add new wot-models definition update endpoint #1843

documentation/src/main/resources/openapi/ditto-api-2.yml

@@ -987,6 +987,92 @@ paths:
             * a string: `"value"` - Currently the definition should follow the pattern: [_a-zA-Z0-9\-]:[_a-zA-Z0-9\-]:[_a-zA-Z0-9\-]
             * an empty string: `""`
             * `null`: the definition will be deleted
+    /api/2/things/{thingId}/migrateDefinition:
+      put:
+        summary: Migrate Thing Definition
+        description: |-
+          Migrate the definition of a Thing with the given `thingId`. The update includes a new definition URL and optional migration payload.
+
+          The operation will merge the provided data into the existing thing. If `initializeProperties` is set to `true`, missing properties will be initialized.
+
+          **Example usage:**
+          ```json
+          {
+            "thingDefinitionUrl": "https://models.example.com/thing-definition-1.0.0.tm.jsonld",
+            "migrationPayload": {
+              "attributes": {
+                "manufacturer": "New Corp",
+                "location": "Berlin, main floor"
+              },
+              "features": {
+                "thermostat": {
+                  "properties": {
+                    "status": {
+                      "temperature": {
+                        "value": 23.5,
+                        "unit": "DEGREE_CELSIUS"
+                      }
+                    }
+                  }
+                }
+              }
+            },
+            "patchConditions": {
+              "thing:/features/thermostat": "not(exists(/features/thermostat))"
+            },
+            "initializeMissingPropertiesFromDefaults": true
+          }
+          ```
+        tags:
+          - Things
+        parameters:
+          - name: thingId
+            in: path
+            required: true
+            description: The unique identifier of the Thing to update.
+            schema:
+              type: string
+        requestBody:
+          required: true
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/MigrateThingDefinitionRequest'
+        responses:
+          '204':
+            description: The thing definition was successfully updated.
+          '400':
+            description: |-
+              The request could not be completed. Possible reasons:
+                * Invalid JSON request body.
+                * Missing or incorrect values in the request.
+            content:
+              application/json:
+                schema:
+                  $ref: '#/components/schemas/AdvancedError'
+          '401':
+            description: The request could not be completed due to missing authentication.
+            content:
+              application/json:
+                schema:
+                  $ref: '#/components/schemas/AdvancedError'
+          '403':
+            description: The caller does not have permission to update the thing definition.
+            content:
+              application/json:
+                schema:
+                  $ref: '#/components/schemas/AdvancedError'
+          '404':
+            description: The thing with the specified ID was not found.
+            content:
+              application/json:
+                schema:
+                  $ref: '#/components/schemas/AdvancedError'
+          '412':
+            $ref: '#/components/responses/PreconditionFailed'
+          '424':
+            $ref: '#/components/responses/DependencyFailed'
+
     delete:
       summary: Delete the definition of a specific thing
       description: Deletes the definition of the thing identified by the `thingId`.
@@ -9273,6 +9359,57 @@ components:
       required:
         - thingId
         - policyId
+    MigrateThingDefinitionRequest:
+      type: object
+      description: JSON payload to update the definition of a Thing.
+      properties:
+        thingDefinitionUrl:
+          type: string
+          format: uri
+          description: "The URL of the new Thing definition to be applied."
+          example: "https://models.example.com/thing-definition-1.0.0.tm.jsonld"
+        migrationPayload:
+          type: object
+          description: "Optional migration payload with updates to attributes and features."
+          properties:
+            attributes:
+              type: object
+              additionalProperties: true
+              description: "Attributes to be updated in the thing."
+              example:
+                manufacturer: "New Corp"
+                location: "Berlin, main floor"
+            features:
+              type: object
+              additionalProperties:
+                type: object
+                properties:
+                  properties:
+                    type: object
+                    additionalProperties: true
+              description: "Features to be updated in the thing."
+              example:
+                thermostat:
+                  properties:
+                    status:
+                      temperature:
+                        value: 23.5
+                        unit: "DEGREE_CELSIUS"
+        patchConditions:
+          type: object
+          description: "Optional conditions to apply the migration only if the existing thing matches the specified values."
+          additionalProperties:
+            type: string
+          example:
+            thing:/features/thermostat: "not(exists(/features/thermostat))"
+        initializeMissingPropertiesFromDefaults:
+          type: boolean
+          description: "Flag indicating whether missing properties should be initialized with default values."
+          example: true
+      required:
+        - thingId
+        - thingDefinitionUrl
+        - migrationPayload
     NewPolicy:
       type: object
       description: Policy consisting of policy entries

documentation/src/main/resources/openapi/sources/api-2-index.yml

@@ -60,6 +60,8 @@ paths:
     $ref: "./paths/things/index.yml"
   '/api/2/things/{thingId}':
     $ref: "./paths/things/thing.yml"
+  '/api/2/things/{thingId}/MigrateDefinition':
+    $ref: "./paths/things/thing.yml"
   '/api/2/things/{thingId}/definition':
     $ref: "./paths/things/definition.yml"
   '/api/2/things/{thingId}/policyId':

documentation/src/main/resources/openapi/sources/paths/things/thing.yml

@@ -1,4 +1,4 @@
-# Copyright (c) 2020 Contributors to the Eclipse Foundation
+# Copyright (c) 2025 Contributors to the Eclipse Foundation
 #
 # See the NOTICE file(s) distributed with this work for additional
 # information regarding copyright ownership.
@@ -502,6 +502,82 @@ patch:
                   smartMode: null
                   tempToHold: 50
     description: JSON representation of the thing to be patched.
+/post:
+  summary: Update the definition of an existing Thing
+  description: |-
+    Updates the definition of the specified thing by providing a new definition URL along with an optional migration payload.
+
+    The request body allows specifying:
+    - A new Thing definition URL.
+    - A migration payload containing updates to attributes and features.
+    - Patch conditions to ensure consistent updates.
+    - Whether properties should be initialized if missing.
+
+    ### Example:
+    ```json
+    {
+      "thingDefinitionUrl": "https://example.com/new-thing-definition.json",
+      "migrationPayload": {
+        "attributes": {
+          "manufacturer": "New Corp"
+        },
+        "features": {
+          "sensor": {
+            "properties": {
+              "status": {
+                "temperature": {
+                  "value": 25.0
+                }
+              }
+            }
+          }
+        }
+      },
+      "patchConditions": {
+        "thing:/features/sensor": "not(exists(/features/sensor))"
+      },
+      "initializeMissingPropertiesFromDefaults": true
+    }
+    ```
+
+  tags:
+    - Things
+  parameters:
+    - $ref: '../../parameters/thingIdPathParam.yml'
+  requestBody:
+    description: JSON payload containing the new definition URL, migration payload, patch conditions, and initialization flag.
+    required: true
+    content:
+      application/json:
+        schema:
+          $ref: '../../schemas/things/migrateThingDefinitionRequest.yml'
+  responses:
+    '204':
+      description: The thing definition was successfully updated. No content is returned.
+    '400':
+      description: The request could not be processed due to invalid input.
+      content:
+        application/json:
+          schema:
+            $ref: '../../schemas/errors/advancedError.yml'
+    '401':
+      description: Unauthorized request due to missing authentication.
+      content:
+        application/json:
+          schema:
+            $ref: '../../schemas/errors/advancedError.yml'
+    '404':
+      description: The specified thing could not be found.
+      content:
+        application/json:
+          schema:
+            $ref: '../../schemas/errors/advancedError.yml'
+    '412':
+      description: The update conditions were not met.
+      content:
+        application/json:
+          schema:
+            $ref: '../../schemas/errors/advancedError.yml'
 delete:
   summary: Delete a specific thing
   description: |-

documentation/src/main/resources/openapi/sources/schemas/things/migrateThingDefinitionRequest.yml

@@ -0,0 +1,65 @@
+# Copyright (c) 2025 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Eclipse Public License 2.0 which is available at
+# http://www.eclipse.org/legal/epl-2.0
+#
+# SPDX-License-Identifier: EPL-2.0
+type: object
+description: JSON payload to migrate the definition of a Thing.
+
+properties:
+  thingDefinitionUrl:
+    type: string
+    format: uri
+    description: "The URL of the new Thing definition to be applied."
+    example: "https://models.example.com/thing-definition-1.0.0.tm.jsonld"
+
+  migrationPayload:
+    type: object
+    description: "Optional migration payload with updates to attributes and features."
+    properties:
+      attributes:
+        type: object
+        additionalProperties: true
+        description: "Attributes to be updated in the thing."
+        example:
+          manufacturer: "New Corp"
+          location: "Berlin, main floor"
+      features:
+        type: object
+        additionalProperties:
+          type: object
+          properties:
+            properties:
+              type: object
+              additionalProperties: true
+        description: "Features to be updated in the thing."
+        example:
+          thermostat:
+            properties:
+              status:
+                temperature:
+                  value: 23.5
+                  unit: "DEGREE_CELSIUS"
+
+  patchConditions:
+    type: object
+    description: "Optional conditions to apply the migration only if the existing thing matches the specified values."
+    additionalProperties:
+      type: string
+    example:
+      thing:/features/thermostat: "not(exists(/features/thermostat))"
+
+  initializeMissingPropertiesFromDefaults:
+    type: boolean
+    description: "Flag indicating whether missing properties should be initialized with default values."
+    example: true
+
+required:
+  - thingId
+  - thingDefinitionUrl
+  - migrationPayload

documentation/src/main/resources/pages/ditto/httpapi-concepts.md

@@ -106,6 +106,39 @@ The following additional API endpoints are automatically available:
 * `/things/{thingId}/features/lamp/properties/color`: accessing the `color` properties of the feature `lamp` of the
   specific thing
 
+#### `/things` in API 2 - update-definition
+Migrate Thing Definitions
+The endpoint `/things/{thingId}/migrateDefinition`allows migrating the thing definition with a new model, as well as optionally migrating attributes and features.
+
+HTTP Method: POST /things/{thingId}/migrateDefinition
+Request Example
+```json
+{
+  "thingDefinitionUrl": "https://models.example.com/thing-definition-1.0.0.tm.jsonld",
+  "migrationPayload": {
+    "attributes": {
+      "manufacturer": "New Corp",
+      "location": "Berlin, main floor"
+    },
+    "features": {
+      "thermostat": {
+        "properties": {
+          "status": {
+            "temperature": {
+              "value": 23.5, 
+              "unit": "DEGREE_CELSIUS"
+            }
+          }
+        }
+      }
+    }
+  },
+  "patchConditions": {
+  "thing:/features/thermostat": "not(exists(/features/thermostat))"
+  },
+  "initializeMissingPropertiesFromDefaults": true
+}
+```
 #### `/policies` in API 2
 
 The base endpoint for accessing and working with `Policies`.<br/>