I have problem with pagination. If i try this with just a list of dict it works ok, problem starts when i try use model from my DB.I have about 10k users in my sql alchemy database. User is dbModel:
class UserModel(db.Model):
__tablename__ = 'users'
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(120), unique=True, nullable=False)
password = db.Column(db.String(120), nullable=False)
I want to show users from 1 to 100, from 100 to 200 etc. I'm trying to use this tutorial : https://aviaryan.com/blog/gsoc/paginated-apis-flask
Here is classmethod to return model into dict:
@classmethod
def return_all(cls):
def to_json(x):
return {
'id': x.id,
'username': x.username,
'password': x.password
}
return {'users': list(map(lambda x: to_json(x), UserModel.query.all()))}
Here is the pagination def:
def get_paginated_list(klass, url, start, limit):
start = int(start)
limit = int(limit)
# check if page exists
results = klass.return_all()
count = (len(results))
if count < start or limit < 0:
abort(404)
# make response
obj = {}
obj['start'] = start
obj['limit'] = limit
obj['count'] = count
# make URLs
# make previous url
if start == 1:
obj['previous'] = ''
else:
start_copy = max(1, start - limit)
limit_copy = start - 1
obj['previous'] = url + '?start=%d&limit=%d' % (start_copy, limit_copy)
# make next url
if start + limit > count:
obj['next'] = ''
else:
start_copy = start + limit
obj['next'] = url + '?start=%d&limit=%d' % (start_copy, limit)
# finally extract result according to bounds
obj['results'] = results[(start - 1):(start - 1 + limit)]
return obj
My api resource code is:
class AllUsers(Resource):
def get(self):
jsonify(get_paginated_list(
UserModel,
'users/page',
start=request.args.get('start', 1),
limit=request.args.get('limit', 100)
))
The problem i get is when i try get users from link http://127.0.0.1:5000/users/page?start=1&limit=100
TypeError: unhashable type: 'slice'
How to solve this thing? Or how can i show results as i want?
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