我有一个有一对多关系的班级。我想在关系中归还所有父母的孩子;具体来说,我想返回子表中的所有JSONB对象。
这些是我的班级:
class ParentChild(Resource):
def get(self, id):
result = db.session.query(Parent).get(id)
result_child = result.children
return {'child': result_child}
然后使用Flask Restful,我试图选择所有这样的孩子:
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: <sqlalchemy.orm.dynamic.AppenderBaseQuery object at 0x106178da0> is not JSON serializable
有一个错误:
using ExcelDna.Integration;
using Excel = Microsoft.Office.Interop.Excel;
[ExcelFunction(Category = "Foo", Description = "Sets value of cell")]
public static Foo(String idx)
{
Excel.Application app = (Excel.Application)ExcelDnaUtil.Application;
Excel.Range range = app.ActiveCell;
object[2,2] dummyData = new object[2, 2] {
{ "foo", "bar" },
{ 2500, 7500 }
};
var reference = new ExcelReference(
range.Row, range.Row + 2 - 1, // from-to-Row
range.Column - 1, range.Column + 2 - 1); // from-to-Column
// Cells are written via this async task
ExcelAsyncUtil.QueueAsMacro(() => { reference.SetValue(dummyData); });
// Value displayed in the current cell.
// It still is a UDF and can be executed multiple times via F2, Return.
return "=Foo()";
}
答案 0 :(得分:1)
如果您想获得父母的每个孩子的所有data
个对象。您可以执行以下查询:
result_child = db.session.query(Child.data).filter(Child.parentid == id).all()
如果您想使用children
关系,可以迭代它:
result_child = [child.data for child in result.children]