Google Maps filter (with passing linter and type checker) #477
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Make GMapsDurationProcessor export unformatted data as well, to enable later steps in the pipeline (such as filters) to access and process this data.
You can't re-open a NamedTemporaryFile on Windows while it's still open.
This PR involves some refactoring. The problem is that previously, filters ran before making any calls to external APIs. Therefore, just adding another filter for the distance doesn't actually work: the distance information is not yet available when we apply the filters. We can't just run the filters later, because then we would run the Google Maps API calls before we filtered out any properties, meaning that we would incur Google Maps API calls for all properties that we find in our search, including those that we later filter out anyway based on price, size, etc. - and we actually have to pay for those requests! My solution is to group the filters in two chains, and then run one chain before and one after external API calls have been made. This way, we can run the distance filter after the API calls are made, but keep everything else the same.
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