[Rails] return models using association sort

Hi all,

Think this is a really simple question, but so far cant find answers
after much searching!

I have 2 models, Event and Venue, an Event belongs_to a Venue.
A venue has an attribute locality, which is a string
I want to get an array of events, for which the venue they belong_to has
the locality attribute equal to London. A list of events in London!

That's all! I can think of a horrible way to do this, where I return all
events, go through the array, adding to a new array events where
event.venue.locality == "london", but this seems daft, is there a way I
can do this in a query, something like

@ed_events = Event.where(Venue.locality => "London")

I've found lots of help on more complicated joins between tables, but
cant find the syntax for this!

Thanks,

Mike

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