10 replies

Adding an association in an action based on argument

Hey, been a few minutes since I've done any work on an Ash project, hoping someone can jog my memory on how to accomplish something.

Basically, I've got two resources,

Maps.Map

Maps.Map

and

Pin

Pin

, where a

Pin

Pin

belongs to a

Map

Map

. I want to pass an existing

Map

Map

to the

Pin

Pin

as part of the create action. like so

# usage (via code interface)
Maps.Map.add_pin_to_map(some_map, attrs)

# usage (via code interface)
Maps.Map.add_pin_to_map(some_map, attrs)

Been searching the docs, but I can't really figure out how to take my argument and add the association

# maps/pin.ex
actions do
  create :add_to_map do
      argument :map, :struct,
        allow_nil?: false,
        constraints: [instance_of: Maps.Map]
  end
end

relationships do
  belongs_to :map, Maps.Map
end

# maps/pin.ex
actions do
  create :add_to_map do
      argument :map, :struct,
        allow_nil?: false,
        constraints: [instance_of: Maps.Map]
  end
end

relationships do
  belongs_to :map, Maps.Map
end

I was thinking it's something like using

change

change

like so, but not quite

# raises BadMapError
change set_attribute(:map_id, arg(:map).id)
# also raises BadMapError
      change fn changeset, context ->
        map = arg(:map)
        Ash.Changeset.change_attribute(:map_id, map.id)
      end

# raises BadMapError
change set_attribute(:map_id, arg(:map).id)
# also raises BadMapError
      change fn changeset, context ->
        map = arg(:map)
        Ash.Changeset.change_attribute(:map_id, map.id)
      end

Thanks!

Ash Framework•5mo ago•

10 replies

matt_savvy

Adding an association in an action based on argument

Hey, been a few minutes since I've done any work on an Ash project, hoping someone can jog my memory on how to accomplish something.

Basically, I've got two resources,

Maps.Map

Maps.Map

and

Pin

Pin

, where a

Pin

Pin

belongs to a

Map

Map

. I want to pass an existing

Map

Map

to the

Pin

Pin

as part of the create action. like so

# usage (via code interface)
Maps.Map.add_pin_to_map(some_map, attrs)

# usage (via code interface)
Maps.Map.add_pin_to_map(some_map, attrs)

Been searching the docs, but I can't really figure out how to take my argument and add the association

# maps/pin.ex
actions do
  create :add_to_map do
      argument :map, :struct,
        allow_nil?: false,
        constraints: [instance_of: Maps.Map]
  end
end

relationships do
  belongs_to :map, Maps.Map
end

# maps/pin.ex
actions do
  create :add_to_map do
      argument :map, :struct,
        allow_nil?: false,
        constraints: [instance_of: Maps.Map]
  end
end

relationships do
  belongs_to :map, Maps.Map
end

I was thinking it's something like using

change

change

like so, but not quite

# raises BadMapError
change set_attribute(:map_id, arg(:map).id)
# also raises BadMapError
      change fn changeset, context ->
        map = arg(:map)
        Ash.Changeset.change_attribute(:map_id, map.id)
      end

# raises BadMapError
change set_attribute(:map_id, arg(:map).id)
# also raises BadMapError
      change fn changeset, context ->
        map = arg(:map)
        Ash.Changeset.change_attribute(:map_id, map.id)
      end

Thanks!

Adding an association in an action based on argument

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