Current section
Files
Jump to
Current section
Files
lib/exhal/collection.ex
defmodule ExHal.Collection do
@moduledoc """
Utility functions for dealing with RFC 6473 collections
"""
alias ExHal.Document
alias ExHal.ResponseHeader
@doc """
Returns a stream that iterate over the collection represented by `a_doc`.
"""
def to_stream(a_doc) do
Stream.resource(
fn -> {:ok, a_doc} end,
fn follow_result ->
case follow_result do
{:error, _} -> {:halt, follow_result}
{:ok, page} -> page |> expand_page
{:ok, page, %ResponseHeader{}} -> page |> expand_page
end
end,
fn _ -> nil end
)
end
@doc """
Returns a string representation of this HAL collection.
"""
def render!(enum) do
to_json_hash(enum)
|> Poison.encode!()
end
@doc """
** Deprecated **
see `render/1`
"""
def to_json_hash(enum) do
%{"_embedded" => %{"item" => Enum.map(enum, &Document.to_json_hash(&1))}}
end
defp expand_page(page) do
{ExHal.follow_links(page, "item", fn _ -> [] end),
ExHal.follow_link(page, "next", pick_volunteer: true)}
end
end