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Handle doing a paginated query on ordered_by results

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Signed-off-by: Thomas Citharel <tcit@tcit.fr>
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Thomas Citharel 2020-12-09 17:56:19 +01:00
parent 8ebef3296b
commit 848c18470c
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1 changed files with 6 additions and 3 deletions
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9
lib/mobilizon/storage/page.ex
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@ -19,12 +19,15 @@ defmodule Mobilizon.Storage.Page do
@doc """ @doc """
Returns a Page struct for a query. Returns a Page struct for a query.
`field` is use to define the field that will be used for the count aggregate, which should be the same as the field used for order_by
See https://stackoverflow.com/q/12693089/10204399
""" """
@spec build_page(Ecto.Query.t(), integer | nil, integer | nil) :: t @spec build_page(Ecto.Query.t(), integer | nil, integer | nil, atom()) :: t
def build_page(query, page, limit) do def build_page(query, page, limit, field \\ :id) do
[total, elements] = [total, elements] =
[ [
fn -> Repo.aggregate(query, :count, :id) end, fn -> Repo.aggregate(query, :count, field) end,
fn -> Repo.all(paginate(query, page, limit)) end fn -> Repo.all(paginate(query, page, limit)) end
] ]
|> Enum.map(&Task.async/1) |> Enum.map(&Task.async/1)