Updating field values

[bkilshaw]

I've been playing around with creating a custom field that lets a user search for an address, it uses the google auto complete API to suggest matches, and when the user selects a result it auto-populates the related address fields.

Are there any existing methods available that would let me set the value of a various fields outside the normal flow?

 def handle_event("select", %{"value" => place_id}, socket) do
   address_details = get_address_details(place_id)

    # set address related fields

    {:noreply, socket}
  end

[Flo0807]

Hey, I appreciate your patience with this!

It is possible to set values in the changeset function. In this function you can also access the assigns and target inputs.

Here is some example code:

def changeset(user, attrs, metadata) do
  # the metadata contains the target input and assigns
  target = Keyword.get(metadata, :target)
  assigns = Keyword.get(metadata, :assigns)

  user
  |> cast(attrs, [...])
  |> maybe_put_address_details(target)
  ...
end

# this function is being called if the input target is "place"
def maybe_put_address_details(changeset, "place" = _target) do
  place_id = get_field(changeset, :place)
  address_details = get_address_details(place_id)

  put_change(changeset, :address_details, address_details)
end

def maybe_put_address_details(changeset, _target) do
  changeset
end