Q1 - I am working with multiple dataframes and trying to create structure with dataframes in it so that they can be accessed easily. I’ve created struct like below and when I try to assign the data to it I got an error “setfield! fields of Types should not be changed” despite of defining mutable struct. I’ve also tried using macro @set from Setfield package.
mutable struct all_dataframes1 map_df::DataFrame code_df::DataFrame end s = @set all_dataframes.map_df = df ERROR: UndefRefError: access to undefined reference Stacktrace:  getproperty @ .\Base.jl:37 [inlined]  _broadcast_getindex_evalf Q2 - I am trying to store multiple database connections (eg. MYSQL and PostgreSQL) in connection pool so that I can access at any point in my code. I've seen there is connectionpool.jl that has been created for Redis but haven't found in packages registry.