Recording data from model_step in Agents.jl

Specific Domains Modelling & Simulations
1

Hi, I am trying to increment a few pieces of data on every model step in Agents.jl. Data are structured as Dict entries. The code appears to be incrementing appropriately when I examine the values from within model_step! using @infiltrate.

However, the corresponding variable in the model dataframe is constant for each time step.

I’ve replicated this issue by adding a couple of snippets to the Schelling model. Any suggestions on how to recover the appropriate values at each time step? Thanks!

Here is the code:

function model_step!(model)
    model.foo["baz"] += 1 
    model.foo["bar"] += 5 
end 

@kwdef mutable struct Parameters
    min_to_be_happy::Int = 3
    foo::Dict{String,Int16}  = Dict("baz" => 0, "bar" => 0) 
end

And the output from mdf

0 Dict{String, Int16}(“bar”=>25, "…
1 Dict{String, Int16}(“bar”=>25, "…
2 Dict{String, Int16}(“bar”=>25, "…
3 Dict{String, Int16}(“bar”=>25, "…
4 Dict{String, Int16}(“bar”=>25, "…
5 Dict{String, Int16}(“bar”=>25, "…