Query with paging by cursor causes error because of limitations for “IN filter” in cursor() method… What should be the alternative?

Question

I am developing a twitter like microblogging system by using the following models:

class Member(db.Model):    
    user = db.UserProperty(required=True)
             


        

Answer 1

A quick and nasty way...

Download this pagintor.py import it into your project.

Then you can do something like this for pagination

    from paginator import Paginator, InvalidPage, EmptyPage
     model = Member.all().fetch(100)
     paginator = Paginator(model,5)

                if(self.request.GET):
                    page = int(self.request.GET.get('page', '1'))
                    if(page is not None):
                        try:
                            page = int(self.request.GET.get('page', '1'))
                        except ValueError:
                            page = 1

                        # If page request (9999) is out of range, deliver last page of results.
                        try:
                            paginator = paginator.page(page)
                        except (EmptyPage, InvalidPage):
                            paginator = paginator.page(paginator.num_pages)
    return self.response.out.write( template.render(path+'.html',{'paginator':paginator}))


#In templates

{% if paginator.object_list %}

{% for values in paginator.object_list %}

#do your tasks

{% endfor %}

        {% if paginator.has_previous %}
            Previous
        {% else %}
         
            Previous
        
        {% endif %}

        
               Page {{ paginator.number }} of {{paginator.paginator.num_pages }}   
        

        {% if paginator.has_next %}
             Next 
            {% else %}
         
            Next 
        
        {% endif %}

on click of next or previous , take the href val() and pass to the url as get variable like http://someurl?page=.

more reference here