context.succeed for create? #2

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1. deryl27 commented on May 17, 2016

   

   deryl27

   on May 17, 2016

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   Even I am facing this issue
2. luctus commented on May 19, 2016

   

   luctus

   on May 19, 2016

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   It worked for me. Did you set the permissions to dynamodb?

   😄React with 😄1Reacted by Denny Ku
3. abalone0204 commented on May 20, 2016

   

   abalone0204

   on May 20, 2016

   Last edited by abalone0204

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   @luctus I've faced the same problem.

   I set theAdministratorAccess policy to the IAM user.
   And also modified the s-resources-cf.json: add resources permission to access dynamodb.
   It would very helpful if you could tell me what's wrong with my codes,
   or let us see how it worked on your project.
   I've stuck by this issue for whole day.

   btw, I've posted a question on stackoverflow
4. AlexMcConnell commented on May 20, 2016

   

   AlexMcConnell

   on May 20, 2016

   Author

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   If I were missing permissions, it would return an error instead of just not doing anything. Everything works fine with context.done, just not with context.succeed.
5. abalone0204 commented on May 20, 2016

   

   abalone0204

   on May 20, 2016

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   @AlexMcConnell !
   I just figure it out!
   In the second arguments of the putItem, it should be a callback function,
   but in the example:

    dynamo.putItem(event.payload,context.succeed({"postId":event.payload.Item.postId}));

   It's executed inline..

   So if we change this into

   dynamo.putItem(event.payload, function() {
     context.succeed({"postId":event.payload.Item.postId})
   });

   The context.succeed will be executed after the putItem be done.

   :D Hope this may helpful to you!
6. luctus commented on May 20, 2016

   

   luctus

   on May 20, 2016

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   @abalone0204 I'm kind of new to node, but I was pretty sure that there is no difference between

   dynamo.putItem(event.payload,context.succeed({"postId":event.payload.Item.postId}));

   and

   dynamo.putItem(event.payload, function() {
     context.succeed({"postId":event.payload.Item.postId})
   });

   Am I wrong?
7. abalone0204 commented on May 21, 2016

   

   abalone0204

   on May 21, 2016

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   No, they are absolutely different.

   dynamo.putItem(event.payload, function() {
     context.succeed({"postId":event.payload.Item.postId})
   });

   It's a function declaration in the second argument,
   it will wait for the putItem done then call this function.

   As for this:

    dynamo.putItem(event.payload,context.succeed({"postId":event.payload.Item.postId}));

   context.succeed will be executed in line and return a result to the second argument.

   You can check this link to understand the callback style in JavaScript.

   Or you can just give a try, you will be suprised that it works.
   Btw, you should put some permission into the s-resources-cf.json.
   I've created a similar example, you can check my repo, too