datamodel

I have an issue while trying to develop a data model for my application with Qt/QML. I already used a QAbstractListModel to be able to pass customs data model from C++ to QML and it worked like a charm with simple model (such as a model based on strings and bools). But now I need to build a more difficult model and I was wondering if it was possible to use a QAbstractListModel inside another QAbstractListModel . Let me explain myself. I have a data model called model_A build like that : model_A.h: #ifndef MODEL_A_H #define MODEL_A_H #include <QAbstractListModel> #include <QList> class model_A

I am using Sequelize.js to do a double join on the same table. I have a set of Team objects and a set of Game objects. A team hasMany Games, so it would have foreign keys in the game table, but there are two teams in every game so i need to join the table twice. What is the best way to do this using the sequelize ORM. Team = sequelize.define('teams',{ name : Sequelize.STRING, location : Sequelize.STRING, }); Game = sequelize.define('games',{ homeTeamId : Sequelize.INTEGER, awayTeamId : Sequelize.INTEGER, location : Sequelize.STRING, }); // Associations Game.hasOne(Team, {foreignKey :

I am trying to create a class that stores data in a local buffer as well as acts as an interface to a database. I've got following code: class Table(object): def __init__(self, tableName, **columnDict): self.tableName = tableName self.columns = {} self.types = {} self.columns['id'] = [] self.types['id'] = 'INT PRIMARY KEY NOT NULL' for name in columnDict: self.columns[name] = [] self.types[name] = columnDict[name] def updateBufferRow(self, index, updateDict): for key in updateDict: self.columns[key][index] = updateDict[key] def getBufferRow(self, index): row = {} for key in self.columns: row

On my start page, I'd like to display the first items from several different lists that I have on other pages - somewhat like the "recent" page here on SO displays both recent posts and recent comments. In my case I want to list the two most recent posts in a guest book, and the next upcoming event. In order to do this, how can I pass several Model objects to my View? Is it even possible? If not, how should it be done? An alternative to tvanfosson's solution is to create a strongly-typed view so that you get cvompile-time checking and less "magic strings." Example... Assume you have the class:

Let's assume I have two Entities in my Symfony2 bundle, User and Group . Associated by a many-to-many relationship. ┌────────────────┐ ┌────────────────┐ ┌────────────────┐ | USER | | USER_GROUP_REL | | GROUP | ├────────────────┤ ├────────────────┤ ├────────────────┤ | id# ├---------┤ user_id# | ┌----┤ id# | | username | | group_id# ├----┘ | groupname | | email | | created_date | | | └────────────────┘ └────────────────┘ └────────────────┘ What would be a good practice or a good approach to add additional columns to the join table, like a created date which represents the date when User joined

In xcode 3 there was a helpful feature in the data model builder where you could highlight some attributes/relationships in an entity, right-click, and choose to copy method and property declarations to the clipboard. (You could choose if you wanted objective-c 2.0 property declarations also). Then you could paste them into your NSManagedObject subclass. I see how you can still generate the entire class file; but this isn't helpful if you are adding attributes to an existing entity. Have they removed this feature from xcode 4? I used it all the time! See the Core Data Model Editor Help:

Situation: A company has many projects A project has many tags A project belongs to only 1 company A tag can belong to multiple projects A company must have access to its own tags Example 1: In the first image, all tags for the company are available through the projects/project_tag. But if all projects are removed, then the tags for the company will not be accessible anymore, because the link between project_tag and projects is gone. The tags should be somehow always be linked to the company, even if there are no projects. Example 2 (where tags are also linked to the company): In the second