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Django: Python Web Development Unleashed

Project Solution: Updating Songs

Explore how to update songs in a Django project by creating ModelForms, setting up dynamic routing paths, and writing view functions to process form data. This lesson helps you implement an edit feature for songs, handle GET and POST requests appropriately, and modify database records, enhancing your web app development skills in Django.

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Solution

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Explanation

We made the following modifications to the project in order to implement the updating feature:

zing_it/forms.py file

  • At lines #18 to #23, we made an Edit form. This form is a ModelForm corresponding to the Song model. We discussed model forms previously in the Model Form lesson.

zing_it/urls.py file

  • At line #10, we defined a path for our edit view function with a dynamic rule. We can recall this concept from the lesson Static and Dynamic Routing. The rule /edit/<int:id> will correspond with /edit/ followed by an integer. We are considering the integer value to be the id of a Song instance.

zing_it/views.py file

  • At line #90, we created a view function called edit that takes in an id parameter. The id corresponds to the id of Song in the database.

  • At lines #91 to 92, we are creating an Edit form instance by using the form obtained in request. If we did not receive a form in request, then the condition on line 92 will return false, and line 111 will be executed where a new form will be sent to the template. This condition can occur in two cases, firstly when the server receives a GET request, and secondly if the validation fails in the form fields.

  • At lines #93 to #97, we retrieved the data from the Edit form fields.

  • At line #99, we are retrieving the song record from the database that needs to be updated. We have used the get() function for the retrieval.

  • At lines #101 to #107, we are updating the song object with the values obtained from the form and saving the new information.

templates/zing_it/edit.html file

  • This template is almost identical to signup.html.

Note: This was the last challenge in this course. However, the project is still incomplete. This project is a good starting point for you to use and build upon. You can create a full-fledged website with the skills that you now have in your arsenal. Feel free to download the code and play with it more!