DOC-4734 added geo indexing examples (#3240)

* DOC-4734 added geo indexing examples

* DOC-4734 delete keys before starting tests

---------

Co-authored-by: Nedyalko Dyakov <nedyalko.dyakov@gmail.com>

Author: andy-stark-redis

doctests/geo_index_test.go

@@ -0,0 +1,206 @@
+// EXAMPLE: geoindex
+// HIDE_START
+package example_commands_test
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// HIDE_END
+
+func ExampleClient_geoindex() {
+	ctx := context.Background()
+
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "", // no password docs
+		DB:       0,  // use default DB
+		Protocol: 2,
+	})
+	// REMOVE_START
+	rdb.FTDropIndex(ctx, "productidx")
+	rdb.FTDropIndex(ctx, "geomidx")
+	rdb.Del(ctx, "product:46885", "product:46886", "shape:1", "shape:2", "shape:3", "shape:4")
+	// REMOVE_END
+
+	// STEP_START create_geo_idx
+	geoCreateResult, err := rdb.FTCreate(ctx,
+		"productidx",
+		&redis.FTCreateOptions{
+			OnJSON: true,
+			Prefix: []interface{}{"product:"},
+		},
+		&redis.FieldSchema{
+			FieldName: "$.location",
+			As:        "location",
+			FieldType: redis.SearchFieldTypeGeo,
+		},
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(geoCreateResult) // >>> OK
+	// STEP_END
+
+	// STEP_START add_geo_json
+	prd46885 := map[string]interface{}{
+		"description": "Navy Blue Slippers",
+		"price":       45.99,
+		"city":        "Denver",
+		"location":    "-104.991531, 39.742043",
+	}
+
+	gjResult1, err := rdb.JSONSet(ctx, "product:46885", "$", prd46885).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(gjResult1) // >>> OK
+
+	prd46886 := map[string]interface{}{
+		"description": "Bright Green Socks",
+		"price":       25.50,
+		"city":        "Fort Collins",
+		"location":    "-105.0618814,40.5150098",
+	}
+
+	gjResult2, err := rdb.JSONSet(ctx, "product:46886", "$", prd46886).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(gjResult2) // >>> OK
+	// STEP_END
+
+	// STEP_START geo_query
+	geoQueryResult, err := rdb.FTSearch(ctx, "productidx",
+		"@location:[-104.800644 38.846127 100 mi]",
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(geoQueryResult)
+	// >>> {1 [{product:46885...
+	// STEP_END
+
+	// STEP_START create_gshape_idx
+	geomCreateResult, err := rdb.FTCreate(ctx, "geomidx",
+		&redis.FTCreateOptions{
+			OnJSON: true,
+			Prefix: []interface{}{"shape:"},
+		},
+		&redis.FieldSchema{
+			FieldName: "$.name",
+			As:        "name",
+			FieldType: redis.SearchFieldTypeText,
+		},
+		&redis.FieldSchema{
+			FieldName:         "$.geom",
+			As:                "geom",
+			FieldType:         redis.SearchFieldTypeGeoShape,
+			GeoShapeFieldType: "FLAT",
+		},
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(geomCreateResult) // >>> OK
+	// STEP_END
+
+	// STEP_START add_gshape_json
+	shape1 := map[string]interface{}{
+		"name": "Green Square",
+		"geom": "POLYGON ((1 1, 1 3, 3 3, 3 1, 1 1))",
+	}
+
+	gmjResult1, err := rdb.JSONSet(ctx, "shape:1", "$", shape1).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(gmjResult1) // >>> OK
+
+	shape2 := map[string]interface{}{
+		"name": "Red Rectangle",
+		"geom": "POLYGON ((2 2.5, 2 3.5, 3.5 3.5, 3.5 2.5, 2 2.5))",
+	}
+
+	gmjResult2, err := rdb.JSONSet(ctx, "shape:2", "$", shape2).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(gmjResult2) // >>> OK
+
+	shape3 := map[string]interface{}{
+		"name": "Blue Triangle",
+		"geom": "POLYGON ((3.5 1, 3.75 2, 4 1, 3.5 1))",
+	}
+
+	gmjResult3, err := rdb.JSONSet(ctx, "shape:3", "$", shape3).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(gmjResult3) // >>> OK
+
+	shape4 := map[string]interface{}{
+		"name": "Purple Point",
+		"geom": "POINT (2 2)",
+	}
+
+	gmjResult4, err := rdb.JSONSet(ctx, "shape:4", "$", shape4).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(gmjResult4) // >>> OK
+	// STEP_END
+
+	// STEP_START gshape_query
+	geomQueryResult, err := rdb.FTSearchWithArgs(ctx, "geomidx",
+		"(-@name:(Green Square) @geom:[WITHIN $qshape])",
+		&redis.FTSearchOptions{
+			Params: map[string]interface{}{
+				"qshape": "POLYGON ((1 1, 1 3, 3 3, 3 1, 1 1))",
+			},
+			DialectVersion: 4,
+			Limit:          1,
+		},
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(geomQueryResult)
+	// >>> {1 [{shape:4...
+	// STEP_END
+
+	// Output:
+	// OK
+	// OK
+	// OK
+	// {1 [{product:46885 <nil> <nil> <nil> map[$:{"city":"Denver","description":"Navy Blue Slippers","location":"-104.991531, 39.742043","price":45.99}]}]}
+	// OK
+	// OK
+	// OK
+	// OK
+	// OK
+	// {1 [{shape:4 <nil> <nil> <nil> map[$:[{"geom":"POINT (2 2)","name":"Purple Point"}]]}]}
+}