The Survey application models

A common place to start development of a new Django application is with the models: the basic building blocks of data that are going to be manipulated and stored by the application. A cornerstone model for our example market research survey application will be the Survey model.

A Survey is going to be similar to the Django tutorial Poll model, except that:

• Where the tutorial Poll only contains one question, a Survey will have multiple questions.

• A Survey will have a title for reference purposes. For the tutorial Poll, a single question could be used for this.

• A Survey will only be open for responses for a limited (and variable, depending on the Survey instance) time. While the Poll model has a pub_date field, it is not used for anything other than ordering Polls on the index page. Thus, Survey will need two date fields where Poll has only one, and the Survey date fields will be used more than the Poll pub_date field is used.

Given just these few simple requirements...