Rename market symbol filter to market_id

src/main/java/io/newsdata/api/Article.java

@@ -41,5 +41,7 @@ public record Article(
         @JsonProperty("ai_org") List<String> aiOrg,
         @JsonProperty("sentiment") String sentiment,
         @JsonProperty("sentiment_stats") Map<String, Object> sentimentStats,
-        @JsonProperty("datatype") String dataType
+        @JsonProperty("datatype") String dataType,
+        @JsonProperty("symbol") List<String> symbol,
+        @JsonProperty("market_id") List<String> marketId
 ) {}

src/main/java/io/newsdata/api/Constants.java

@@ -109,7 +109,7 @@ private Constants() {}
                     "excludecountry", "domain", "domainurl", "excludedomain", "language",
                     "excludelanguage", "prioritydomain", "timezone", "timeframe", "size",
                     "full_content", "image", "video", "page", "tag", "sentiment",
-                    "excludefield", "removeduplicate", "organization", "symbol", "id", "url",
+                    "excludefield", "removeduplicate", "organization", "market_id", "id", "url",
                     "sort", "creator", "datatype", "sentiment_score"
             )),
             Map.entry("count", Set.of(
@@ -130,7 +130,7 @@ private Constants() {}
                     "from_date", "to_date", "q", "qintitle", "qinmeta", "country",
                     "excludecountry", "domain", "domainurl", "excludedomain", "language",
                     "excludelanguage", "full_content", "image", "video", "organization",
-                    "symbol", "prioritydomain", "page", "sentiment", "removeduplicate", "size",
+                    "market_id", "prioritydomain", "page", "sentiment", "removeduplicate", "size",
                     "sort", "tag", "interval", "creator", "datatype", "sentiment_score"
             ))
     );

src/test/java/io/newsdata/api/NewsDataApiClientTest.java

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
@@ -243,6 +244,31 @@ void articleFieldsDecodeFromSnakeCase() {
         assertEquals(1, art.sourcePriority());
     }
 
+    // Market results carry both `symbol` and `market_id`; the two are separate
+    // response fields and both decode onto Article.
+    @Test
+    void articleDecodesSymbolAndMarketId() {
+        handle("market", exchange -> respond(exchange, 200,
+                successBody("[{\"article_id\":\"m1\",\"symbol\":[\"AAPL\",\"MSFT\"],"
+                        + "\"market_id\":[\"NASDAQ:AAPL\",\"NASDAQ:MSFT\"]}]")));
+        var client = defaultBuilder().build();
+        var resp = client.market(Params.of().with("market_id", "AAPL"));
+        var art = resp.articles(client.objectMapper()).get(0);
+        assertEquals(List.of("AAPL", "MSFT"), art.symbol());
+        assertEquals(List.of("NASDAQ:AAPL", "NASDAQ:MSFT"), art.marketId());
+    }
+
+    @Test
+    void articleSymbolAndMarketIdAreNullWhenAbsent() {
+        handle("latest", exchange -> respond(exchange, 200,
+                successBody("[{\"article_id\":\"a1\",\"title\":\"t\"}]")));
+        var client = defaultBuilder().build();
+        var art = client.latest(Params.of().with("q", "x"))
+                .articles(client.objectMapper()).get(0);
+        assertNull(art.symbol());
+        assertNull(art.marketId());
+    }
+
     @Test
     void countReturnsAggregateMap() {
         handle("count", exchange -> respond(exchange, 200,