ACSetTransformation mapping attributes to nothing in StockFlow.jl no longer works after upgrading to Catlab 15

[neonWhiteout]

@kris-brown

Previously, we mapped attributes in an ACSetTransformation to nothing to create a natural transformation for a pullback, of the form Position = x -> nothing. A particular example can be see in cell 11 here.

This no longer works for version 15 of Catlab.

Will check typed_product in algebraic petri to see if it can be used for this.

[neonWhiteout]

typed_WeightModel=ACSetTransformation(WeightModel, l_type,
  S = [s,s,s],
  SV = [N],
  LS = [lsn,lsn,lsn],   
  F = [f_birth, f_death, f_fstorder, f_death, f_fstorder, f_death, f_aging, f_aging, f_aging],    
  I = [i_birth, i_aging, i_fstorder, i_aging, i_fstorder, i_aging], 
  O = [o_death, o_fstorder, o_aging, o_death, o_fstorder, o_aging, o_death, o_aging],
  V = [v_birth, v_death, v_fstorder, v_death, v_fstorder, v_death, v_aging, v_aging, v_aging],
  LV = [lv_death1, lv_fstorder1, lv_death1, lv_fstorder1, lv_death1, lv_aging1, lv_aging1, lv_aging1],
  LSV = [lsv_birth1],
  P = [p_μ, p_δ, p_rfstOrder, p_rfstOrder, p_δ, p_rage],
  LPV = [lpv_birth2, lpv_death2, lpv_fstorder2, lpv_death2, lpv_fstorder2, lpv_death2, lpv_aging2, lpv_aging2, lpv_aging2],
  Name = name -> nothing, Op=op->nothing, Position=pos->nothing
);

MethodError: no method matching coerce_attrvar_component(::Symbol, ::var"#46#49", ::TypeSet{Symbol}, ::TypeSet{Nothing}, ::Int64, ::Int64)

Closest candidates are:
  coerce_attrvar_component(::Symbol, !Matched::LooseVarFunction, ::TypeSet{T}, ::TypeSet{T′}, ::Int64, ::Int64) where {T, T′}
   @ Catlab [~/.julia/packages/Catlab/olyoH/src/categorical_algebra/CSets.jl:436](https://file+.vscode-resource.vscode-cdn.net/home/silicon/Documents/Git/StockFlow.jl/examples/full_fledged_schema_examples_new/stratification/~/.julia/packages/Catlab/olyoH/src/categorical_algebra/CSets.jl:436)
  coerce_attrvar_component(::Symbol, !Matched::AbstractVector, ::TypeSet{T}, !Matched::TypeSet{T}, ::Int64, ::Int64) where T
   @ Catlab [~/.julia/packages/Catlab/olyoH/src/categorical_algebra/CSets.jl:420](https://file+.vscode-resource.vscode-cdn.net/home/silicon/Documents/Git/StockFlow.jl/examples/full_fledged_schema_examples_new/stratification/~/.julia/packages/Catlab/olyoH/src/categorical_algebra/CSets.jl:420)
  coerce_attrvar_component(::Symbol, !Matched::VarFunction, ::TypeSet{T}, !Matched::TypeSet{T}, ::Int64, ::Int64) where T
   @ Catlab [~/.julia/packages/Catlab/olyoH/src/categorical_algebra/CSets.jl:428](https://file+.vscode-resource.vscode-cdn.net/home/silicon/Documents/Git/StockFlow.jl/examples/full_fledged_schema_examples_new/stratification/~/.julia/packages/Catlab/olyoH/src/categorical_algebra/CSets.jl:428)

[kris-brown]

Hi, this is a bug that should be quickly addressed - looks like we just need to add another method for coerce_attrvar_component. Thanks for pointing this out!

[epatters]

@neonWhiteout, if #839 fixes your problems, I can tag a new patch release.

[neonWhiteout]

@neonWhiteout, if #839 fixes your problems, I can tag a new patch release.

@epatters Yes, seems to be working, thank you!