Redmine

hi

i am writing an wiki extension which shows all issue(tickets) out of an Easy Red Mine.
I want to read out the Project id, the subject and the spent_time attribute out of the issue.json file,
but it doesnt show any entry for the spent_time attribute
If I call the Json file over this url: /issues/4341.json it contains the spent_hours attribute
if I call the Json file over the project id it doesnt contain the the spent_hours attribute

{
    "issue": {
        "id": 4341,
        "project": {
            "id": 70,
            ...
        },
        ...
        "subject": "...",
        "description": "...",
        "start_date": "2016-09-15",
        "due_date": "2016-09-23",
        "done_ratio": 0,
        "estimated_hours": 1.0,
        "spent_hours": 0.01666666753590107,       <<<
        "total_spent_hours": 0.01666666753590107, <<<
        ...
        "created_on": "2016-09-15T09:49:24Z",
        "updated_on": "2016-11-03T12:23:32Z" 
    }

/issues.json?project_id=70

{
    "issues": [{
        "id": 4341,
        "project": {
            "id": 70,
            ...
        },
        ...
        "subject": "...",
        "description": "...",
        "start_date": "2016-09-15",
        "due_date": "2016-09-23",
        "done_ratio": 0,
        "estimated_hours": 1.0,
        ...
        "created_on": "2016-09-15T09:49:24Z",
        "updated_on": "2016-11-03T12:23:32Z" 
    }],
    "total_count": 1,
    "offset": 0,
    "limit": 25
}