proper way to modify data in a model via uploader methods?

[honghuzi]

Hi, I am now working on a dashboard app with Stipple.jl. I start my project by modifying the IrisCluster demo step by step. I am now struggling on the data uploading features.
I defined a model containing :data attributes like this

@reactive mutable struct MyModel <: ReactiveModel
     data::R{DataFrame} = DataFrame("x" => [0.0, 1000.0], "y" => [0.0, 1000.0])
end
route("/") do
    MyModel |> init |> ui |> html
end

then I want to modify the :data field of above created model with the uploaded file, just like this

route("/upload_data", method=POST) do
    files = Genie.Requests.filespayload()
    data = XLSX.readtable(files[1][2])
    # modify mymodel.data with data
end

I have two ways achieving this goal

• defining a global variable mymodel and initialize it at the global view, so that "/" and "/upload_data" just modify the same model
• in the "/upload_data" method, write the data to a temp file in on the server side, then create a btn in the main page to modify the model :data with the temp file.
  These two methods are both unsafe for the multi-user case. Is there any better way to accomplish similar task?