OpenMaya command that checks if attribute has animation?

[kiteh]

Hi all, I need some help with getting animation curves using OpenMaya.

I have 3 cases in which nodes in scene will be generated:

• Manual keyed
• By constrains
• Use of anim layers

In my code, I was able to get the first scenario working. And so I thought it will work for the other 2 but turns out it is not.

Here is my code: https://pastebin.com/raw/YKupFfsW and I have attached a scene file for use.

In the code, if you un-comment `scenario1` and comment `scenario2`, I will get the following error:

# Error: (kInvalidParameter): Object is incompatible with this method

# Traceback (most recent call last):

#   File "<maya console>", line 66, in <module>

#   File "<maya console>", line 27, in rotation_check

# RuntimeError: (kInvalidParameter): Object is incompatible with this method # 

Whereas if you comment out `scenario1` and uncomment `scenario2`, a different error will be spawn if the specified node inputted is either ["test_animLayer"] or ["test_constrained"]:

# Error: (kFailure): Object does not exist

# Traceback (most recent call last):

#   File "<maya console>", line 61, in <module>

#   File "<maya console>", line 42, in rotation_check

# RuntimeError: (kFailure): Object does not exist # 

1. My question here would be, why does the error between scenario differs (so much) at different line? I would have expected them to error out at line 27 in scenario 1, since "test_animLayer" and "test_constrained" are in the seelction...

2. Given in the above cases, is there an OpenMaya command that I can use to effectively determine either of the cases has an animation curve?