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Versions: 18
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Contents
module GraphQL
module Relay
class ArrayConnection < BaseConnection
# Just to encode data in the cursor, use something that won't conflict
CURSOR_SEPARATOR = "---"
def cursor_from_node(item)
idx = sliced_nodes.find_index(item)
cursor_parts = [(order || "none"), idx]
Base64.strict_encode64(cursor_parts.join(CURSOR_SEPARATOR))
end
private
# apply first / last limit results
def paged_nodes
@paged_nodes = begin
items = sliced_nodes
first && items = items.first(first)
last && items.length > last && items.last(last)
items
end
end
# Apply cursors to edges
def sliced_nodes
@sliced_nodes ||= begin
items = object
if order
# Remove possible direction marker:
order_name = order.sub(/^-/, '')
items = items.sort_by { |item| item.public_send(order_name) }
order.start_with?("-") && items = items.reverse
end
after && items = items[(1 + index_from_cursor(after))..-1]
before && items = items[0..(index_from_cursor(before) - 1)]
items
end
end
def index_from_cursor(cursor)
decoded = Base64.decode64(cursor)
order, index = decoded.split(CURSOR_SEPARATOR)
index.to_i
end
end
BaseConnection.register_connection_implementation(Array, ArrayConnection)
end
end
Version data entries
18 entries across 18 versions & 1 rubygems