Advanced Example: The FrankenStruct in the documentation throws an error #410
Description
I tried Advanced Example: The FrankenStruct, but it throws the following ArgumentError. Is there any way to resolve the error?
(@v1.12) pkg> activate --temp
Activating new project at `/tmp/jl_Ab9Wkw`
(jl_Ab9Wkw) pkg> dev JSON
Resolving package versions...
Updating `/tmp/jl_Ab9Wkw/Project.toml`
[682c06a0] + JSON v1.3.0 `~/.julia/dev/JSON`
Updating `/tmp/jl_Ab9Wkw/Manifest.toml`
[682c06a0] + JSON v1.3.0 `~/.julia/dev/JSON`
[69de0a69] + Parsers v2.8.3
[aea7be01] + PrecompileTools v1.3.3
[21216c6a] + Preferences v1.5.0
[ec057cc2] + StructUtils v2.6.0
[ade2ca70] + Dates v1.11.0
[56ddb016] + Logging v1.11.0
[de0858da] + Printf v1.11.0
[9a3f8284] + Random v1.11.0
[ea8e919c] + SHA v0.7.0
[fa267f1f] + TOML v1.0.3
[cf7118a7] + UUIDs v1.11.0
[4ec0a83e] + Unicode v1.11.0
(jl_Ab9Wkw) pkg> add StructUtils
Resolving package versions...
Updating `/tmp/jl_Ab9Wkw/Project.toml`
[ec057cc2] + StructUtils v2.6.0
Manifest No packages added to or removed from `/tmp/jl_Ab9Wkw/Manifest.toml`
Precompiling packages finished.
5 dependencies successfully precompiled in 14 seconds. 6 already precompiled.
julia> using Dates, JSON, StructUtils
julia> # First, define some types for polymorphic parsing
abstract type AbstractMonster end
julia> struct Dracula <: AbstractMonster
num_victims::Int
end
julia> struct Werewolf <: AbstractMonster
witching_hour::DateTime
end
julia> # Define a custom type chooser for AbstractMonster
JSON.@choosetype AbstractMonster x -> x.monster_type[] == "vampire" ? Dracula : Werewolf
julia> # Define a custom numeric type with special parsing
struct Percent <: Number
value::Float64
end
julia> # Custom lifting for the Percent type
JSON.lift(::Type{Percent}, x) = Percent(Float64(x))
julia> StructUtils.liftkey(::Type{Percent}, x::String) = Percent(parse(Float64, x))
julia> # Our complex struct with various field types and defaults
@defaults struct FrankenStruct
id::Int = 0
name::String = "Jim"
address::Union{Nothing, String} = nothing
rate::Union{Missing, Float64} = missing
type::Symbol = :a &(json=(name="franken_type",),)
notsure::Any = nothing
monster::AbstractMonster = Dracula(0)
percent::Percent = Percent(0.0)
birthdate::Date = Date(0) &(json=(dateformat="yyyy/mm/dd",),)
percentages::Dict{Percent, Int} = Dict{Percent, Int}()
json_properties::JSONText = JSONText("")
matrix::Matrix{Float64} = Matrix{Float64}(undef, 0, 0)
end
fieldtags (generic function with 3 methods)
julia> # A complex JSON input with various features to demonstrate
json = """
{
"id": 1,
"address": "123 Main St",
"rate": null,
"franken_type": "b",
"notsure": {"key": "value"},
"monster": {
"monster_type": "vampire",
"num_victims": 10
},
"percent": 0.1,
"birthdate": "2023/10/01",
"percentages": {
"0.1": 1,
"0.2": 2
},
"json_properties": {"key": "value"},
"matrix": [[1.0, 2.0], [3.0, 4.0]],
"extra_key": "extra_value"
}
"""
"{\n \"id\": 1,\n \"address\": \"123 Main St\",\n \"rate\": null,\n \"franken_type\": \"b\",\n \"notsure\": {\"key\": \"value\"},\n \"monster\": {\n \"monster_type\": \"vampire\",\n \"num_victims\": 10\n },\n \"percent\": 0.1,\n \"birthdate\": \"2023/10/01\",\n \"percentages\": {\n \"0.1\": 1,\n \"0.2\": 2\n },\n \"json_properties\": {\"key\": \"value\"},\n \"matrix\": [[1.0, 2.0], [3.0, 4.0]],\n \"extra_key\": \"extra_value\"\n}\n"
julia> franken = JSON.parse(json, FrankenStruct)
ERROR: ArgumentError: applyeach not applicable for `JSON.LazyValue{String}` with JSON type = `JSONTypes.NUMBER`
Stacktrace:
[1] applyeach
@ ~/.julia/dev/JSON/src/lazy.jl:186 [inlined]
[2] makestruct(style::JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, ::Type{Percent}, source::JSON.LazyValue{String})
@ StructUtils ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:984
[3] make(style::JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, T::Type, source::JSON.LazyValue{String})
@ StructUtils ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:795
[4] make(style::JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, T::Type, source::JSON.LazyValue{String}, tags::@NamedTuple{})
@ StructUtils ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:763
[5] (::StructUtils.var"#findfield##0#findfield##1"{FrankenStruct, JSON.PtrString, JSON.LazyValue{String}, StructUtils.StructClosure{FrankenStruct, Memory{Any}, JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, NTuple{12, Symbol}, NTuple{12, String}}})(i::Int64)
@ StructUtils ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:948
[6] macro expansion
@ ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:607 [inlined]
[7] _foreach
@ ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:610 [inlined]
[8] findfield(::Type{FrankenStruct}, k::JSON.PtrString, v::JSON.LazyValue{String}, f::StructUtils.StructClosure{FrankenStruct, Memory{Any}, JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, NTuple{12, Symbol}, NTuple{12, String}})
@ StructUtils ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:925
[9] StructClosure
@ ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:957 [inlined]
[10] applyobject(keyvalfunc::StructUtils.StructClosure{FrankenStruct, Memory{Any}, JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, NTuple{12, Symbol}, NTuple{12, String}}, x::JSON.LazyValue{String})
@ JSON ~/.julia/dev/JSON/src/lazy.jl:284
[11] applyeach
@ ~/.julia/dev/JSON/src/lazy.jl:182 [inlined]
[12] makestruct(style::JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing}, ::Type{FrankenStruct}, source::JSON.LazyValue{String})
@ StructUtils ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:984
[13] make
@ ~/.julia/packages/StructUtils/BDA5D/src/StructUtils.jl:795 [inlined]
[14] _parse
@ ~/.julia/dev/JSON/src/parse.jl:193 [inlined]
[15] parse(x::JSON.LazyValue{String}, ::Type{FrankenStruct}; dicttype::Type{JSON.Object{String, Any}}, null::Nothing, style::JSON.JSONReadStyle{JSON.Object{String, Any}, Nothing})
@ JSON ~/.julia/dev/JSON/src/parse.jl:189
[16] parse
@ ~/.julia/dev/JSON/src/parse.jl:189 [inlined]
[17] parse(buf::String, ::Type{FrankenStruct})
@ JSON ~/.julia/dev/JSON/src/parse.jl:181
[18] top-level scope
@ REPL[14]:1