I have such code:
def update
#oil = Oil.find(params[:id])
#product_types = ProductType.all
if #oil.update_attributes(params[:oil])
if #oil.other_products_cross_lists.update_attributes(:cross_value => #oil.model.to_s.gsub(/\s+/, "").upcase)
redirect_to admin_oils_path
end
else
render :layout => 'admin'
end
end
but when i run it i get:
undefined method `update_attributes' for #<ActiveRecord::Relation:0x007f7fb4cdc220>
and my other_products_cross_lists isn't updated... Also i try update_attribute and get the same error.
What i do wrong?
Also when i run my destroy method
def destroy
#oil = Oil.find(params[:id])
if #oil.destroy
if #oil.other_products_cross_lists.destroy
redirect_to admin_oils_path
end
else
render :layout => 'admin'
end
end
other_products_cross_lists didn't destroy...
How can i solve this problem?
model:
class Oil < ActiveRecord::Base
has_many :other_products_cross_lists, :foreign_key => 'main_id'
class OtherProductsCrossList < ActiveRecord::Base
belongs_to :oil
other_products_cross_lists is an association on your Oil model.
You cannot use update_attributes on an Array or ActiveRecord:Relation object.
What you should do is
#oil.other_products_cross_lists.each {|list| list.update_attributes(:cross_value => #oil.model.to_s.gsub(/\s+/, "").upcase)}
for destroying
you can use
#oil.other_products_cross_lists.delete_all
or
#oil.other_products_cross_lists.destroy_all
You should check out the difference between delete_all and destroy_all for clarity.
as the error says other_products_cross_lists is a relation (I assume your model oil has_many other_products_cross_lists).
update_attribute is a method of an instance of a model, not a method of a relation.
I don't really understand, what you want to do with you update_attribute, but if user nested_attributes, then
#oil.update_attributes(params[:oil])
takes care of updating the relation.
Also, if you define your relation beween Oil and OtherProducts as dependend: :destroy Rails handles the removel of dependent records.
Related
I am trying to create a realtionship between two nodes as described here
https://github.com/neo4jrb/neo4j/wiki/Neo4j-v3-Declared-Relationships
from_node.create_rel("FRIENDS", to_node)
I am getting an undefined method for create_rel
What am I doing wrong? I am trying to create a Q+A system inside another model. So both Questions and Answers are treated as models right now.
I'm getting a undefined methodcreate_rel' for #
event.rb
has_many :out, :event_questions
event_question.rb
has_one :in, :events
has_many :out, :event_answers
def create_questions_of(from_node,to_node)
from_node.create_rel("questions_of", to_node)
end
event_answer.rb
has_one :in, :event_questions
event_questions_controller.rb
def new
#is this needed
end
def create
#event_question = EventQuestion.new(event_question_params)
if #event_question.save
#event = Event.find(params[:id])
#event_question.update(admin: current_user.facebook_id)
#event_question.create_questions_of(self,#event)
redirect_to #event
else
redirect_to #event
end
end
private
def event_question_params
params.require(:event_question).permit(:question)
end
I have my new question sitting inside the event's index page since I wanted to list all the questions on the event after. I don't even need a new method in my controller right? I also don't really know how I would obtain the event that my question form is sitting on. Is that accessible through params?
UPDATE
Did you mean this
def create_questions_of(to_node)
self.create_rel("questions_of", to_node)
end
and
#event_question.create_questions_of(#event)
So I think I need to change my routes as well and nest questions inside to create
events/123/questions/
Then I can grab events_id and use find
UPDATE #2
events_controller.rb
def show
#event = Event.find(params[:id])
#event_question = EventQuestion.new
end
event.rb
has_many :out, :event_questions, type: 'questions_of'
event_question.rb
has_one :in, :events, origin: :event_questions
events/show.html.erb
<%= form_for [:event, #event_question] do |f| %>
#form stuff
<% end %>
event_questions_controller.rb
def create
#event_question = EventQuestion.new(event_question_params)
if #event_question.save
#event = Event.find(params[:event_id])
#event_question.update(admin: current_user.facebook_id)
#event_question.events << #event
redirect_to #event
else
redirect_to :back
end
end
routes.rb
resources :events do
resources :event_questions, only: [:create, :destroy]
end
create_rel worked fine when I tested it just now. Is it saying undefined method 'create_rel' for nil:NilClass? If so, it means that your from_node variable doesn't actually have a node set. Make sure your objects are what you think they are.
The better question here: why do you want to do this? When you create an undeclared relationship, you have to write your own Cypher queries whenever you want to use it. If it's part of your code and you are using it regularly, it should probably have has_many associations in your models. create_rel really only exists to provide interoperability with nodes that don't have models.
As for your other question, you don't need a new action unless there's a route and a view that corresponds with it. If you're loading the form for a new question on your index page, that's fine. If your URL is something like http://127.0.0.1:3000/events/123/questions/, then you can get the Event ID in params[:event_id]. Run the rake routes command from your project's directory and it'll spit out lots of information that includes the parameter names.
Finally, when you use self in #event_question.create_questions_of(self,#event), you're going to get the controller. If you want it to refer to the #event_question, just remove that first argument from create_questions_of and use self from within the method.
Edit: Part 2
You're getting the undefined method because self in #event_question.create_questions_of(self,#event) is the controller. You're trying to send #event_question to itself, I think. Don't do that, just call self from within create_questions_of and you'll get current EventQuestion.
You use ActiveRel if you want callbacks, validations, properties, etc,... If you just want a simple relationships, just setup the has_many associations in each model, omit rel_class, and either set them both to the same type or set origin on one.
class Event
include Neo4j::ActiveNode
has_many :in, :event_questions, type: 'questions_of'
end
class EventQuestion
include Neo4j::ActiveNode
has_many :out, :events, origin: :event_questions
end
origin says, "Look for this association in the reciprocal model and use the type it defines." It lets you not have to worry about synchronizing the type between associations.
After that, you can do #event_question.events << #event and it'll create a new relationship for you.
Why is this undefined? Does it have something to do with the #current_user?
I'm trying to create tasks for my challenges. And the created task should get /achievements. However, I get a GET 500 error.
This is the error I get:
NoMethodError at /achievements
==============================
> undefined method `achievements' for #<User:0x00000105140dd8>
app/controllers/achievements_controller.rb, line 5
--------------------------------------------------
``` ruby
1 class AchievementsController < ApplicationController
2
3
4 def index
> 5 #achievements = #current_user.achievements
6 render :json => #achievements
7 end
8
9 def new 10 #achievement = Achievement.new
This is my code in my controller
class AchievementsController < ApplicationController
def index
#achievements = #current_user.achievements
render :json => #achievements
end
def new
#achievement = Achievement.new
render :json => #achievement
end
#create a new achievment and add it to the current user
#check then set the acheivments pub challenge id to the current pub challenge
def create
#achievement = Achievement.new achievement_params
#achievement.user = #current_user.id
#achievement.pub_challenge = params[:id]
if #achievement.save
# render :json => #achievement #{ status: 'ok'}
else
render :json => {:errors => #achievement.errors}
end
end
def show
#achievement = Achievement.find params[:id]
render :json => #achievement
end
def destroy
#achievement = Achievement.find params[:id]
#achievement.destroy
end
private
def achievement_params
params.require(:achievement).permit(:pub_challenges)
end
end
You are missing the has_many :achievements relation in your User model.
You'll need to create the ActiveRecord associations you require:
#app/models/user.rb
class User < ActiveRecord::Base
has_many :achievements
end
#app/models/achievement.rb
class Achievement < ActiveRecord::Base
belongs_to :user
end
This will give you the ability to call the achievements method on any User objects you have.
Error
The error you have is described as such:
undefined method `achievements' for #<User:0x00000105140dd8>
This basically means that you're trying to call an undefined method on a User object. Might sound simple, but really, most people don't understand it.
To explain properly, you have to remember that Rails, by virtue of being built on Ruby is object orientated. This means that everything you do in Rails should be structured around objects - which are defined in your Models:
This means that each time you call an object, you're actually above to invoke a series of "methods" which will give you the ability to either manipulate the object itself, or any of the associated functionality it has.
The problem you have is that your User object doesn't have the achievements method. Whilst you could simply do the following to fix the issue, because it's Rails, you'll need to populate the record with associative data:
#app/models/user.rb
class User < ActiveRecord::Base
has_many :achievements #-> what you need
def achievements
#this will also fix the error you see, although it's fundamentally incorrect
end
end
Something that helped me with this type of error was that the database table was missing the relevant column. Adding the required column to the database fixed the issue.
I have a attachment model and controller for al my images on the site.
The relations are (polymorphic):
class House
has_many :attachments, :as => :attachable
end
class Apartment
has_many :attachments, :as => :attachable
end
The attachment controller looks like this to store the right variables.
class AttachmentController
#appartment = Appartment.find(params[:apartment_id])
#attachments = #appartment.attachments
end
this works on the apartment page/path. (apartment/1/assets) But on the house page (house/1/assets) I got the error message "Couldn't find Appartment without an ID"
How can I deal with this/best approach ? Conditions in the controller?
You'll need to check which keys are present first, something like this:
class AttachmentController
before_filter :prepare_attachable
def index
#attachments = #attachable.attachments
end
private
def prepare_attachable
if params.kas_key?(:apartment_id)
#attachable = Apartment.where(:id => params[:apartment_id]).first
elsif params.kas_key?(:house_id)
#attachable = House.where(:id => params[:house_id]).first
end
raise ActiveRecord::RecordNotFound if #attachable.blank?
end
end
Possible problem...
"Appartment" vs Apartment
I have an (I think) relatively straightforward has_many :through relationship with a join table:
class User < ActiveRecord::Base
has_many :user_following_thing_relationships
has_many :things, :through => :user_following_thing_relationships
end
class Thing < ActiveRecord::Base
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
end
class UserFollowingThingRelationship < ActiveRecord::Base
belongs_to :thing
belongs_to :user
end
And these rspec tests (I know these are not necessarily good tests, these are just to illustrate what's happening):
describe Thing do
before(:each) do
#user = User.create!(:name => "Fred")
#thing = Thing.create!(:name => "Foo")
#user.things << #thing
end
it "should have created a relationship" do
UserFollowingThingRelationship.first.user.should == #user
UserFollowingThingRelationship.first.thing.should == #thing
end
it "should have followers" do
#thing.followers.should == [#user]
end
end
This works fine UNTIL I add an after_save to the Thing model that references its followers. That is, if I do
class Thing < ActiveRecord::Base
after_save :do_stuff
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
def do_stuff
followers.each { |f| puts "I'm followed by #{f.name}" }
end
end
Then the second test fails - i.e., the relationship is still added to the join table, but #thing.followers returns an empty array. Furthermore, that part of the callback never gets called (as if followers is empty within the model). If I add a puts "HI" in the callback before the followers.each line, the "HI" shows up on stdout, so I know the callback is being called. If I comment out the followers.each line, then the tests pass again.
If I do this all through the console, it works fine. I.e., I can do
>> t = Thing.create!(:name => "Foo")
>> t.followers # []
>> u = User.create!(:name => "Bar")
>> u.things << t
>> t.followers # [u]
>> t.save # just to be super duper sure that the callback is triggered
>> t.followers # still [u]
Why is this failing in rspec? Am I doing something horribly wrong?
Update
Everything works if I manually define Thing#followers as
def followers
user_following_thing_relationships.all.map{ |r| r.user }
end
This leads me to believe that perhaps I am defining my has_many :through with :source incorrectly?
Update
I've created a minimal example project and put it on github: https://github.com/dantswain/RspecHasMany
Another Update
Thanks a ton to #PeterNixey and #kikuchiyo for their suggestions below. The final answer turned out to be a combination of both answers and I wish I could split credit between them. I've updated the github project with what I think is the cleanest solution and pushed the changes: https://github.com/dantswain/RspecHasMany
I would still love it if someone could give me a really solid explanation of what is going on here. The most troubling bit for me is why, in the initial problem statement, everything (except the operation of the callback itself) would work if I commented out the reference to followers.
I've had similar problems in the past that have been resolved by reloading the association (rather than the parent object).
Does it work if you reload thing.followers in the RSpec?
it "should have followers" do
#thing.followers.reload
#thing.followers.should == [#user]
end
EDIT
If (as you mention) you're having problems with the callbacks not getting fired then you could do this reloading in the object itself:
class Thing < ActiveRecord::Base
after_save { followers.reload}
after_save :do_stuff
...
end
or
class Thing < ActiveRecord::Base
...
def do_stuff
followers.reload
...
end
end
I don't know why RSpec has issues with not reloading associations but I've hit the same types of problems myself
Edit 2
Although #dantswain confirmed that the followers.reload helped alleviate some of the problems it still didn't fix all of them.
To do that, the solution needed a fix from #kikuchiyo which required calling save after doing the callbacks in Thing:
describe Thing do
before :each do
...
#user.things << #thing
#thing.run_callbacks(:save)
end
...
end
Final suggestion
I believe this is happening because of the use of << on a has_many_through operation. I don't see that the << should in fact trigger your after_save event at all:
Your current code is this:
describe Thing do
before(:each) do
#user = User.create!(:name => "Fred")
#thing = Thing.create!(:name => "Foo")
#user.things << #thing
end
end
class Thing < ActiveRecord::Base
after_save :do_stuff
...
def do_stuff
followers.each { |f| puts "I'm followed by #{f.name}" }
end
end
and the problem is that the do_stuff is not getting called. I think this is the correct behaviour though.
Let's go through the RSpec:
describe Thing do
before(:each) do
#user = User.create!(:name => "Fred")
# user is created and saved
#thing = Thing.create!(:name => "Foo")
# thing is created and saved
#user.things << #thing
# user_thing_relationship is created and saved
# no call is made to #user.save since nothing is updated on the user
end
end
The problem is that the third step does not actually require the thing object to be resaved - its simply creating an entry in the join table.
If you'd like to make sure that the #user does call save you could probably get the effect you want like this:
describe Thing do
before(:each) do
#thing = Thing.create!(:name => "Foo")
# thing is created and saved
#user = User.create!(:name => "Fred")
# user is created BUT NOT SAVED
#user.things << #thing
# user_thing_relationship is created and saved
# #user.save is also called as part of the addition
end
end
You may also find that the after_save callback is in fact on the wrong object and that you'd prefer to have it on the relationship object instead. Finally, if the callback really does belong on the user and you do need it to fire after creating the relationship you could use touch to update the user when a new relationship is created.
UPDATED ANSWER **
This passes rspec, without stubbing, running callbacks for save (after_save callback included ), and checks that #thing.followers is not empty before trying to access its elements. (;
describe Thing do
before :each do
#user = User.create(:name => "Fred");
#thing = Thing.new(:name => 'Foo')
#user.things << #thing
#thing.run_callbacks(:save)
end
it "should have created a relationship" do
#thing.followers.should == [#user]
puts #thing.followers.inspect
end
end
class Thing < ActiveRecord::Base
after_save :some_function
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
def some_function
the_followers = followers
unless the_followers.empty?
puts "accessing followers here: the_followers = #{the_followers.inspect}..."
end
end
end
ORIGINAL ANSWER **
I was able to get things to work with the after_save callback, so long as I did not reference followers within the body / block of do_stuff. Do you have to reference followers in the real method you are calling from after_save ?
Updated code to stub out callback. Now model can remain as you need it, we show #thing.followers is indeed set as we expected, and we can investigate the functionality of do_stuff / some_function via after_save in a different spec.
I pushed a copy of the code here: https://github.com/kikuchiyo/RspecHasMany
And spec passing thing* code is below:
# thing_spec.rb
require 'spec_helper'
describe Thing do
before :each do
Thing.any_instance.stub(:some_function) { puts 'stubbed out...' }
Thing.any_instance.should_receive(:some_function).once
#thing = Thing.create(:name => "Foo");
#user = User.create(:name => "Fred");
#user.things << #thing
end
it "should have created a relationship" do
#thing.followers.should == [#user]
puts #thing.followers.inspect
end
end
# thing.rb
class Thing < ActiveRecord::Base
after_save :some_function
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
def some_function
# well, lets me do this, but I cannot use #x without breaking the spec...
#x = followers
puts 'testing puts hear shows up in standard output'
x ||= 1
puts "testing variable setting and getting here: #{x} == 1\n\t also shows up in standard output"
begin
# If no stubbing, this causes rspec to fail...
puts "accessing followers here: #x = #{#x.inspect}..."
rescue
puts "and this is but this is never seen."
end
end
end
My guess is that you need to reload your Thing instance by doing #thing.reload (I'm sure there's a way to avoid this, but that might get your test passing at first and then you can figure out where you've gone wrong).
Few questions:
I don't see you calling #thing.save in your spec. Are you doing that, just like in your console example?
Why are you calling t.save and not u.save in your console test, considering you're pushing t onto u? Saving u should trigger a save to t, getting the end result you want, and I think it would "make more sense" considering you are really working on u, not t.
Ok, im new to ruby and rails, I cant seem to get which I would assume to be simple working. Basically my code is to remove a reference to an association (nil it).
I want to get the name member (Team.name) of the model and save it to (team_name) before removing the association for the flash message.
Here is the controller action and Models:
def remove_resource
...
#user = User.find(params[:user_id])
team_name = #user.team.name
#user.team = nil
if #user.save
flash[:notice] = "#{#user.name} was removed from "+team_name+". They are no longer on a team."
...
end
...
end
class Team < ActiveRecord::Base
has_many :user, :class_name => "User", :foreign_key => "user_id",
:order => "team_start"
...
def ==(another_team)
if self.name != another_team.name then
return false
end
if self.location != another_team.location then
return false
end
...
true
end
...
end
class User < ActiveRecord::Base
belongs_to :team, :class_name => "Team",
:foreign_key => "team_id"
...
end
The Errors I am receiving:
NoMethodError in UsersController#remove_resource
undefined method `name' for nil:NilClass
The trace:
app/models/user.rb:50:in `=='
app/controllers/teams_controller.rb:50:in `remove_resource'
Now the error only occurs when I retrieve the
#user.team.name
If I delete this and the reference to the variable team_name, all works fine.
Thanks!
You get this error because you dont have the #user.team associated anymore. There is only a nil which doesnt have the Model specific method name. So you need to validate if threre is a team associated or not before executing methods of a associated object that may not be there.
def remove_resource
...
#user = User.find(params[:user_id])
if #user.team.nil? # Check if theres a associated object
#do sth. when theres no team to remove
else
team_name = #user.team.name
#user.team = nil
if #user.save
flash[:notice] = "#{#user.name} was removed from "+team_name+". They are no longer on a team."
...
end
...
end