ForEach Binding Issues

ConfigurableAddressForm.swift

struct ConfigurableAddressForm : View {
	@State private var formViewModel = ConfigurableFormViewModel()

	var body: some View {
		VStack {
			if formViewModel.viewModels.isEmpty {
				LoadingView().onAppear {
					self.loadForms()
				}
			} else {
				makeAddressForm(viewModel: formViewModel)
			}
		}
	}

	func makeAddressForm(viewModel: ConfigurableFormViewModel) -> some View {
		Form {
			Section(header: FormHeaderViewWithValidationStatus(title: viewModel.formType.capitalized, isValid: viewModel.isValid)) {
				ForEach(viewModel.viewModels) { vm in
					FormField(viewModel: $vm) //This is where errors occur.
				}
			}
			Section {
				makeSubmitButton(isEnabled: viewModel.isValid)
			}
		}
	}

	func loadForms() {
		let fetchResult: Result<ConfigurableFormViewModel, Error> = Fetcher.fetchLocalJSON(name: "FormJSON")
		switch fetchResult {
		case .success(let viewModel):
			self.formViewModel = viewModel
		case .failure(let error):
			print(error.localizedDescription)
		}
	}

	func makeSubmitButton(isEnabled: Bool) -> some View {
		HStack {
			Spacer()
			withAnimation {
				Button(action: printAddressFromVMs, label: {
					Text("Submit")
				}).disabled(!isEnabled)
			}
		}
	}

	func printAddressFromVMs() {
		print(formViewModel.viewModels.map { $0.output }.joined(separator: "\n"))
	}
}

ConfigurableFormViewModel.swift

class ConfigurableFormViewModel: BindableObject, Codable {
	var didChange = PassthroughSubject<[FormFieldViewModel], Never>()

	enum CodingKeys: String, CodingKey {
		case formType
		case viewModels = "formFields"
	}

	var formType: String = "Loading..."
	var viewModels: [FormFieldViewModel] = [] {
		didSet {
			didChange.send(viewModels)
		}
	}

	var isValid: Bool {
		return !viewModels.contains { !$0.isValid }
	}
}

FormField.swift

struct FormField : View {
	@Binding var viewModel: FormFieldViewModel

	var body: some View {
		VStack {
			TextField($viewModel.output, placeholder: Text(viewModel.placeholder))
			Line(color: Color.lightGray)
		}.padding()
	}
}