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Descubra todo lo que Scribd tiene para ofrecer, incluyendo libros y audiolibros de importantes editoriales. Django tutorial. October 22, This tutorial will make use of the eclipse IDE, with the pydev extension installed. For a complete installation of python, django,.

Setup environment. To start we will setup a complete django environment in eclipse. Open Eclipse. Click next again. Fill out the last form, make sure django 1. Right click on the project not subfolders. Notice a console is opened inside eclipse that shows some basic information of the development server. In this console there are buttons provided to stop or restart the server. The eclipse interface did some work for us behind the screens, it invoked many django manage commands which you would otherwise have to execute manually.

Note however that all these commands can also be called through the django submenu of the eclipse project. Here we will create a very simple view that will display only the classic "Hello world! First we start by creating a new application inside the django project. Note that after creating the application we need to add it to the project settings, this is necessary to use it in the database, which will be covered further in this tutorial. Call the application members.

Click OK. Open settings. Add djangolesson. Only the test. While testing is an essential part of modern high-quality applications, it is a topic on itself that is not covered in this tutorial. Create view method. Open the views. HttpResponse "Hello. As you can see, a view is a simple python function that takes at least one variable, the request. The view. Name it urls and leave the other values as they are. These can become quite complex but the basics are simple.

Models and the django admin. The Member model contains some basic information like name and address and points to one Study object, which contains the name of the study and corresponding year. This way, when a study name changes we can easily change it for all members in this study, we do not have to update each member, just the study object. This process is called normalization and is very essential for modern database design. In the members application, open the models.

Study models. Model :. Member models. ForeignKey Study. Each model is a class derived from the django base class django. Some types require extra arguments, e. Most types also accept a lot of optional arguments that can be used to constrain the data, e. When a Model object. In the code listing you can see how the self keyword is used to access object variables. Also, in the Member example it is shown how to do python string formatting, always. Additionally, it is good practice to provide each model with a.

While we now have a representation of our models in django, they still do not exist in the database. Django provides an easy command to create these straight from the models code. This command is called syncdb. Now that we have a some models we will show the easiest way to populate them with data, using the built-in django admin interface. To do this we must follow some simple steps.

First we have to add our models to the admin system, therefore we create a admin. This very basic admin script just adds each model to the default admin site. Change it to look like this:. Run syncdb again the admin application added some new models. Re-launch the django project as before. Add some members with corresponding studies, we will use those later. In this section we will show how to use models in views, we will create a new function in the views.

Next, we create the new function as follows. HttpResponse result. This function simply loops over all member objects and adds the string representation remem-. Finally, add a new entry to the urls. Afterwards a normal HttpResponse object. Certainly when you want to display a real webpage this will contain a.

This is. Essentially views will pass data to templates which will place it inside of html content using a very simple template language that can be easily learned by designers.

We start by creating separate template folders in the djangolesson module note: this is not the eclipse project but the python module with the same name right beneath it. Now add another folder called members to the newly created templates folder. It is good practice to use the same structure for your templates folder as for your applications.

The result should look like this, make note this should contain the whole path, it can not be relative to the project directory. Note that eclipse will open this by default with a built-in browser. Now enter following html code:.

A full list of built-in template tags and variables can be found in the django documentation 1. In this example we use the for tag to loop over a list members which we received from the view, similar to a python for loop.

Each item of this list will be a member object which we can handle in almost exactly the same way as in normal python code. We display the list very similar to the original view. It accepts 2 arguments, the template name and a python dictionary with the values it should pass. To use it, import it at the top of views. In normal python code we could just call values["members"] to use it. Putting everything together we can change the view from the previous section to this.

While you already have all the building blocks for a basic website, we will go deeper in one last very useful and very powerful system that django provides: forms. Forms help taking responsibilities away from views, making the code lighter and easier to maintain and reuse.

The main function of a Django form is to validate input and decide which action to take with that input. An additional feature is that django forms allow to easily generate HTML forms. Sadly enough, many people use forms only for this target, which results once again in long views to handle input processing.

In the members application, create a new module called forms. The form should look like this. NameForm forms. Form :. ValidationError "Name. Therefore we added a method to get the name. After getting the name we check if the length is smaller than 3 and if so we raise an errormessage which django will translate into an error message in the form itself.

NameForm request. This very simple example creates the form with whichever input request. GET contains can. After the. Depending on this result we choose between two templates to be rendered. Note that if no input is given, request.

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Descubra todo lo que Scribd tiene para ofrecer, incluyendo libros y audiolibros de importantes editoriales. Django tutorial. October 22, This tutorial will make use of the eclipse IDE, with the pydev extension installed. For a complete installation of python, django,.

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