Re: [Rails] Retweet Function

[Colin Law]

On 17 April 2012 13:35, Marcos Korody <mfko...@gmail.com> wrote:
> Hello, good day!
>
> This is a rather intricate question coming from a not so experienced ruby on
> rails user. Let's get to it:
>
> I am developing an app that has users, authors, microposts and tags. I want
> to implement something like a retweet button for the microposts:
>
> The task is simple:
> Get the params of a micropost(original user, original author, original tags)
> "Retweet" it to my own wall, using these params, but also with my own
> user_id embedded in it.
>
> So far I managed to "retweet" it, but there is one problem. As it is now, I
> am copying all the params and creating a new micropost with these params.
> As this creates exact duplicate, I would like to know what would be the best
> approach to implement this function without creating replicas all over my
> app.

Think about the objects and relationships. You want a user to have
many retweets (which are microposts) and a micropost must not only
have its original owner but also users who have retweeted it.

You have not told us the relationships at the moment but I assume that
it is something like user has_many microposts and micropost belongs_to
user. This does not quite match what you have as you have author_id
but presumably you can sort that bit out.

I would suggest using a join table possibly called retweetings where
user has_many retweetings and user has_many retweets through
retweetings. Also micropost has_many retweetings and has_many
retweeters through retweetings.

Then for retweetings you just need retweeter_id and retweet_id and
have retweetings belongs_to :retweeter, :class_name => "user" and
belongs_to :retweet, :class_name => "micropost"

You probably need the class_name spec on the has_many through relationships too.

Looking back at the post you seem to have authors and users in
different tables. Are you sure that is right, what is the difference
between an author and a user?

Colin

>
> Here's the codes:
>
> ROUTES.rb
>
> resources :microposts do
>     member do
>       get :retweet
>     end
>   end
>
>
> MICROPOSTS_CONTROLLER.rb
>
>   def retweet
>     original_micropost = Micropost.find(params[:id])
>     if original_micropost
>       new_micropost = current_user.microposts.build(content:
> original_micropost.content, author_id: original_micropost.author_id)
>       if new_micropost.save
>         redirect_to user_path(current_user)
>         flash[:success] = "Retweet Successful"
>       else
>         redirect_to user_path(current_user), notice:
> new_micropost.errors.full_messages
>       end
>     else
>       redirect_back_or current_user
>       flash[:error] = "Retweet error!"
>     end
>   end
>
>
>
> _MICROPOST.html.erb
>
> <%= link_to (image_tag "retweet.png"), reaspas_micropost_path(micropost) %>
>
>
>
> Let me know if there is anything else needed to get around this.
>
> Thank you in advance.
>
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[Colin Law]

I meant to say have a look at the Rails Guide on ActiveRecord
Associations for some background data on this if you do not understand
what I mean.

Colin

[Marcos Korody]

Hello Colin, good day!

Thank you for your prompt response.

I am sorry if I failed to provide some basic information.

Ur assumptions were right:

USER has_many MICROPOSTS

MICROPOST belongs_to USER

The relations are exactly the same for author. My app has Users and Authors and they do live in two different tables.

It is a Quotation app, so Authors are famous people and Users are normal people. 

Even though the tables are pretty much the same, they have security differences. 

Any given user could create an Author Profile which has attributes that are accessible to any other user to change. And of course, this does not happen in the user's table.

I understand the Join table approach. Will dig deeper through this way and will get back to you with more updates.

Thanks again!

[Marcos Korody]

Hey Collin! Good day!

I managed to implement the functionality I was seeking through a join model.

Thanks for your inputs!

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[Marcos Korody]

Hello Tariq, and whoever it may concern.

I've implemented this using a join model, which we can call Reposts, that has its id, an author_id and a post_id. 

In my app:

- Author has many Posts.
- Post belongs to Author and has many Reposts.
- Repost belongs to Post and belongs to Author

Then, we can create the Reposts, straight from the Post view, with a form calling for the create method in the Reposts Controller.

def create

  @post = Post.find_by(id: params[:post_id])

  current_user.recite!(@post)

  respond_with(@repost)

end

Here, I'm calling the recite! method from the Author model.

def recite!(post)

  reposts.create!(post_id: post.id)

end

And that's it.
Please note this code is still undercooked and under test.

Cheers!

Em domingo, 26 de agosto de 2012 20h17min50s UTC-3, T Tariq escreveu:

Hey Marcos,

I was wondering if you could share the code you added for the retweet function. I am looking to do the exact same, but am a bit stuck. thank you

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