Merge b27f877 into 480e9ac

firebase.go

@@ -36,6 +36,7 @@ const (
 	formatParam       = "format"
 	shallowParam      = "shallow"
 	orderByParam      = "orderBy"
+	equalToParam      = "equalTo"
 	startAtParam      = "startAt"
 	endAtParam        = "endAt"
 	formatVal         = "export"

query.go

@@ -62,6 +62,19 @@ func (fb *Firebase) OrderBy(value string) *Firebase {
 	return c
 }
 
+// EqualTo sends the query string equalTo so that one can find a single value
+//
+// Reference https://www.firebase.com/docs/rest/guide/retrieving-data.html#section-rest-filtering
+func (fb *Firebase) EqualTo(value string) *Firebase {
+	c := fb.copy()
+	if value != "" {
+		c.params.Set(equalToParam, escapeString(value))
+	} else {
+		c.params.Del(equalToParam)
+	}
+	return c
+}
+
 func escapeString(s string) string {
 	_, err := strconv.ParseInt(s, 10, 64)
 	if err != nil {

query_test.go

@@ -45,6 +45,21 @@ func TestOrderBy(t *testing.T) {
 	assert.Equal(t, orderByParam+"=%22user_id%22", req.URL.Query().Encode())
 }
 
+func TestEqualTo(t *testing.T) {
+	t.Parallel()
+	var (
+		server = newTestServer("")
+		fb     = New(server.URL, nil)
+	)
+	defer server.Close()
+
+	fb.EqualTo("user_id").Value("")
+	require.Len(t, server.receivedReqs, 1)
+
+	req := server.receivedReqs[0]
+	assert.Equal(t, equalToParam+"=%22user_id%22", req.URL.Query().Encode())
+}
+
 func TestLimitToFirst(t *testing.T) {
 	t.Parallel()
 	var (