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# frozen_string_literal: true
require "spec_helper"
describe "GraphQL::Relay::PageInfo" do
def get_page_info(result)
result["data"]["empire"]["bases"]["pageInfo"]
end
def get_first_cursor(result)
result["data"]["empire"]["bases"]["edges"].first["cursor"]
end
def get_last_cursor(result)
result["data"]["empire"]["bases"]["edges"].last["cursor"]
end
let(:cursor_of_last_base) {
result = star_wars_query(query_string, { "first" => 100 })
get_last_cursor(result)
}
let(:query_string) {%|
query getShips($first: Int, $after: String, $last: Int, $before: String, $nameIncludes: String){
empire {
bases(first: $first, after: $after, last: $last, before: $before, nameIncludes: $nameIncludes) {
pageInfo {
hasNextPage
hasPreviousPage
startCursor
endCursor
},
edges {
cursor
}
}
}
}
|}
describe 'hasNextPage / hasPreviousPage' do
it "hasNextPage is true if there are more items" do
result = star_wars_query(query_string, { "first" => 2 })
assert_equal(true, get_page_info(result)["hasNextPage"])
assert_equal(false, get_page_info(result)["hasPreviousPage"], "hasPreviousPage is false if 'last' is missing")
assert_equal("MQ", get_page_info(result)["startCursor"])
assert_equal("Mg", get_page_info(result)["endCursor"])
last_cursor = get_last_cursor(result)
result = star_wars_query(query_string, { "first" => 100, "after" => last_cursor })
assert_equal(false, get_page_info(result)["hasNextPage"])
assert_equal(true, get_page_info(result)["hasPreviousPage"])
assert_equal("Mw", get_page_info(result)["startCursor"])
assert_equal("Mw", get_page_info(result)["endCursor"])
end
it "hasPreviousPage if there are more items" do
result = star_wars_query(query_string, { "last" => 100, "before" => cursor_of_last_base })
assert_equal(true, get_page_info(result)["hasNextPage"])
assert_equal(false, get_page_info(result)["hasPreviousPage"])
assert_equal("MQ", get_page_info(result)["startCursor"])
assert_equal("Mg", get_page_info(result)["endCursor"])
result = star_wars_query(query_string, { "last" => 1, "before" => cursor_of_last_base })
assert_equal(true, get_page_info(result)["hasNextPage"])
assert_equal(true, get_page_info(result)["hasPreviousPage"])
assert_equal("Mg", get_page_info(result)["startCursor"])
assert_equal("Mg", get_page_info(result)["endCursor"])
end
it "has both if first and last are present" do
result = star_wars_query(query_string, { "last" => 1, "first" => 1, "before" => cursor_of_last_base })
assert_equal(true, get_page_info(result)["hasNextPage"])
# I think this was actually a bug in the previous implementation.
# This query returns the first node in the list:
# Base64.decode64("MQ") # => "1"
# So, there is _not_ a previous page.
assert_equal(false, get_page_info(result)["hasPreviousPage"])
assert_equal("MQ", get_page_info(result)["startCursor"])
assert_equal("MQ", get_page_info(result)["endCursor"])
end
it "startCursor and endCursor are the cursors of the first and last edge" do
result = star_wars_query(query_string, { "first" => 2 })
assert_equal(true, get_page_info(result)["hasNextPage"])
assert_equal(false, get_page_info(result)["hasPreviousPage"])
assert_equal("MQ", get_page_info(result)["startCursor"])
assert_equal("Mg", get_page_info(result)["endCursor"])
assert_equal("MQ", get_first_cursor(result))
assert_equal("Mg", get_last_cursor(result))
result = star_wars_query(query_string, { "first" => 1, "after" => get_page_info(result)["endCursor"] })
assert_equal(false, get_page_info(result)["hasNextPage"])
assert_equal(true, get_page_info(result)["hasPreviousPage"])
assert_equal("Mw", get_page_info(result)["startCursor"])
assert_equal("Mw", get_page_info(result)["endCursor"])
assert_equal("Mw", get_first_cursor(result))
assert_equal("Mw", get_last_cursor(result))
result = star_wars_query(query_string, { "last" => 1, "before" => get_page_info(result)["endCursor"] })
assert_equal(true, get_page_info(result)["hasNextPage"])
assert_equal(true, get_page_info(result)["hasPreviousPage"])
assert_equal("Mg", get_page_info(result)["startCursor"])
assert_equal("Mg", get_page_info(result)["endCursor"])
assert_equal("Mg", get_first_cursor(result))
assert_equal("Mg", get_last_cursor(result))
end
end
it "can be redefined" do
conn_type = Class.new(GraphQL::Schema::Object) do
include GraphQL::Types::Relay::ConnectionBehaviors
get_field("pageInfo").type = GraphQL::Types::Int.to_non_null_type
end
assert_equal "Int!", conn_type.fields["pageInfo"].type.to_type_signature
# The original is unchanged:
assert_equal "PageInfo!", GraphQL::Types::Relay::BaseConnection.fields["pageInfo"].type.to_type_signature
end
end
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