Sha256: 7e96c5342069db162c985dc1eae5bb80d3f4f61abb3abf634bd3da290bcb885c
Contents?: true
Size: 1.7 KB
Versions: 29
Compression:
Stored size: 1.7 KB
Contents
module GraphQL
module Relay
class ArrayConnection < BaseConnection
def cursor_from_node(item)
idx = starting_offset + sliced_nodes.find_index(item) + 1
Base64.strict_encode64(idx.to_s)
end
def has_next_page
!!(first && sliced_nodes.count > limit)
end
def has_previous_page
!!(last && starting_offset > 0)
end
private
# apply first / last limit results
def paged_nodes
@paged_nodes ||= begin
items = sliced_nodes
if limit
items.first(limit)
else
items
end
end
end
# Apply cursors to edges
def sliced_nodes
@sliced_nodes ||= nodes[starting_offset..-1]
end
def index_from_cursor(cursor)
Base64.decode64(cursor).to_i
end
def starting_offset
@starting_offset = if before
[previous_offset, 0].max
else
previous_offset
end
end
def previous_offset
@previous_offset ||= if after
index_from_cursor(after)
elsif before
prev_page_size = [max_page_size, last].compact.min || 0
index_from_cursor(before) - prev_page_size - 1
else
0
end
end
def limit
@limit ||= begin
limit_from_arguments = if first
first
else
if previous_offset < 0
previous_offset + (last ? last : 0)
else
last
end
end
[limit_from_arguments, max_page_size].compact.min
end
end
end
BaseConnection.register_connection_implementation(Array, ArrayConnection)
end
end
Version data entries
29 entries across 29 versions & 1 rubygems