relational-database

This should be a simple question for the well versed EF user. I have the following schema (in my head) of how the relationships between the tables should look. [FooBar] [Foo] [Bar] FooId PK,FK Id PK Id PK BarId PK,FK BarId FK Name IsRead Name Description Description Though, when I try to generate the schema using EF code-first it fails to interpret the relationships between the entities as I've interpreted them (adds foreign key FooId to the [bar] table) and fails to fully create the [FooBar] bridge table. If someone could guide me on how to achieve the above schema using EF4 code-first I'd

Using SQLServer : I have a table user : id name email There are some other tables (about 200 more tables), some of which use user.id as foreign key on cascade delete . So, I want to find out - Which tables use this foreign key ( user.id ) ? I am accessing my sql-server with SQL Server Management Studio . In SQL server management studio, you can right click your table in the object explorer, and then select 'View Dependencies'. This will open a new window in which you can see all other objects (not just tables) that depend on your table, and on which your table depends. The way to get ONLY

I am currently setting up a database which has a large number of many-to-many relations. Every relationship was modeled via a link table. Example: A person has a number of jobs, jobs are fulfilled by a number of persons. A person has a number of houses, houses are occupied by a number of persons. A person has a number of restaurants he likes, restaurants have a number of persons who like the restaurant. First I designed this as follows: Tables: Person, Job, House, Restaurant, Person_Job, Person_House, Person_Restaurant. Relationships 1 - n: Person -> Person_Job, Person -> Person_House, Person

I'm not quite sure if I understand the associate method in Laravel. I understand the idea, but I can't seem to get it to work. With this (distilled) code: class User { public function customer() { return $this->hasOne('Customer'); } } class Customer { public function user() { return $this->belongsTo('User'); } } $user = new User($data); $customer = new Customer($customerData); $user->customer()->associate($customer); I get a Call to undefined method Illuminate\Database\Query\Builder::associate() when I try to run this. From what I can read, I do it exactly as is stated in the docs. What am I

I have 2 tables, User and Employee . Each user is given a User_ID and that is a primary key in the User table and a foreign key in the Employee table. Can that attribute in the Employee table also be a primary key? If you have a one-to-one relation between two tables, then the primary key of the details table is a foreign key as well. master detail (1 : 1) +----------+ 1:1 +-------------+ | PK id |<---o| PK FK id | +----------+ +-------------+ | col1 | | col1 | | col2 | | col2 | | etc. | | etc. | +----------+ +-------------+ If you have a m-to-n relation, the junction table has columns

I'm quite new to this and I'm using cancan + devise for my user auth. However I'm not really sure what it means to set up a typical users HABTM roles relationship nor do I really understand what a HABTM relationship is. Can anyone explain it really well or point me to a good tutorial or example? HABTM means has and belongs to many. You basically need a table as a middle man to track multiple id's (called a through table). When referenced as a typical users HABTM roles relationship, they really mean there would be a User model, Role model, users table, roles table, and a roles_users table. Don

tl;dr: how do i implement a permissions model like (e.g.) github's Updated to try to address some of @philipxy's comments: I am planning to implement a permissions model similar to github's: users users can be in groups users can be in organizations groups can be in organizations a user will be permitted any of C, R, U, and D operations on an asset, group, or organization as : an individual user who has been permitted those (any of C, R, U, D) operations a member of a group which has been granted those permissions a member of an organization that has been granted those permissions or as a