Add a api of update categories in batch

src/main/java/run/halo/app/controller/admin/api/CategoryController.java

@@ -1,10 +1,11 @@
 package run.halo.app.controller.admin.api;
 
 import static org.springframework.data.domain.Sort.Direction.ASC;
-import static org.springframework.data.domain.Sort.Direction.DESC;
 
 import io.swagger.annotations.ApiOperation;
 import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
 import javax.validation.Valid;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.web.SortDefault;
@@ -89,6 +90,20 @@ public CategoryDTO updateBy(@PathVariable("categoryId") Integer categoryId,
         return categoryService.convertTo(categoryService.update(categoryToUpdate));
     }
 
+    @PutMapping("/batch")
+    @ApiOperation("Updates category in batch")
+    public List<CategoryDTO> updateBatchBy(@RequestBody List<@Valid CategoryParam> categoryParams) {
+        List<Category> categoriesToUpdate = categoryParams.stream()
+            .filter(categoryParam -> Objects.nonNull(categoryParam.getId()))
+            .map(categoryParam -> {
+                Category categoryToUpdate = categoryService.getById(categoryParam.getId());
+                categoryParam.update(categoryToUpdate);
+                return categoryToUpdate;
+            })
+            .collect(Collectors.toList());
+        return categoryService.convertTo(categoryService.updateInBatch(categoriesToUpdate));
+    }
+
     @DeleteMapping("{categoryId:\\d+}")
     @ApiOperation("Deletes category")
     public void deletePermanently(@PathVariable("categoryId") Integer categoryId) {

src/main/java/run/halo/app/model/params/CategoryParam.java

@@ -14,11 +14,14 @@
  *
  * @author johnniang
  * @author ryanwang
+ * @author guqing
  * @date 2019-03-21
  */
 @Data
 public class CategoryParam implements InputConverter<Category> {
 
+    private Integer id;
+
     @NotBlank(message = "分类名称不能为空")
     @Size(max = 255, message = "分类名称的字符长度不能超过 {max}")
     private String name;