Get @current_user into model

rubyonrails-talk
1

Hello, can anybody help me, how to pass @current_user (generated by session[user_id] into a model ? for example I have a relationship like below :

User has many Journals User has many Categories Journals has many Items Items has many Categories

The problem is I like to sum "amount" field in Item model based on category and user. So every user has their own category and their own category amount. So if I want to make a method that return sum of item amount where do I put it anyway ? On this problem I can't make through association cause User and Item doesn't related at all, they only related by journals data.

2

Are you sure you are trying to calculate the totals in the right place? I think the clue may be in the question. You say “every user has their own category and their own category amount” which suggests that the user owns the amounts, so possibly it should be calculated in the user model, where you can get at the users categories and journals and hence the items.

3

Assuming all your associations are setup right, you should be able to do the following.

# in journals controller, this will return the current users journal def show   @journal = @current_user.journals.find( params[:id] ) end

# adding a new journal for the current user # example, instead of doing something like:

@journal = Journal.new( params[:journal] ) if @journal.save ....

You can do the following:

@journal = @current_user.journals.new( params[:journal] ) if @journal.save ...

By using the associations, you'll be able to add associated data to the current user without much extra work.

Hope that helps!

Cheers, Robby

4

Many many thanks Colin i'd never figured it out before to put the calculation in the user model. My previous solution is to

class Item < ActiveRecord::Bas def self.balance_per_mutation(category_id, user)     Item.sum :amount,       :include => :journal,       :conditions => ["journals.user_id = ? and items.category_id = ?", user, category_id]   end end

And I find the solution is very troublesome cause everytime the amount data i need to pass current_user. And forgive me If I'm greedy but i have another problem and actually i think the same problem.

The problem is for autocomplete plugin.. I'm already follow the guide on Ryan Railscasts for autocomplete association but the guide assumption is the category autocomplete is not related at all with user model, so the autocomplete for category is public category.

Now my problem is i want to make autocomplete for category that display only user related category not combining with other user category data. In the comment section of Ryan solution is to make a second virtual att and model callback. I never manage to make it cos the parameter i need to pass is the current_user and really doesn't have any clue at all, but I think the solution is the same as before maybe if i pushed the process into user model, i will achieved it, hmmmm.... wanna try out... I will post if i succeded. Anw thanks Colin

5

What do u mean?

Blog: http://random8.zenunit.com/ Learn rails: http://sensei.zenunit.com/

6

Geekyra,

Interesting.. had the same issue. Put this in application.rb

  around_filter :you_dont_have_bloody_clue

    protected

    def you_dont_have_bloody_clue       klasses = [ActiveRecord::Base, ActiveRecord::Base.class]       methods = ["session", "cookies", "params", "request"]

      methods.each do |shenanigan|         oops = instance_variable_get(:"@_#{shenanigan}")

        klasses.each do |klass|           klass.send(:define_method, shenanigan, proc { oops })         end       end

      yield

      methods.each do |shenanigan|         klasses.each do |klass|           klass.send :remove_method, shenanigan         end       end

    end

--courtesy Pratik Naik (though highly NOT recommended by him)

works like a charm.

7

Very interesting I will try it right away (actually I never done anything to application.rb) and the way u treat it I think it will work, thanks.