[Bf-committers] Saving and retreiving custom object properties

[patrick boelens]

Hey Codeman,

Thanks for your explanation and the link; makes perfect sense now! =)

Cheers,
Patrick

> Date: Sun, 23 Feb 2014 14:19:11 +0100
> From: codemanx at gmx.de
> To: bf-committers at blender.org
> Subject: Re: [Bf-committers] Saving and retreiving custom object properties
> 
> Hey Patrick,
> 
> there are different kinds of properties, see:
> 
> http://wiki.blender.org/index.php/Doc:2.6/Manual/Extensions/Python/Properties#Summary
> 
> There are only ID-Properties internally, but ID-Props and static props 
> are separated from python perspective.
> 
> What you seem to use are ID-Properties, which are a set per datablock.
> Get and set them like:
> 
> someObject['prop']
> someObject['prop'] = 123
> 
> In contrast, static properties (bpy.types.*.prop = bpy.props.*) are 
> accessed like:
> 
> someObject.prop
> someObject.prop = 123
> 
> Don't mix it up, like:
> 
> someObject['prop'] = "foobar"
> print(someObject.prop)
> 
> or you will get errors like:
> 
> # ['prop']
> KeyError: 'bpy_struct[key]: key "prop" not found'
> 
> # .prop
> AttributeError: 'Object' object has no attribute 'prop'
> 
> Due to how properties are handled internally, both "prop" properties 
> will conflict. You should avoid name duplicates. You can easily run into 
> funny behavior it seems - edit a static prop in Custom Properties panel 
> via Edit popup, and set value to a number or list - static prop will be 
> cleared and no ID property exists either!.
> 
> Submitted a bug report:
> https://developer.blender.org/T38778
> 
> 
> Am 23.02.2014 04:58, schrieb patrick boelens:
> > Hi everyone,
> >
> > I've been asked to revisit an old addon I did and make it up-to-date, and in doing so I noticed something. While object properties are saved with the .blend, they are only accessable through a key, and no longer as a property of that object. Is this intended behaviour? If so, is there a reason for this? It seems a bit counter-intuitive imho. Here's an example of what I mean:
> >
> > - Open Blender
> > - Enable addon
> > - Perform an addon function and set "someObject.prop = 5"
> > - Request "someObject.prop"
> >     - Returns 5
> > - Save .blend and close Blender
> > - Reopen, re-enable addon and request "someObject.prop"
> >     - Returns property not found error
> > - Request "someObject['prop']"
> >     - Returns 5
> >
> > Cheers,
> > Patrick
> >   		 	   		
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