- Python 3 Web Development
- Python 3 Web Development
- Credits
- About the Author
- About the Reviewers
- www.PacktPub.com
- Preface
- 1. Choosing Your Tools
- Identifying the components of a web application
- Time for action getting an overview of a web application
- Choosing suitable tools
- Time for action choosing a delivery framework, also known as web server
- Time for action choosing a server-side scripting language
- Time for action choosing a database engine
- Time for action deciding on object relational mappers
- Time for action choosing a presentation framework
- Designing for maintainability and usability
- Time for action choosing a test framework
- Time for action maintaining overview
- Summary
- 2. Creating a Simple Spreadsheet
- Python 3
- Time for action installing Python 3
- CherryPy
- Time for action installing CherryPy
- Installing jQuery and jQuery UI
- Serving an application
- Time for action serving a dummy application
- Time for action serving HTML as dynamic content
- Time for action a unit convertor
- Time for action conversion using unitconverter.js
- Time for action converting a unit convertor into a plugin
- Designing a spreadsheet application
- Time for action serving a spreadsheet application
- The missing parts
- Summary
- 3. Tasklist I: Persistence
- Designing a tasklist application
- Time for action creating a logon screen
- Time for action running tasklist.py
- Python: the task module
- Time for action implementing the task module
- JavaScript: tasklist.js
- Time for action styling the buttons
- JavaScript: tooltip.js
- Time for action implementing inline labels
- Summary
- 4. Tasklist II: Databases and AJAX
- The advantages of a database compared to a filesystem
- Choosing a database engine
- Database-driven authentication
- Time for action authentication using a database
- Time for action getting the time with AJAX
- Time for action creating the task database
- Time for action retrieving information with select statements
- Time for action connecting to the database
- Time for action storing and retrieving information
- Time for action updating and deleting information
- Time for action testing factorial.py
- Time for action writing unit tests for tasklistdb.py
- Time for action putting it all together
- Have a go hero refreshing the itemlist on a regular basis
- Summary
- 5. Entities and Relations
- Designing a book database
- Time for action using the Entity class
- Time for action creating instances
- Time for action using the Relation class
- Time for action defining the Books database
- Time for action designing the delivery layer
- Time for action adding a new book
- Time for action using input fields with auto completion
- Time for action using an enhanced presentation layer
- Summary
- 6. Building a Wiki
- The data layer
- Time for action designing the wiki data model
- The delivery layer
- Time for action implementing the opening screen
- Time for action implementing a wiki topic screen
- Time for action editing wiki topics
- Additional functionality
- Time for action selecting an image
- Time for action implementing a tag cloud
- Time for action searching for words
- The importance of input validation
- Time for action scrubbing your content
- Time for action rendering content
- Summary
- 7. Refactoring Code for Reuse
- Time for action taking a critical look
- Refactoring
- Time for action defining new entities: how it should look
- Time for action using metaclasses
- Time for action implementing the MetaEntity and AbstractEntity classes
- Time for action defining new relations: how it should look
- Time for action using a table-based Entity browser
- Time for action examining the HTML markup
- The books application revisited
- Time for action creating a books application, take two
- Summary
- 8. Managing Customer Relations
- 9. Creating Full-Fledged Webapps: Implementing Instances
- Even more relations
- Time for action showing one-to-many relationships
- Time for action adapting MetaRelation
- Time for action enhancing Display
- Time for action enhancing Browse
- Access control
- Time for action implementing access control
- Role-based access control
- Time for action implementing role-based access control
- Summary
- 10. Customizing the CRM Application
- A. References to Resources
- B. Pop Quiz Answers
We learned a lot in this chapter about implementing a web application that consists of more than a few entities and their relations.
Specifically, we covered:
- How to create a data model that describes entities and relations accurately
- How to create a delivery layer that is security conscious and treats incoming data with care
- How to use jQuery UI's dialog widget and extend the functionality of the autocomplete widget
We also encountered some limitations, especially in our entity/relation framework. It is, for example:
- Quite a lot of work to initialize the database as each entity and relation needs its own initialization code
- Unwieldy to specify things like sort order when retrieving entities
- Difficult to check input values or display formats in a uniform way
- Difficult to differentiate between different types of relations, like one-to-many or many-to-many
This hardly poses a problem for our moderately complex wiki application, but more complex applications can only be built with a more flexible framework which is the topic of the next chapter.
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