Hi,
I tried using direct plain JSON:
my model
class Student(db.Model):
__tablename__ = 'students'
id=db.Column(db.Integer, primary_key=True,autoincrement=True)
name=db.Column(db.String(200))
roll_no=db.Column(db.Integer)
data_test=db.Column(db.JSON)
I tried this:
*a = Student.query.filter(cast(Student.__table__.c.data_test["foo"],
String) =="bar").**first**()*
*error*:
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) operator does
not exist: json -> unknown
LINE 3: WHERE CAST((students.data_test -> 'foo') AS VARCHAR) = 'bar'
^
HINT: No operator matches the given name and argument type(s). You might
need to add explicit type casts.
[SQL: 'SELECT students.id AS students_id, students.name AS students_name,
students.roll_no AS students_roll_no, students.data_test AS
students_data_test \nFROM students \nWHERE CAST((students.data_test ->
%(data_test_1)s) AS VARCHAR) = %(param_1)s'] [parameters: {'param_1':
'bar', 'data_test_1': 'foo'}]
tried this:
*a = Student.query.filter(Student.data_test.op('->>')('foo') ==
'bar').first()*
*error*:
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) operator does
not exist: json ->> unknown
LINE 3: WHERE (students.data_test ->> 'foo') = 'bar'
^
HINT: No operator matches the given name and argument type(s). You might
need to add explicit type casts.
[SQL: 'SELECT students.id AS students_id, students.name AS students_name,
students.roll_no AS students_roll_no, students.data_test AS
students_data_test \nFROM students \nWHERE (students.data_test ->>
%(data_test_1)s) = %(param_1)s \n LIMIT %(param_2)s'] [parameters:
{'param_1': 'bar', 'data_test_1': 'foo', 'param_2': 1}]
is this some versioning issue?
I am not able to understand, where am i going wrong?
Thanks for any help in this
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