ERROR: ArgumentError: System rc_model: variable resistor₊v does not exist

[zsoerenm]

Describe the bug 🐞

If you follow this tutorial: https://docs.sciml.ai/ModelingToolkitStandardLibrary/stable/tutorials/rc_circuit/
and if you try to access one of the properties

julia> sys.resistor₊v

You'll get this error:

ERROR: ArgumentError: System rc_model: variable resistor₊v does not exist
Stacktrace:
 [1] getvar(sys::ODESystem, name::Symbol; namespace::Bool)
   @ ModelingToolkit ~/.julia/packages/ModelingToolkit/66mEN/src/systems/abstractsystem.jl:363
 [2] getproperty(sys::ODESystem, name::Symbol; namespace::Bool)
   @ ModelingToolkit ~/.julia/packages/ModelingToolkit/66mEN/src/systems/abstractsystem.jl:314
 [3] getproperty(sys::ODESystem, name::Symbol)
   @ ModelingToolkit ~/.julia/packages/ModelingToolkit/66mEN/src/systems/abstractsystem.jl:310
 [4] top-level scope
   @ REPL[18]:1

This happens with the latest MTK v8.73.1

I doesn't happen with MTK v8.70.0

Expected behavior

julia> sys.resistor₊v

Should return the symbol.

Environment (please complete the following information):

Status `~/.julia/environments/v1.9/Project.toml`
⌃ [f68482b8] Cthulhu v2.9.4
⌃ [e9467ef8] GLMakie v0.8.11
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  [16a59e39] ModelingToolkitStandardLibrary v2.3.4
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  [e49d8811] ReactiveGraphs v0.1.1
⌃ [295af30f] Revise v3.5.7
  [df971d30] Rocket v1.7.2
Info Packages marked with ⌃ have new versions available and may be upgradable.

• Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)

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  [bea87d4a] SuiteSparse_jll v5.10.1+6
  [83775a58] Zlib_jll v1.2.13+0
  [8e850b90] libblastrampoline_jll v5.8.0+0
  [8e850ede] nghttp2_jll v1.52.0+1
  [3f19e933] p7zip_jll v17.4.0+0

• Output of versioninfo()

Julia Version 1.9.4
Commit 8e5136fa297 (2023-11-14 08:46 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 16 × AMD Ryzen 7 PRO 5850U with Radeon Graphics
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, znver3)
  Threads: 1 on 16 virtual cores
Environment:
  JULIA_PKG_SERVER = internal.juliahub.com
  JULIA_IMAGE_THREADS = 1

[ChrisRackauckas]

It looks like it's because that doc is old. If you used the @mtkmodel and @mtkbuild form, you should complete the system and it will just work. Can you confirm?

[zsoerenm]

Yes, using complete and dot notation works:

julia> sys_completed = complete(sys)
julia> sys_completed.resistor.v
resistor₊v(t)

But it isn't suggested by tab complete:

julia> sys_completed.<tab complete>
capacitor₊C        capacitor₊i        capacitor₊n₊i      capacitor₊n₊v      capacitor₊p₊i      capacitor₊p₊v      capacitor₊v        constant₊k         constant₊output₊u  ground₊g₊i         ground₊g₊v         resistor₊R         resistor₊i         resistor₊n₊i       resistor₊n₊v       resistor₊p₊i
resistor₊p₊v       resistor₊v         source₊V₊u         source₊i           source₊n₊i         source₊n₊v         source₊p₊i         source₊p₊v         source₊v

[ChrisRackauckas]

This is fixed in MTK v9 which now requires complete models.