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|
# frozen_string_literal: true
require "graphql/pagination/connection"
module GraphQL
module Pagination
class ArrayConnection < Pagination::Connection
def nodes
load_nodes
@nodes
end
def has_previous_page
load_nodes
@has_previous_page
end
def has_next_page
load_nodes
@has_next_page
end
def cursor_for(item)
idx = items.find_index(item) + 1
encode(idx.to_s)
end
private
def index_from_cursor(cursor)
decode(cursor).to_i
end
# Populate all the pagination info _once_,
# It doesn't do anything on subsequent calls.
def load_nodes
@nodes ||= begin
sliced_nodes = if before && after
end_idx = index_from_cursor(before) - 2
end_idx < 0 ? [] : items[index_from_cursor(after)..end_idx] || []
elsif before
end_idx = index_from_cursor(before) - 2
end_idx < 0 ? [] : items[0..end_idx] || []
elsif after
items[index_from_cursor(after)..-1] || []
else
items
end
@has_previous_page = if last
# There are items preceding the ones in this result
sliced_nodes.count > last
elsif after
# We've paginated into the Array a bit, there are some behind us
index_from_cursor(after) > 0
else
false
end
@has_next_page = if before
# The original array is longer than the `before` index
index_from_cursor(before) < items.length + 1
elsif first
# There are more items after these items
sliced_nodes.count > first
else
false
end
limited_nodes = sliced_nodes
limited_nodes = limited_nodes.first(first) if first
limited_nodes = limited_nodes.last(last) if last
limited_nodes
end
end
end
end
end
|
