provide information of the observing status of the post after creating a comment (#8310)

backend/src/schema/resolvers/comments.ts

@@ -100,6 +100,14 @@ export default {
         author: '<-[:WROTE]-(related:User)',
         post: '-[:COMMENTS]->(related:Post)',
       },
+      count: {
+        postObservingUsersCount:
+          '-[:COMMENTS]->(:Post)<-[obs:OBSERVES]-(related:User) WHERE obs.active = true AND NOT related.deleted AND NOT related.disabled',
+      },
+      boolean: {
+        isPostObservedByMe:
+          'MATCH (this)-[:COMMENTS]->(:Post)<-[obs:OBSERVES]-(related:User {id: $cypherParams.currentUserId}) WHERE obs.active = true RETURN COUNT(related) >= 1',
+      },
     }),
   },
 }

backend/src/schema/resolvers/observePosts.spec.ts

@@ -22,6 +22,8 @@ const createCommentMutation = gql`
   mutation ($id: ID, $postId: ID!, $content: String!) {
     CreateComment(id: $id, postId: $postId, content: $content) {
       id
+      isPostObservedByMe
+      postObservingUsersCount
     }
   }
 `
@@ -122,11 +124,20 @@ describe('observing posts', () => {
     })
 
     it('has another user observing the post AFTER commenting it', async () => {
-      await mutate({
+      await expect(
-        mutation: createCommentMutation,
+        mutate({
-        variables: {
+          mutation: createCommentMutation,
-          postId: 'p2',
+          variables: {
-          content: 'After commenting the post, I should observe the post automatically',
+            postId: 'p2',
+            content: 'After commenting the post, I should observe the post automatically',
+          },
+        }),
+      ).resolves.toMatchObject({
+        data: {
+          CreateComment: {
+            isPostObservedByMe: true,
+            postObservingUsersCount: 2,
+          },
         },
       })
 
@@ -187,12 +198,21 @@ describe('observing posts', () => {
 
     describe('comment the post again', () => {
       it('does NOT alter the observation state', async () => {
-        await mutate({
+        await expect(
-          mutation: createCommentMutation,
+          mutate({
-          variables: {
+            mutation: createCommentMutation,
-            postId: 'p2',
+            variables: {
-            content:
+              postId: 'p2',
-              'After commenting the post I do not observe again, I should NOT observe the post',
+              content:
+                'After commenting the post I do not observe again, I should NOT observe the post',
+            },
+          }),
+        ).resolves.toMatchObject({
+          data: {
+            CreateComment: {
+              isPostObservedByMe: false,
+              postObservingUsersCount: 1,
+            },
           },
         })
 

backend/src/schema/types/type/Comment.gql

@@ -47,6 +47,12 @@ type Comment {
   updatedAt: String
   deleted: Boolean
   disabled: Boolean
+  isPostObservedByMe: Boolean!
+    @cypher(
+      statement: "MATCH (this)-[:COMMENTS]->(:Post)<-[obs:OBSERVES]-(u:User {id: $cypherParams.currentUserId}) WHERE obs.active = true RETURN COUNT(u) >= 1"
+  )
+  postObservingUsersCount: Int! 
+    @cypher(statement: "MATCH (this)-[:COMMENTS]->(:Post)<-[obs:OBSERVES]-(u:User) WHERE obs.active = true AND NOT u.disabled = true AND NOT u.deleted = true RETURN COUNT(DISTINCT u)")
 }
 
 type Query {

webapp/graphql/Fragments.js

@@ -135,5 +135,7 @@ export const commentFragment = gql`
     deleted
     content
     contentExcerpt
+    isPostObservedByMe
+    postObservingUsersCount
   }
 `