limit votes to 1 per user

Author: nikolasburk

src/components/CreateLink.js

@@ -52,11 +52,9 @@ class CreateLink extends Component {
         postedById
       },
       update: (store, { data: { createLink } }) => {
-
         const first = LINKS_PER_PAGE
         const skip = 0
-        const orderBy = "createdAt_DESC"
-
+        const orderBy = 'createdAt_DESC'
         const data = store.readQuery({
           query: ALL_LINKS_QUERY,
           variables: { first, skip, orderBy }
@@ -92,6 +90,9 @@ const CREATE_LINK_MUTATION = gql`
       }
       votes {
         id
+        user {
+          id
+        }
       }
     }
   }

src/components/Link.js

@@ -7,7 +7,6 @@ class Link extends Component {
   render() {
 
     const userId = localStorage.getItem(GC_USER_ID)
-    console.log(`Link - userId:`, userId)
     return (
       <div>
         {userId && <div onClick={() => this._voteForLink()}>▲</div>}
@@ -18,8 +17,14 @@ class Link extends Component {
   }
 
   _voteForLink = async () => {
-    const linkId = this.props.link.id
     const userId = localStorage.getItem(GC_USER_ID)
+    const voterIds = this.props.link.votes.map(vote => vote.user.id)
+    if (voterIds.includes(userId)) {
+      console.log(`User (${userId}) already voted for this link.`)
+      return
+    }
+
+    const linkId = this.props.link.id
     await this.props.createVoteMutation({
       variables: {
         userId,
@@ -40,8 +45,14 @@ const CREATE_VOTE_MUTATION = gql`
       link {
         votes {
           id
+          user {
+            id
+          }
         }
       }
+      user {
+        id
+      }
     }
   }
 `

src/components/LinkList.js

@@ -38,8 +38,7 @@ class LinkList extends Component {
             <button onClick={() => {
               localStorage.removeItem(GC_USER_ID)
               localStorage.removeItem(GC_AUTH_TOKEN)
-              this.forceUpdate()
-              {/*this.setState({})*/}
+              this.forceUpdate() // doesn't work as it should :(
             }}>Logout</button>
           </div>
         }
@@ -133,8 +132,14 @@ class LinkList extends Component {
                 }
                 votes {
                   id
+                  user {
+                    id
+                  }
                 }
               }
+              user {
+                id
+              }
             }
           }
         }
@@ -197,6 +202,9 @@ export const ALL_LINKS_QUERY = gql`
       }
       votes {
         id
+        user {
+          id
+        }
       }
     }
     _allLinksMeta {