![Screenshot of the following Elixir code:
data = %{"items" => [%{"id" => 1}, %{"id" => 2}]}
path = ["items", Access.filter(& &1["id"] == 2), "name"]
put_in(data, path, "Item #2")
# =>
# %{"items" => [
# %{"id" => 1},
# %{"id" => 2, "name" => "Item #2"}
# ]}](https://pbs.twimg.com/media/FsYJwz9XwAMs9bs.jpg?name=orig)
ALT Screenshot of the following Elixir code: data = %{"items" => [%{"id" => 1}, %{"id" => 2}]} path = ["items", Access.filter(& &1["id"] == 2), "name"] put_in(data, path, "Item #2") # => # %{"items" => [ # %{"id" => 1}, # %{"id" => 2, "name" => "Item #2"} # ]}
![Image with the following code:
fetch_ops = fn repo, _ ->
case repo.get(Model, id) do
nil -> {:ok, []}
value -> {:ok, value.ops}
end
end
reduce_ops = fn _, %{fetched_ops: fetched_ops} ->
{:ok, Delta.compose(fetched_ops, ops)}
end
set_ops = fn repo, %{reduced_ops: reduced_ops} ->
repo.insert(
Model.changeset(%Model{}, %{id: id, ops: reduced_ops}),
on_conflict: [set: [ops: reduced_ops]],
conflict_target: :id
)
end
Multi.new()
|> Multi.run(:fetched_ops, &fetch_ops/2)
|> Multi.run(:reduced_ops, &reduce_ops/2)
|> Multi.run(:set_ops, &set_ops/2)
|> Repo.transaction()](https://pbs.twimg.com/media/FHF_TMuWUAkB7bR.jpg?name=orig)
ALT Image with the following code: fetch_ops = fn repo, _ -> case repo.get(Model, id) do nil -> {:ok, []} value -> {:ok, value.ops} end end reduce_ops = fn _, %{fetched_ops: fetched_ops} -> {:ok, Delta.compose(fetched_ops, ops)} end set_ops = fn repo, %{reduced_ops: reduced_ops} -> repo.insert( Model.changeset(%Model{}, %{id: id, ops: reduced_ops}), on_conflict: [set: [ops: reduced_ops]], conflict_target: :id ) end Multi.new() |> Multi.run(:fetched_ops, &fetch_ops/2) |> Multi.run(:reduced_ops, &reduce_ops/2) |> Multi.run(:set_ops, &set_ops/2) |> Repo.transaction()
