Unable to call method in property_of block

[Stratus3D]

I have a property_of block that needs to contain some special logic I have for choosing a state and city. I need to make sure the city selected is within the chosen state. I want to do something like this:

properties = property_of do
    state = choose(*states)
    city = choose(*cities_within_state(state))

    [state, city]
end

This does not work because cities_within_state is a method defined in an included module, which doesn't seem to be available within the context of the property_of block (though it is available outside it). I need to invoke the method within the property_of block because that is the only scope in which the state variable exists.

I was able to come up with a workaround to invoke the the method within the block:

properties = property_of do
    state = choose(*states)
    cities = Class.new.extend(ModuleContainingMethod).cities_within_state(state)
    city = choose(*cities)

    [state, city]
end

Is there a better way of doing this?

[krishan]

It seems that the property_of block is executed on a Rantly instance, which makes the "local" methods unavailable.

It might work to store the method inside a lambda in a local variable, like this:

cities_within_states_fn = -> { |state| cities_within_state(state) }

properties = property_of do
    state = choose(*states)
    cities = cities_within_states_fn.call(state)
    city = choose(*cities)

    [state, city]
end

[diasbruno]

You can also extend Rantly::Data.

require 'rantly/data'

module Rantly::Data
  def state_and_city
    state = choose(*states)
    city = choose(*cities_within_state(state))

    [state, city]
  end
end

property_of do
   state_and_city
end