Rails: how to pass a url parameter?

Question

I need to pass the url for each post into user model so it can be shared to twitter. Right now I can pass attributes of the post, such as title and content, which is shared to twitter, but I can't seem to figure out how to pass the post url. Thanks in advance.

post.rb

after_commit :share_all

def share_all
 if user.authentications.where(:provider => 'twitter').any?
  user.twitter_share(self)
 end
end

user.rb

def twitter_share(post) 
 twitter.update("#{post.title}, #{post.content}")           #<--- this goes to twitter feed 
end

Community · Accepted Answer · 2017-05-23 12:03:12Z

1

I haven't tried or tested it but I guess you can do something like:

def share_all
 if user.authentications.where(:provider => 'twitter').any?
  user.twitter_share(title, content, post_url(self, :host => "your_host"))
 end
end

Prior to that, in your model add this:

include ActionController::UrlWriter

This will make the url helper available in your model as well. You can read this to get more information about it.

Please try this as well (found it on this page again):

Rails.application.routes.url_helpers.post_url(self, :host => "your_host")

[EDIT]

I have just read your gist, what you should do is this instead:

## posts.rb
  after_commit :share_all
  def share_all
     # note that I am using self inside the method not outside it.
     url =  Rails.application.routes.url_helpers.post_url(self, :host => "localhost:3000")
     if user.authentications.where(:provider => 'twitter').any?
        user.twitter_share(url)  
    end
  end

Or:

  include ActionController::UrlWriter #very important if you use post_url(..) directly
  after_commit :share_all
  def share_all
     # if you use the url helper directly you need to include ActionController::UrlWriter
     url =  post_url(self, :host => "localhost:3000")
     if user.authentications.where(:provider => 'twitter').any?
        user.twitter_share(url)  
    end
  end

It is very important that you get that url inside the share_all method and not outside it, because self has not the same value whether it's inside or outside. When it's inside the method, self references the instance of Post on which the share_all method is called. When it's outside it's the class Post itself.

I have tested those two variants and they work just well :).

edited May 23, 2017 at 12:03

CommunityBot

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answered Apr 16, 2011 at 19:45

Amokrane Chentir

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7 Comments

trying_hal9000 Over a year ago

I get an undefined method post_url for #<Post:0x000001041c8040>

Amokrane Chentir Over a year ago

Ahh sorry for this. Of course it's undefined, the url helper is only available for the views. See my edit that should be ok now.

trying_hal9000 Over a year ago

Thanks for the help, it says I need a :host set so I tried using this Rails.application.routes.url_helpers.posts_url(:host => "example.com") but I get a routing error no route matches action destroy posts controller

Amokrane Chentir Over a year ago

Ok, test done :). This "WILL" work: Rails.application.routes.url_helpers.post_url(self, :host => "localhost:3000"). Don't put the 's' at the end of post. (so it's post_url not postS_url).

trying_hal9000 Over a year ago

I'm getting undefined method for post_url again, I have it just like you say, here's my code gist.github.com/923619

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