Create update api for attachment.

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

@@ -0,0 +1,20 @@
+package run.halo.app.model.params;
+
+import lombok.Data;
+import run.halo.app.model.dto.base.InputConverter;
+import run.halo.app.model.entity.Attachment;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * Attachment params.
+ *
+ * @author : RYAN0UP
+ * @date : 2019/04/20
+ */
+@Data
+public class AttachmentParam implements InputConverter<Attachment> {
+
+    @NotBlank(message = "Attachment name must not be blank")
+    private String name;
+}

src/main/java/run/halo/app/web/controller/admin/api/AttachmentController.java

@@ -9,9 +9,11 @@ import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 import run.halo.app.model.dto.AttachmentOutputDTO;
 import run.halo.app.model.entity.Attachment;
+import run.halo.app.model.params.AttachmentParam;
 import run.halo.app.model.params.AttachmentQuery;
 import run.halo.app.service.AttachmentService;
 
+import javax.validation.Valid;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -58,6 +60,15 @@ public class AttachmentController {
         return attachmentService.convertToDto(attachment);
     }
 
+    @PutMapping("{attachmentId:\\d+}")
+    @ApiOperation("Updates a attachment")
+    public AttachmentOutputDTO updateBy(@PathVariable("attachmentId") Integer attachmentId,
+                                        @RequestBody @Valid AttachmentParam attachmentParam) {
+        Attachment attachment = attachmentService.getById(attachmentId);
+        attachmentParam.update(attachment);
+        return new AttachmentOutputDTO().convertFrom(attachmentService.update(attachment));
+    }
+
     /**
      * Delete attachment by id
      *