Accessing model has_many property

» ruby-on-rails » Accessing model has_many property

By : amirfarid

Date : November 18 2020, 03:49 PM

hop of those help? It seems at least one of @user.likes doesn't have its associated post. So Like#post returns nil, and on that nil object you try to call title which raises an error. If this situation is not desired, you probably have to validate likes so that every Like has its post:

code :

class Like < ActiveRecord::Base
  # ...
  validate :post, presence: true

class Post < ActiveRecord::Base
  # ...
  has_many :likes, dependent: :destroy

<% @user.likes.joins(:post).each do |i| %>

<%= i.post.try(:title) %>

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has_many :through - Accessing data in the middle model

By : user3754350

Date : March 29 2020, 07:55 AM

Any of those help has_many :through is here a m:n relationship between projects and users. So the question has to be all the time: "Is a user an admin user for a project?"
So your call project.is_admin_user?(@current_user) (in the context of UsersController) is meaningful.

code :

class Project ...
  def is_admin_user?(user)
    user.projectzations.detect{|p| p.project == self && p.admin?} != nil
  end
end

class User ...
  def is_admin_user_for?(project)
    project.is_admin_user?(self)
  end
end

Accessing has_many model records

By : Roman Došek

Date : March 29 2020, 07:55 AM

I wish this helpful for you It seems to me that your you missed something in you migrations. ResumeSection needs to have and integer field called user_id. Just create a new migration that has something like this in it:

code :

def change
    add_column :resume_section, :user_id, :integer
end

Rails 3 accessing has_many through join model in another controller

By : VIKAS KULAWADE

Date : March 29 2020, 07:55 AM

wish helps you I'm doing an online judge application, so I have a User model, a Problem model and a Solution model to make the many to many relation. In that Solution model I have an extra column called "state" where I plan to store the state of a problem for a certain user: solved, wrong anwser, not solved. , Just need to use:

code :

problem.solution.state

problem.solutions.first.state

scope :for_user, lambda {|user_id| :conditions => {:user_id => user_id}}

problem.solutions.for_user(current_user.id).first.state

Accessing has_many objects from model in rails

By : Danny Stones

Date : March 29 2020, 07:55 AM

Hope that helps This was caused due to a stupid mistake of mine as pointed out by ForgetTheNorm in the comments.
I hadn't initialized self.totsal. Adding self.totsal ||= 0.0 at the beginning of function saltotal solved the issue.

Accessing join model attributes in has_many: though relationship

By : tony

Date : March 29 2020, 07:55 AM

fixed the issue. Will look into that further First you need to correct the naming scheme for your models and tables so that they follow the rails conventions.
Run this from the command line: