I'm trying to use graph.create via json api to create a graph and it seems to always ignore the hostid I set.
I have tried all possible combinations of params:

"hostid": 10087
"hosts": [ "10087" ]
"hosts": [

{ "hostid": "10087" }

]
"hostids": [ "10087" ]
"hostids": [

{ "hostid": "10087" }

]

It always ignores the hostid and tries to create the graph in the first host in the table (first one created).