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can't debug TinyBlog in the Pharo MOOC

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can't debug TinyBlog in the Pharo MOOC

hi guys
I'm following the Pharo MOOC and I'm at Week 4. the other day, I was trying
to implement TinyBlog: Data Persistency using Voyage and Mongo, when I tried
to compile the code, I've got an Error. the title of Error says:
"MessageNotUnderstood: receiver of "save:" is nil", and it refers to
TBMBlog>>writeBlogPost.

TBMBlog>>writeBlogPost: aTBMPost
posts add: aTBMPost.
aTBMPost save.
self save .

thanks for your answers!

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Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

EstebanLM

Re: can't debug TinyBlog in the Pharo MOOC

Hi,

You are missing to initialise the Voyage repository.

I don’t know how is explained in the Mooc, but you will probably need to do something like:

VOMemoryRepository new enableSingleton.

Cheers,

Esteban

On 22 Nov 2018, at 17:51, iu136 via Pharo-users <[hidden email]> wrote:

From: iu136 <[hidden email]>
Subject: can't debug TinyBlog in the Pharo MOOC
Date: 22 November 2018 at 17:51:12 CET
To: [hidden email]

hi guys
I'm following the Pharo MOOC and I'm at Week 4. the other day, I was trying
to implement TinyBlog: Data Persistency using Voyage and Mongo, when I tried
to compile the code, I've got an Error. the title of Error says:
"MessageNotUnderstood: receiver of "save:" is nil", and it refers to
TBMBlog>>writeBlogPost.

TBMBlog>>writeBlogPost: aTBMPost
   posts add: aTBMPost.
   aTBMPost save.
   self save .

thanks for your answers!

--
Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Pharo Smalltalk Users mailing list

Re: can't debug TinyBlog in the Pharo MOOC

EstebanLM wrote

> Hi,
>
> You are missing to initialise the Voyage repository.
> I don’t know how is explained in the Mooc, but you will probably need to
> do something like:
>
> VOMemoryRepository new enableSingleton.
>
> Cheers,
> Esteban

Hi Esteban.

actually I'm using an External Mongo database and in the MOOC the
initialization of Voyage Mongo repository, is done like:

TBBlog class >> initializeLocalhostMongoDB
| repository |
repository := VOMongoRepository database: 'tinyblog'.
repository enableSingleton.

TBBlog class >> reset
self initializeLocalhostMongoDB

and in my code I'm doing exactly like above. but interestingly when I wanted
to reset the cache of Voyage by:
VORepository current reset

again I've got another Error saying: "MessageNotUnderstood: receiver of
"reset" is nill".

thanks anyway!

--
Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

EstebanLM

Re: can't debug TinyBlog in the Pharo MOOC

On 22 Nov 2018, at 21:48, iu136 via Pharo-users <[hidden email]> wrote:

From: iu136 <[hidden email]>
Subject: Re: can't debug TinyBlog in the Pharo MOOC
Date: 22 November 2018 at 21:48:52 CET
To: [hidden email]

EstebanLM wrote
Hi,

You are missing to initialise the Voyage repository.
I don’t know how is explained in the Mooc, but you will probably need to
do something like:

VOMemoryRepository new enableSingleton.

Cheers,
Esteban

Hi Esteban.

actually I'm using an External Mongo database and in the MOOC the
initialization of Voyage Mongo repository, is done like:

TBBlog class >> initializeLocalhostMongoDB
   | repository |
   repository := VOMongoRepository database: 'tinyblog'.
   repository enableSingleton.

TBBlog class >> reset
   self initializeLocalhostMongoDB

and in my code I'm doing exactly like above. but interestingly when I wanted
to reset the cache of Voyage by:
    VORepository current reset

again I've got another Error saying: "MessageNotUnderstood: receiver of
"reset" is nill”.

Which again, should means you never executed initializeLocalhostMongoDB method.

Can you try doing:

TBBlock initializeLocalhostMongoDB.

Esteban

thanks anyway!

--
Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Pharo Smalltalk Users mailing list

Re: can't debug TinyBlog in the Pharo MOOC

> Which again, should means you never executed initializeLocalhostMongoDB
> method.
> Can you try doing:
>
> TBBlock initializeLocalhostMongoDB.
>
> Esteban

You were right Esteban, finally I fixed it by manually executing the code
below at Playground:

| repository |
repository := VOMongoRepository database: 'tinyblog'.
repository enableSingleton .

Even thought I was putting the above code at initialize method of TBMBlog,
but I don't know why its never get executed!
Thank you very much for your help!

--
Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

CyrilFerlicot

Re: can't debug TinyBlog in the Pharo MOOC

On Fri, Nov 23, 2018 at 1:25 PM iu136 via Pharo-users
<[hidden email]> wrote:

>
> You were right Esteban, finally I fixed it by manually executing the code
> below at Playground:
>
> | repository |
> repository := VOMongoRepository database: 'tinyblog'.
> repository enableSingleton .
>
> Even thought I was putting the above code at initialize method of TBMBlog,
> but I don't know why its never get executed!

Hi,

Class initialisation methods are executed at loading. If you write the
method the first time it will not execute it by default.

> Thank you very much for your help!
>
>
>
>
> --
> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html
>

--
Cyril Ferlicot
https://ferlicot.fr