[Catalyst] How to make chained actions nice?

[Danny Warren]

The Chained('.') parameter is used for chaining across controllers.  I 
understand your URI layout from your comments, but I don't understand 
what you are trying to do with all those weird Chained params you are using.

Here is how I would lay it out.  Read the perldoc again, it took me a 
few read-throughs to completely grok the subtleties of how chains work.


In MyApp::Controller::Object...

# Responds to /object/list
sub list : Local { ... }

# Captures object id, as in /object/[OBJ_ID]
sub object : PathPart('object') Chained CaptureArgs(1) { ... }

# Responds to /object/[OBJ_ID]/edit
sub edit : Chained('object') Args(0) { ... }

# Chain point for chaining to property controller
# NOTE: This is just a jump point, don't put bizlogic in here,
#       put it in the property controller
sub property : Chained('object') CaptureArgs(0) { ... }


In MyApp::Controller::Object::Property

# Responds to /object/[OBJ_ID]/property/list
sub list : Chained('.') Args(0) { ... }

# Captures property id, as in /object/[OBJ_ID]/property/[PROP_ID]
sub property : PathPart('') Chained('.') CaptureArgs(1) { ... }

# Responds to /object/[OBJ_ID]/property/[PROP_ID]/edit
sub edit : Chained('property') Args(0) { ... }


Hope that helps!
Danny Warren

Oleg Pronin wrote:
> Greetings.
> 
> I've got some kind of problem using chained actions.
> 
> There are some objects. Each object has a number of properties.
> 
> And this is how i want it to be:
> 
> URL for a list of objects is
> /object/list
> 
> URL for editing object is
> /object/OBJ_ID/edit (through chained action)
> 
> URL for list of object's properties
> /object/OBJ_ID/property/list
> 
> URL for editing property
> /object/OBJ_ID/property/PROP_ID/edit (through 2 chained actions)
> 
> I have MyApp::Controller::Object
> 
> sub list : Local {   ....   }
> 
> sub object : Chained('/') CaptureArgs(1) {
>     .... object-related-code ...
> }
> 
> Problem one is that i've got to write something like this:
> 
> sub edit : Chained('object') Args(0) { ....}
>                            ^^^^^^^
> i can't say Chained('.') because current path is "/object" and the chain 
> has
> "/object/object" path.
> I dont want to place the chain in the Root controller - this is wrong.
> 
> Problem two is how do i define last 2 urls.
> In MyApp::Controller::Object::Property
> 
> sub list : PathPart('property/list') Chained('/object/object') Args(0) {
> ... }
> 
> this is very ugly!
> 
> and finally
> 
> sub property : Chained('/object/object') CaptureArgs(1) { ... }
> sub edit : Chained('property') Args(0) { ... }  ( again, i can't say
> Chained('.') )
> 
> Do i do something wrong ? Why do i have to copy-paste a half of url to
> ParhPart and Chained attributes?
> How do i need to organize the structure of my controllers ?
> 
> I want to define such an actions in the way like this:
> 
> Controller::Object
> sub list : Local {...}                                         #
> /object/list
> sub object : Chained('/') CaptureArgs(1) {...}
> sub edit : Chained('.') Args(0) {...}                    #/object/ID/edit
> 
> Controller::Object::Property
> sub list : Chained('../') Args(0) {...}
> #/object/ID/property/list
> sub property : Chained('../') CaptureArgs(1) {...}
> sub edit : Chained('.') Args(0) {...}
> #/object/ID/property/ID/edit
> 
> Please somebody help!
> 
> 
> ------------------------------------------------------------------------
> 
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