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Fix sql sanitization of multi geoms #81

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Resolves #79

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Thank you for pushing these changes ! I have a few questions left, and I'd also like a second reviewer to see if that is really the direction we want to go (there might be issues related to this choice that we're not seeing..) @keithdoggett ?

module MultiGeomSanitization
private

# NOTE connection and value order is swapped in Rails 8
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What should we do about this note?

@@ -124,6 +124,16 @@ def test_arel_visit_RGeo_ActiveRecord_SpatialNamedFunction_with_distinct
assert_equal("SPATIAL_FUNC(DISTINCT ST_GeomFromText('POINT (1.0 2.0)'), ST_GeomFromText('LINESTRING (1.0 2.0, 2.0 3.0)'))", sql.value)
end

def test_multi_geom_sanitization
multi_geom = RGeo::Geos.factory.parse_wkt("MULTIPOLYGON (((0 0, 0 1, 1 1, 0 0)),((1 1, 0 0, 0 1, 1 1)))")
sql = "ST_DWithin(geom, :geom, :buffer)"
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why do we need that st_dwithin function for the test?

@@ -9,6 +9,7 @@
require "minitest/autorun"
require "rgeo-activerecord"
require "support/fake_record"
require "active_support/core_ext/date/acts_like"
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why do we need this?

@@ -88,6 +88,10 @@ def quote(thing, column = nil)
"'#{thing.to_s.gsub("'", "\\\\'")}'"
end
end

def cast_bound_value(value)
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why using this fake record class rather than any record?

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MULTI geoms are bound to sql separately
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