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cbachich/array_to_rgeo_multipolygon.rb

Last active August 29, 2015 14:12
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Converting an array to a Multipolygon String for RGeo
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array_to_rgeo_multipolygon.rb
test = [[[-70, 30],[-71, 31]],[[0,0],[-180,90],[-179,75]]]=> [[[-70, 30], [-71, 31]], [[0, 0], [-180, 90], [-179, 75]]]
converted = "MULTIPOLYGON ((#{test.map { |coord| "(#{coord.map { |pair| pair.join(" ") }.join ", "})" }.join ", "}))"
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output.txt
MULTIPOLYGON (((-70 30, -71 31), (0 0, -180 90, -179 75)))
@kyletolle
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Instead of having one line do everything (all the maps, joins, etc), use multiple lines. You could likely factor out methods at that point, which would increase readability for one thing, and make it easier to understand what's going on.

Still seems like performance is going to be an issue when you're traversing so many nested arrays, but I'm not immediately sure of a way around that.

multipolygon_string = "MULTIPOLYGON ((#{coordinates_string}))"

@cbachich
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Yeah that is probably best. I'm still trying to figure out if there is a way to optimize this. Thanks for the feedback.

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