Simple Sinatra Pagination - ruby

Question

I am working with an API and I am trying to develop a simple pagination from scratch in Sinatra
This is my Sinatra route - it performs the API Call and returns 25 matters with the limit: 25 parameter and stores the resulting array in #matter -
get '/matters' do
#matter = client.matters.list(limit: 25)
slim :matters
end
My plan to get additional matters is
get '/next_matters' do
#matter = client.matters.next_page
slim :matters
end
Which supposedly returns the next 25 matters
This is my slim code at the bottom of the list of matters:
a href= "/next_matters" Next
This does not work - It returns nothing - I am sure this is because when I call next_matters is does not remember the state from client.matters.list(limit: 25).
Do I need a helper method for this?
When I try:
get '/matters' do
#matter = client.matters.list(limit: 25)
#matter2 = client.matters.next_page
slim :matters
end
I can list 50 matters - some how I need to pass the fact that I have called list previously
How do I do this?

Answer 1

You would do this by passing in an offset to the database as part of the query.
i.e.:
SELECT * FROM matters LIMIT 25;
Then on requesting the next page, you would do:
SELECT * FROM matters LIMIT 25 OFFSET 25;
Therefore, the next_page method needs to accept at least 1 parameter; an offset.
Pseudo code:
def next_page(offset)
# first page offset would be 0
# second page offset would be 25
# ...
limit(25).offset(offset)
end