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I built a dating site with django. It's no longer maintained, and most likely n | Hacker News
Browse all Wagtail's features. I wanted to build a site cataloging mountain bike trails complete with full GPS data. I decided not to pigeon-hole the site into just mountain biking, so a general purpose trail catalog would be my focus. As usual, scope creep crept in and I felt the need to do the following work above and beyond my initial feature set:. Lots of use of existing code and total time spent is now about 40 hours. It is live and usable in its current state, so I consider the project a success.
I held back on a lot of great features that I easily could have tinkered on for months.
As expected, it was more satisfying to launch a functional site than toil for months in the development stage. It provides a way to factor out common information at the Python level, while still only creating one database table per child model at the database level. When an abstract base class is created, Django makes any Meta inner class you declared in the base class available as an attribute.
Django does make one adjustment to the Meta class of an abstract base class: Of course, you can make an abstract base class that inherits from another abstract base class. The reverse name of the common. Finally, the reverse name of the rare.
The second type of model inheritance supported by Django is when each model in the hierarchy is a model all by itself. Each model corresponds to its own database table and can be queried and created individually. The inheritance relationship introduces links between the child model and each of its parents via an automatically-created OneToOneField. All of the fields of Place will also be available in Restaurant , although the data will reside in a different database table.
So these are both possible:.
If you have a Place that is also a Restaurant , you can get from the Place object to the Restaurant object by using the lower-case version of the model name:. However, if p in the above example was not a Restaurant it had been created directly as a Place object or was the parent of some other class , referring to p. However, there are a few limited cases where the child inherits behavior from the parent: If you forget, Django will raise a validation error. As mentioned, Django will automatically create a OneToOneField linking your child class back to any non-abstract parent models.
When using multi-table inheritance , a new database table is created for each subclass of a model.
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This is usually the desired behavior, since the subclass needs a place to store any additional data fields that are not present on the base class. Sometimes, however, you only want to change the Python behavior of a model — perhaps to change the default manager, or add a new method. This is what proxy model inheritance is for: You can create, delete and update instances of the proxy model and all the data will be saved as if you were using the original non-proxied model. The difference is that you can change things like the default model ordering or the default manager in the proxy, without having to alter the original.
Proxy models are declared like normal models. For example, suppose you want to add a method to the Person model.
You can do it like this:. The MyPerson class operates on the same database table as its parent Person class. In particular, any new instances of Person will also be accessible through MyPerson , and vice-versa:. You could also use a proxy model to define a different default ordering on a model. Proxy models inherit Meta attributes in the same way as regular models. There is no way to have Django return, say, a MyPerson object whenever you query for Person objects.
A queryset for Person objects will return those types of objects. The whole point of proxy objects is that code relying on the original Person will use those and your own code can use the extensions you included that no other code is relying on anyway. It is not a way to replace the Person or any other model everywhere with something of your own creation. A proxy model must inherit from exactly one non-abstract model class. A proxy model can inherit from any number of abstract model classes, providing they do not define any model fields. A proxy model may also inherit from any number of proxy models that share a common non-abstract parent class.
If you define a manager on the proxy model, it will become the default, although any managers defined on the parent classes will still be available. Continuing our example from above, you could change the default manager used when you query the Person model like this:. If you wanted to add a new manager to the Proxy, without replacing the existing default, you can use the techniques described in the custom manager documentation: With careful setting of Meta. However, that would be very repetitive and fragile as you need to keep both copies synchronized if you make any changes.
On the other hand, proxy models are intended to behave exactly like the model they are proxying for.
They are always in sync with the parent model since they directly inherit its fields and managers. Keep in mind that normal Python name resolution rules apply. The first base class that a particular name e. Meta appears in will be the one that is used; for example, this means that if multiple parents contain a Meta class, only the first one is going to be used, and all others will be ignored.
Note that inheriting from multiple models that have a common id primary key field will raise an error. To properly use multiple inheritance, you can use an explicit AutoField in the base models:. Or use a common ancestor to hold the AutoField. This requires using an explicit OneToOneField from each parent model to the common ancestor to avoid a clash between the fields that are automatically generated and inherited by the child:. In normal Python class inheritance, it is permissible for a child class to override any attribute from the parent class.
Model managers are inherited from abstract base classes. Overriding an inherited field which is referenced by an inherited Manager may cause subtle bugs. See custom managers and model inheritance. Some fields define extra attributes on the model, e. These extra attributes cannot be overridden unless the field that defines it is changed or removed so that it no longer defines the extra attribute. Overriding fields in a parent model leads to difficulties in areas such as initializing new instances specifying which field is being initialized in Model.
This restriction only applies to attributes which are Field instances.
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Normal Python attributes can be overridden if you wish. It also only applies to the name of the attribute as Python sees it: Django will raise a FieldError if you override any model field in any ancestor model. If you have many models, organizing them in separate files may be useful. To do so, create a models package. For example, if you had organic. Explicitly importing each model rather than using from.
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