Make submittable a ListChangesOption

Some scripts rely on the submittable bit from QueryChanges to
implement an 'automatically submit when approved to do so' feature,
to allow a person to mark a change as Autosubmit-Ready and go home
for the night in the expectation that a CI system will verify the
change and cause it to be submitted.

4cd05b2c5e (Only compute submittable
during submitted_together, 2016-09-17), which was needed for
performance reasons when rendering dashboards, broke these scripts.
Allow them to work again through a new o=SUBMITTABLE option.

Change-Id: Ia6ce6d95b1d774ede786b797eb04ce1353de6c86

Documentation/rest-api-changes.txt

@@ -301,6 +301,12 @@ default. Optional fields are:
     link:user-search.html#reviewedby[reviewedby:self].
 --
 
+[[submittable]]
+--
+* `SUBMITTABLE`: include the `submittable` field in link:#commit-info[CommitInfo],
+  which can be used to tell if the change is reviewed and ready for submit.
+--
+
 [[web-links]]
 --
 * `WEB_LINKS`: include the `web_links` field in link:#commit-info[CommitInfo],
@@ -1420,8 +1426,9 @@ changes to be merged.
 The listed changes use the same format as in
 link:#list-changes[Query Changes] with the
 link:#labels[`LABELS`], link:#detailed-labels[`DETAILED_LABELS`],
-link:#current-revision[`CURRENT_REVISION`], and
+link:#current-revision[`CURRENT_REVISION`],
-link:#current-commit[`CURRENT_COMMIT`] options set.
+link:#current-commit[`CURRENT_COMMIT`], and
+link:#submittable[`SUBMITTABLE`] options set.
 
 Standard link:#query-options[formatting options] can be specified
 with the `o` parameter, as well as the `submitted_together` specific
@@ -4640,7 +4647,7 @@ Whether the change is mergeable. +
 Not set for merged changes, or if the change has not yet been tested.
 |`submittable`        |optional|
 Whether the change has been approved by the project submit rules. +
-Provided only by link:#submitted-together[submitted_together].
+Only set if link:#submittable[requested].
 |`insertions`         ||
 Number of inserted lines.
 |`deletions`          ||

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/rest/change/AbstractSubmit.java

@@ -20,6 +20,7 @@ import static com.google.common.truth.Truth.assert_;
 import static com.google.common.truth.TruthJUnit.assume;
 import static com.google.gerrit.extensions.client.ListChangesOption.CURRENT_REVISION;
 import static com.google.gerrit.extensions.client.ListChangesOption.DETAILED_LABELS;
+import static com.google.gerrit.extensions.client.ListChangesOption.SUBMITTABLE;
 import static com.google.gerrit.server.group.SystemGroupBackend.CHANGE_OWNER;
 import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
 import static java.util.concurrent.TimeUnit.SECONDS;
@@ -474,6 +475,9 @@ public abstract class AbstractSubmit extends AbstractDaemonTest {
   }
 
   protected void assertSubmittable(String changeId) throws Exception {
+    assertThat(get(changeId, SUBMITTABLE).submittable)
+        .named("submit bit on ChangeInfo")
+        .isEqualTo(true);
     RevisionResource rsrc = parseCurrentRevisionResource(changeId);
     UiAction.Description desc = submitHandler.getDescription(rsrc);
     assertThat(desc.isVisible()).named("visible bit on submit action").isTrue();

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/client/ListChangesOption.java

@@ -69,7 +69,10 @@ public enum ListChangesOption {
   PUSH_CERTIFICATES(18),
 
   /** Include change's reviewer updates. */
-  REVIEWER_UPDATES(19);
+  REVIEWER_UPDATES(19),
+
+  /** Set the submittable boolean. */
+  SUBMITTABLE(20);
 
   private final int value;
 

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeJson.java

@@ -32,6 +32,7 @@ import static com.google.gerrit.extensions.client.ListChangesOption.MESSAGES;
 import static com.google.gerrit.extensions.client.ListChangesOption.PUSH_CERTIFICATES;
 import static com.google.gerrit.extensions.client.ListChangesOption.REVIEWED;
 import static com.google.gerrit.extensions.client.ListChangesOption.REVIEWER_UPDATES;
+import static com.google.gerrit.extensions.client.ListChangesOption.SUBMITTABLE;
 import static com.google.gerrit.extensions.client.ListChangesOption.WEB_LINKS;
 import static com.google.gerrit.server.CommonConverters.toGitPerson;
 import static java.util.stream.Collectors.toList;
@@ -177,7 +178,6 @@ public class ChangeJson {
 
   private boolean lazyLoad = true;
   private AccountLoader accountLoader;
-  private boolean includeSubmittable;
   private Map<Change.Id, List<SubmitRecord>> submitRecords;
   private FixInput fix;
 
@@ -233,11 +233,6 @@ public class ChangeJson {
         : EnumSet.copyOf(options);
   }
 
-  public ChangeJson includeSubmittable(boolean include) {
-    includeSubmittable = include;
-    return this;
-  }
-
   public ChangeJson lazyLoad(boolean load) {
     lazyLoad = load;
     return this;
@@ -454,7 +449,7 @@ public class ChangeJson {
         out.submitType = str.type;
       }
       out.mergeable = cd.isMergeable();
-      if (includeSubmittable) {
+      if (has(SUBMITTABLE)) {
         out.submittable = submittable(cd);
       }
     }

gerrit-server/src/main/java/com/google/gerrit/server/change/SubmittedTogether.java

@@ -54,7 +54,8 @@ public class SubmittedTogether implements RestReadView<ChangeResource> {
 
   private final EnumSet<ListChangesOption> jsonOpt = EnumSet.of(
       ListChangesOption.CURRENT_REVISION,
-      ListChangesOption.CURRENT_COMMIT);
+      ListChangesOption.CURRENT_COMMIT,
+      ListChangesOption.SUBMITTABLE);
 
   private final ChangeJson.Factory json;
   private final Provider<ReviewDb> dbProvider;
@@ -152,9 +153,7 @@ public class SubmittedTogether implements RestReadView<ChangeResource> {
       }
 
       SubmittedTogetherInfo info = new SubmittedTogetherInfo();
-      info.changes = json.create(jsonOpt)
+      info.changes = json.create(jsonOpt).formatChangeDatas(cds);
-        .includeSubmittable(true)
-        .formatChangeDatas(cds);
       info.nonVisibleChanges = hidden;
       return info;
     } catch (OrmException | IOException e) {