Set playa entry dynamically

Question

I have set an extended set of segments based on playa parent/child relationships

http://example.com/template-group/template/playa-parent/playa-child

I would like retrieve the content of an entry based on segment 4 but

1. I'm not sure I can do this and
2. I'm not sure if what I am doing is right?

{exp:channel:entries channel="countries" dynamic="yes" limit="1"}
{exp:playa:parent dynamic="yes" limit="1" channel="cities"}
{title}
{/exp:playa:parent}
{/exp:channel:entries}

I expect cities to yield the entries title ("London") based on the following URL

http://example.com/template-group/template/england/london

[EDITED: Typo fixed for limit syntax]

Answer 1

Answering my own question in case others have a similar issue.

I reverted to only using the {exp:channel:entries} tag with the url_title peremeter set to {last_segment} like this

{exp:channel:entries
    channel="cities"
    dynamic="no"
    url_title="{last_segment}"
}

Simple.

Answer 2

Not sure if it's a typo, but the first thing I noticed was your limit parameter is a minus, not an equal symbol to equal the value 1 on the channel entry pair tag. Countries are the parent as stated, so wouldn't you want to use?

{exp:channel:entries channel="countries" dynamic="yes" limit="1"} {exp:playa:children field="[your_country_field_relationship_to_city_entry]"} {title} {/exp:playa:children} {/exp:channel:entries}

P.S. With the exp:playa:children you can pretty much use any parameter the channel entries tag has available. So even a url_title parameter with segment_4 might work in this case.