add example mutation, insertArtist, in fixtures

fixtures/connector/chinook/native_queries/hello.yaml

@@ -1,4 +1,5 @@
 name: hello
+description: Example of a read-only native query
 objectTypes:
   - name: HelloResult
     fields:

fixtures/connector/chinook/native_queries/insert_artist.yaml

@@ -0,0 +1,16 @@
+name: insertArtist
+description: Example of a database update using a native query
+objectTypes:
+  - name: InsertArtist
+    fields:
+      - name: ok
+        type: !scalar int
+      - name: n
+        type: !scalar int
+resultType: !object InsertArtist
+# TODO: implement arguments instead of hard-coding inputs
+command:
+  insert: "Artist"
+  documents:
+    - ArtistId: 1001
+    - Name: Regina Spektor

fixtures/ddn/subgraphs/chinook/commands/InsertArtist.hml

@@ -0,0 +1,54 @@
+kind: Command
+version: v1
+definition:
+  name: insertArtist
+  description: Example of a database update using a native query
+  outputType: InsertArtist
+  arguments: []
+  source:
+    dataConnectorName: mongodb
+    dataConnectorCommand:
+      procedure: insertArtist
+    typeMapping:
+      InsertArtist:
+        fieldMapping:
+          ok: { column: ok }
+          n: { column: n }
+  graphql:
+    rootFieldName: insertArtist
+    rootFieldKind: Mutation
+
+---
+kind: CommandPermissions
+version: v1
+definition:
+  commandName: insertArtist
+  permissions:
+    - role: admin
+      allowExecution: true
+
+---
+kind: ObjectType
+version: v1
+definition:
+  name: InsertArtist
+  graphql:
+    typeName: InsertArtist
+  fields:
+    - name: ok
+      type: Int!
+    - name: n
+      type: Int!
+
+---
+kind: TypePermissions
+version: v1
+definition:
+  typeName: InsertArtist
+  permissions:
+    - role: admin
+      output:
+        allowedFields:
+          - ok
+          - n
+

fixtures/ddn/subgraphs/chinook/dataconnectors/mongodb.hml

@@ -911,6 +911,12 @@ definition:
               type: { type: named, name: Int }
             readOnly:
               type: { type: named, name: Boolean }
+        InsertArtist:
+          fields:
+            ok:
+              type: { type: named, name: Int }
+            n:
+              type: { type: named, name: Int }
       collections:
         - name: Album
           arguments: {}
@@ -1002,10 +1008,16 @@ definition:
           foreign_keys: {}
       functions:
         - name: hello
+          description: Example of a read-only native query
           result_type: { type: named, name: HelloResult } 
           arguments: {}
           command: { hello: 1 }
-      procedures: []
+      procedures:
+        - name: insertArtist
+          description: Example of a database update using a native query
+          result_type: { type: named, name: InsertArtist }
+          arguments: {}
+          command: { insert: Artist, documents: [{ ArtistId: 1001, Name: Regina Spektor }] }
     capabilities:
       version: ^0.1.0
       capabilities: