How do you create a controller in Grails?
A controller handles requests and creates or prepares the response. A controller can generate the response directly or delegate to a view. To create a controller, simply create a class whose name ends with Controller in the grails-app/controllers directory (in a subdirectory if it’s in a package).
Can a variable name be used in Grails?
One thing to bear in mind is that certain variable names can not be used in your model: Currently, no error will be reported if you do use them, but this will hopefully change in a future version of Grails. In both of the previous two examples there was no code that specified which view to render. So how does Grails know which one to pick?
How does the edit action work in Grails?
The edit action starts with a Player command object; Grails fetches an existing Player object automatically, and the properties of that object are loaded as the initial values of the form in edit.gsp.
Why is player a command object in Grails?
Here, player is a command object, because it is an argument to the action. Behind the scenes, Grails will recognize this and rewrite your action to fetch existing records (if necessary), bind input data to the command object, perform dependency injection, and validate the object.
What are the plugins for the Grails framework?
Grails is a full stack framework and attempts to solve as many pieces of the web development puzzle through the core technology and its associated plugins. Included out the box are things like: GORM – An easy to use Object Mapping library with support for SQL, MongoDB, Neo4j and more.
How are URL patterns mapped in Grails framework?
The URL pattern can include variables, which are denoted by Groovy Strings within the pattern (e.g., $controller or $ {controller}. Grails has a few special wildcards which it supports out of the box. For example, $controller will be mapped to the name of a given controller, $action will be mapped to an action within that controller, and so forth.