paginator for objects, add page parameter in url, json response

paginator sample

# paginator objects and page parameter in url

from django.http import HttpResponse
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
import json


AMOUNT_PER_PAGE = 10

def someview(request):

    data = request.GET
    page = data.get('page', None)
    amount_per_page = data.get('amount_per_page', str(AMOUNT_PER_PAGE))

    try:
        page = int(page)
    except:
        page = 1

    query_objects = SomeModel.objects.all()

    paginator = Paginator(query_objects, amount_per_page)
    total_count = paginator.count           # total records
    pages_count = paginator.num_pages       # total pages
    page = paginator.num_pages if page > paginator.num_pages else page

    try:
        objects = paginator.page(page)
    except PageNotAnInteger:
        page = 1
        objects = paginator.page(page)
    except EmptyPage:
        objects = paginator.page(paginator.num_pages)

    # url params
    params = ''
    data_tmp = data.copy()
    if 'page' in data_tmp:
        del data_tmp['page']
    params = '&'.join(['%s=%s' % (param, data_tmp[param]) for param in data_tmp])

    params = '?page=' if params == '' else '?%s%s' % (params, '&page=')

    url = '%s://%s%s%s' % ('http' if settings.DEBUG else 'https', request.get_host(), request.path_info, params)

    pages_data = {
        'total_pages': paginator.num_pages,
        'total_records': paginator.count,
        'next': ('%s%s' % (url, objects.next_page_number())) if objects.has_next() else '',
        'prev': ('%s%s' % (url, objects.previous_page_number())) if objects.has_previous() else '',
    }

    result = {
        'pages_data': pages_data,
        'success': True if  else False,
        'items': [x for x in query_objects],
        'msg': 'success' if query_objects else 'no data',
    }

    return HttpResponse(json.dumps(result), content_type='application/json; charset="utf-8"')