Updating same hash in iterator each loop in ruby - ruby

Question

Updated with getEntitlementList() method
I am new to ruby and trying to update hash with data getting in steps.
Short story: I got my other problem solved and it was on this:
[1]: split and loop in Ruby
It has 2 problems:
Even though I am setting offset step wise by 250, it is returning the same response. For ex: offset=0. offset=250, offset=500 till offset=3000. It is returning same response not different.
On every new offset, I want to update the same hash so that in the end I will have hash for all items.
API Doc says:
limit >> Integer that specifies the maximum number of records to return in a single API call. If not specified a default limit will be used. Maxiumum of 250 records per page
2.offset >> Integer that specifies the offset of the first result
from the beginning of the collection. offset is record based,
not page based, and the index starts at 0.
For example, offset=0 and limit=20 will return records 0-19, while offset=1 and limit=20 will return records 1-20. Between 0 and the last record index.
def getEntitlementList(url,header,source,limit,offset)
# This method pulls list of existing entitlements of a given source
# This list is uses to create a hsh Map of displayableName vs Id
# Returns a hash Map
uri = URI.parse( "#{url}/cc/api/entitlement/list?limit=#{limit}&offset=#{offset}&CISApplicationId=#{source}" )
puts uri
http = Net::HTTP.new( uri.host, uri.port )
http.use_ssl = true
request = Net::HTTP::Get.new( uri.request_uri, header )
# puts "request : #{request}"
response = http.request( request )
# puts "entitlements hash map : #{response}"
# puts "#{JSON.parse(response.body)}"
case response
when Net::HTTPSuccess
responseBody = JSON.parse(response.body)
# puts responseBody
when Net::HTTPUnauthorized
puts "#{source} Entitlements Hash Map creation is a Failure!"
puts "Error: Unauthorized."
when Net::HTTPServerError
puts "#{source} Entitlements Hash Map creation is a Failure!"
puts "Error: Server Error."
else
puts "#{source} Entitlements Hash Map creation is a Failure!"
puts "Error: #{response.code}"
end
return responseBody
end
What I want to achieve is, I have below code:
limit = 250
entitlementHash = Hash.new
(0..3000).step(250) do |offset|
responseBody = getEntitlementList(url,header,source,limit,offset)
count = responseBody['count']
entitlementList = responseBody['items']
entitlementList.each {|a| entitlementHash["#{a['displayableName'].upcase()}"] =
a['id']}
puts "updated entitlementHash size: #{entitlementHash.size}"
end
return entitlementHash
My api has 3000 data items but in each run it pulls only 250.
So every time it pulls the data, I would like to update the entitlementHash with newer data.
So that at the end of last run, my entitlementHash will have all 3000 data items.
Currently it is just taking last 250 items.
I tried with below:
entitlementHash.update
entitlementHash.store
entitlementHash.merge
but didn't work.
Any help would be really grateful.