Signals Signals and Flask’s Request Context Decorator Based Signal Subscriptions Core Signals Pluggable Views Basic Principle Method Hints Method Based Dispatching Decorating Views Method Views for APIs Fabric Using SQLite 3 with Flask SQLAlchemy in Flask Uploading Files Caching View Decorators Form Validation with WTForms Template Inheritance Message Flashing AJAX with jQuery Custom Error Pages Lazily Loading need and nothing you don’t. By default, Flask does not include a database abstraction layer, form validation or anything else where different libraries already exist that can handle that. Instead, Flask supports

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 1.13 Pluggable Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . need and nothing you don’t. By default, Flask does not include a database abstraction layer, form validation or anything else where different libraries already exist that can handle that. Instead, Flask supports as if it was implemented in Flask itself. Numerous extensions provide database integration, form validation, upload handling, various open authentication technologies, and more. Flask may be “micro”, but

forgery (CSRF) protection SQL injection protection Clickjacking protection SSL/HTTPS Host header validation Session security User-uploaded content Additional security topics Performance and optimization Forms The Forms API Form fields Model Form Functions Formset Functions Widgets Form and field validation Middleware Available middleware Middleware ordering Migration Operations Schema Operations fields | Built-in widgets Advanced: Forms for models | Integrating media | Formsets | Customizing validation The development process Learn about the various components and tools to help you in the development

forgery (CSRF) protection SQL injection protection Clickjacking protection SSL/HTTPS Host header validation Session security User-uploaded content Additional security topics Performance and optimization Forms The Forms API Form fields Model Form Functions Formset Functions Widgets Form and field validation Middleware Available middleware Middleware ordering Migration Operations Schema Operations fields | Built-in widgets Advanced: Forms for models | Integrating media | Formsets | Customizing validation The development process Learn about the various components and tools to help you in the development

fields | Built-in widgets • Advanced: Forms for models | Integrating media | Formsets | Customizing validation 1.8 The development process Learn about the various components and tools to help you in the development Chapter 1. Django documentation Django Documentation, Release 1.10.9.dev20171123183751 • Data validation 1.16 Other core functionalities Learn about some other core functionalities of the Django framework: example, requires that you give it a max_length. That’s used not only in the database schema, but in validation, as we’ll soon see. A Field can also have various optional arguments; in this case, we’ve set

fields | Built-in widgets • Advanced: Forms for models | Integrating media | Formsets | Customizing validation 1.7 The development process Learn about the various components and tools to help you in the development Messages framework • Serialization • Sessions • Sitemaps • Static files management • Data validation 1.15 Other core functionalities Learn about some other core functionalities of the Django framework: example, requires that you give it a max_length. That’s used not only in the database schema, but in validation, as we’ll soon see. A Field can also have various optional arguments; in this case, we’ve set

forgery (CSRF) protection SQL injection protection Clickjacking protection SSL/HTTPS Host header validation Session security User-uploaded content Additional security topics Performance and optimization Form fields Model Form Functions Formset Functions The form rendering API Widgets Form and field validation Middleware Available middleware Middleware ordering Migration Operations Schema Operations fields | Built-in widgets Advanced: Forms for models | Integrating media | Formsets | Customizing validation The development process Learn about the various components and tools to help you in the development

fields | Built-in widgets • Advanced: Forms for models | Integrating media | Formsets | Customizing validation 1.8 The development process Learn about the various components and tools to help you in the development Chapter 1. Django documentation Django Documentation, Release 1.11.30.dev20200305075726 • Data validation 1.16 Other core functionalities Learn about some other core functionalities of the Django framework: example, requires that you give it a max_length. That’s used not only in the database schema, but in validation, as we’ll soon see. A Field can also have various optional arguments; in this case, we’ve set

forgery (CSRF) protection SQL injection protection Clickjacking protection SSL/HTTPS Host header validation Session security User-uploaded content Additional security topics Performance and optimization Form fields Model Form Functions Formset Functions The form rendering API Widgets Form and field validation Middleware Available middleware Middleware ordering Migration Operations Schema Operations fields | Built-in widgets Advanced: Forms for models | Integrating media | Formsets | Customizing validation The development process Learn about the various components and tools to help you in the development

forgery (CSRF) protection SQL injection protection Clickjacking protection SSL/HTTPS Host header validation Session security User-uploaded content Additional security topics Performance and optimization Form fields Model Form Functions Formset Functions The form rendering API Widgets Form and field validation Middleware Available middleware Middleware ordering Migration Operations Schema Operations fields | Built-in widgets Advanced: Forms for models | Integrating media | Formsets | Customizing validation The development process Learn about the various components and tools to help you in the development