What is the correct syntax to run a custom action from an input file?

[andrisfreimanis]

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Question

Dear All,
I have written a custom action and am getting this error when running the input file.

<filename>.i:80.1: section '[lapsaApp]' does not have an associated "Action".
 Common causes:
- you misspelled the Action/section name
- the app you are running does not support this Action/syntax
<filename>.i:81.3: section '[lapsaApp/MechanicsActionRPD]' does not have an associated "Action".
 Common causes:
- you misspelled the Action/section name
- the app you are running does not support this Action/syntax

But I registered the action as such:

registerMooseAction("lapsaApp", MechanicsActionRPD, "setup_mesh_complete");
registerMooseAction("lapsaApp", MechanicsActionRPD, "validate_coordinate_systems");
registerMooseAction("lapsaApp", MechanicsActionRPD, "add_variable");
registerMooseAction("lapsaApp", MechanicsActionRPD, "add_aux_variable");
registerMooseAction("lapsaApp", MechanicsActionRPD, "add_kernel");
registerMooseAction("lapsaApp", MechanicsActionRPD, "add_aux_kernel");
registerMooseAction("lapsaApp", MechanicsActionRPD, "add_material");
registerMooseAction("lapsaApp", MechanicsActionRPD, "add_user_object");

Then in the input file I tried these blocks:

[lapsaApp]
  [MechanicsActionRPD]
    strain = FINITE
    displacements = 'disp_x disp_y'
    add_variables = true
  []
[]

and

[MechanicsActionRPD]
  strain = FINITE
  displacements = 'disp_x disp_y'
  add_variables = true
[]

What is the correct syntax to run a custom action?

Best regards
Andris

[GiudGiud]

Hello you need to register the action to a syntax as well.

You can see the modules app source files, notably NavierStokes for an example.

In modules/navier_stokes/src/base/NavierStokesApp.C

[andrisfreimanis]

Thanks, works now.