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:readonly key of belongs_to method doesn't work


:readonly key of belongs_to method doesn't work

By : user2955156
Date : November 22 2020, 10:38 AM
it fixes the issue I try to use :readonly key as it described in documentation: , The documentation is out of date. The up to date equivalent is
code :
User.belongs_to :feed, -> {readonly}, inverse_of: articles


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Why doesn't :readonly => true work on a belongs_to association?

Why doesn't :readonly => true work on a belongs_to association?


By : user3221543
Date : March 29 2020, 07:55 AM
will help you I have the following model: , From the doc,
code :
:readonly
    If true, the associated object is readonly through the association.
question.user.name = 'Hacked'
Exception Handling + polymorphism, doesnt work if the exception method, doesnt work in the same class

Exception Handling + polymorphism, doesnt work if the exception method, doesnt work in the same class


By : kevin43213341
Date : March 29 2020, 07:55 AM
like below fixes the issue Because an object is copied before thrown.
Even if the parameter a of foo points to an instance of B at run-time, what matters is the compile-time type of the throw expression. So, effectively, the instance of B is passed to the copy-constructor of A (which is legitimate since B inherits A) and a new A instance created and then thrown.
Rails has_many :through, null belongs_to, multiple belongs_to and deletion of belongs_to?

Rails has_many :through, null belongs_to, multiple belongs_to and deletion of belongs_to?


By : Rodnei Alves
Date : March 29 2020, 07:55 AM
this will help Your associations are fine, and you can have null belongs_to fields. Rails does not create foreign-key constraints on the database by default. As far as the CanCan setup goes, I would do something like:
code :
class Ability
  include CanCan::Ability

  def initialize(user)
    #Adding can rules do not override prior rules, but instead are logically or'ed.
    #See: https://github.com/ryanb/cancan/wiki/Ability-Precedence

    #Anything that you can pass to a hash of conditions in Active Record will work here.
    #The only exception is working with model ids. 
    #You can't pass in the model objects directly, you must pass in the ids.
    #can :manage, Project, :group => { :id => user.group_ids }
    #See https://github.com/ryanb/cancan/wiki/Defining-Abilities

    can :read, Event, network: {id: user.supervises_network_ids} 
    can :manage, Event, role: {id: user.role_ids}
    can :manage, Event, network: {id: user.manages_network_ids + user.admins_network_ids}
  end
end
class User < ActiveRecord::Base
  #...
  def manages_network_ids
    @manages_network_ids ||= roles.manager.collect &:network_id
  end

  def admins_network_ids
    @admins_network_ids ||= roles.admin.collect &:network_id
  end

  def supervises_network_ids
    @supervises_network_ids ||= roles.supervisor.collect &:network_id
  end
  #...
end
class Role < ActiveRecord::Base
  #...
  scope :manager, where(position: "manager")
  scope :admin, where(position: "admin")
  scope :supervisor, where(position: "supervisor")
  #...
end
why the method doesnt work?

why the method doesnt work?


By : user3330044
Date : March 29 2020, 07:55 AM
this will help The problem is that the root node is passed to the add method by value and not by reference. Java passes objects by value and not by reference. Check out the link below for further explantion Is Java "pass-by-reference" or "pass-by-value"?.
Modify the add methods of your code as follows
code :
public void add(int num) {
    root = add(num, root);
}

private Node add(int num, Node t) {
    if (t == null)
        return t = new Node(num);
    else if (t.getLeftSon() == null)
        t.setLeftSon(new Node(num));
    else if (t.getRightSon() == null)
        t.setRightSon(new Node(num));
    else if (Math.abs(height(t.getLeftSon()) - height(t.getRightSon())) <= 1)
        t.setLeftSon(add(num, t.getLeftSon()));
    else
         t.setRightSon(add(num, t.getRightSon()));
    return t;
}
My firewall icon doesnt work.....I have tried setting up the JAVA path but for some reason, it doesnt work

My firewall icon doesnt work.....I have tried setting up the JAVA path but for some reason, it doesnt work


By : rooeye
Date : March 29 2020, 07:55 AM
this one helps. Your PATH may contain spaces. First, properly quote it. And, you might have another jdk earlier in the PATH (so set it first). Something like
code :
set "PATH=c:\amir\jdk1.7.0_45\bin;%PATH%"
cd c:\myutilities\auth
java -jar auth.jar
@echo off
setlocal
set "PATH=c:\amir\jdk1.7.0_45\bin;%PATH%"
java -jar c:\myutilities\auth\auth.jar
endlocal
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