-A...
Started by on , 7 posts by 7 people.  
I wouldn't get too hung up about framework use interfaces to designate... .
For example, as you can define parameters as interfaces, types that implement, and sometimes they can represent more of a normal "is-a" relationship.
An Is-A relationship.
I the School class I have this code: from student in this.Students where student.Teacher.Id == id select student The Student class there are two relationships: Teacher and School. In the School class I'm trying to find out all the students whose Teacher...
Started by on , 4 posts by 4 people.  
} I guess that this.Students is....
For example: using (YourDataContext db = new YourDataContext()) { var query = from s in db.Students.Include("Teacher") where s.Teacher.ID == 1 select s; //etc.. .
The Include clause can be used in linq to entities query .
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I am using the database diagram to simply drag one column in a table to another to associate them and then trying to save it. i have done this a million times in the past with no problems. Both of the data types are the same, uniqueidentifier. Here is...
Started by on , 3 posts by 3 people.  
Run this query inside SQL Server Management Studio separately: ....
Are there customer orders with customer id's that don't exist in the customer table? It means that there's a CustomerID in the CustomerOrder which can not be found in the Customer table .
I have a 3rd party database where the primary key is a char datatype. When I run my query, I use an include to include the child table. The count is zero though. I look at sql profiler and results are returned. The only thing I can see is an issue with...
Started by on , 3 posts by 3 people.  
If I use in my query to select from the child and include the parent, get the first child in the list, then get a reference to the parent... .
I found a work around.
"1234 " != "1234"! The DB may not notice this, but the EF does .
Be careful with the Char type.
I have a problem with one-to-many relationships. I have the following domain classes: public class Installation : Entity<Installation> { public virtual string Name { get; set; } public virtual IList<Institution> Institutions { get; set; } ...
Started by on , 3 posts by 3 people.  
When you have a persistent collection with inverse="true" , then the child object owns the relationship to the relationship whenever you....
The relationship and any changes to the parent's collection will be reflected in the database.
Is there any way to set-up a symmetric self-join relationship mapping in NHibernate? Suppose we have two tables: Users id Relations id user1 user2 relation_type The User and Relation classes should look like this: class User { public virtual int Id { ...
Started by on , 3 posts by 3 people.  
relationship to Relation (eg a UserRelation table), rely on application code to enforce a 'two users per.
I create some items from a class X. I add them to de base, do SaveChanges and all this... The class Y has a relationship many-to-many with X. Using another Context, I create a Y instance, putting into the collection of X the elements I've created. I add...
Started by on , 3 posts by 3 people.  
[TestMethod] public void WorksWithAreaCategories() { using (new.
The relationship with Update.
I have a pretty simple setup. To sum it up here's what I'm doing: class Movie include MongoMapper::Document has_one :setting end class Setting include MongoMapper::EmbeddedDocument belongs_to :movie end What I want to do is to update the setting of a ...
Started by on , 3 posts by 3 people.  
So, for example, this does work: class Setting include MongoMapper::Document key :movie_id, ObjectId belongs_to :movie end class Movie include MongoMapper::Document... .
I'm pretty sure that has_one relationships aren't supported as embedded documents.
I have the following problem in django.. I have in models.py class Proposal(models.Model): #whatever.... credit =models.FloatField(null=True, blank=True) def save(): #here credit is saved based on some calculation (succesfully) class Author(models.Model...
Started by on , 4 posts by 4 people.  
If the above method worked as you expected it to, you'd still have the problem of having to save an Author.
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