Grails Controller Part 1

Topics 

• Controller and actions 
• Scopes 
• Models and views 
• Rendering 
• Controller interceptors 
• Redirecting
• Data binding (params) 
• XML and JSON responses

Controllers & Actions

Method vs Closure as Actions 

• Actions in a controller can be in the form of 
  • method or 
  • closure 
• Methods are preferred (over closure) because they are 
  • Memory efficient 
  • Allow use of stateless controllers (singleton scope) 
  • You can override actions in subclasses 
  • Methods can be intercepted with standard proxying mechanisms, something that is complicated to do with closures – this is because, in closure, the actions are in the form of fields

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