Update route in rails doesn't respond well to after_action? - ruby-on-rails

class FrogsController < ApplicationController
before_action :find_frog, only: [:edit, :update, :show, :destroy]
after_action :redirect_home, only: [:update, :create, :destroy]
def index
#frogs = Frog.all
end
def new
#ponds = Pond.all
#frog = Frog.new
end
def create
#frog = Frog.create(frog_params)
end
def edit
#ponds = Pond.all
end
def update
#frog.update_attributes(frog_params)
end
def show
end
def destroy
#frog.destroy
end
private
def find_frog
#frog = Frog.find(params[:id])
end
def frog_params
params.require(:frog).permit(:name, :color, :pond_id)
end
def redirect_home
redirect_to frogs_path
end
end
Hi all. I was wondering if someone could explain to me why the update route in rails can't take my after_action of redirecting (custom made method on the bottom) it home. The error that I get when i include update in the after_action is "Missing template frogs/update".
This is going to cause me to manually add a redirect_to frogs_path inside the update method.
thanks!

The after_action callback is triggered after the action has run its course. You cannot use it to render or redirect. Do that within the action itself by calling the method:
def update
...
redirect_home
end

Related

What's the "rails way" to access a resource in a controller's before_action

I'm using Pundit to authorize actions in my controllers. My first try was to authorize the model in an after_action hoook:
class CompaniesController < InheritedResources::Base
after_action :authorize_company, except: :index
def authorize_company
authorize #company
end
This let me use the default controller actions which define #company so I wouldn't hit the database twice. But, this is bad for destructive actions because it's going to not authorize the action after I've already messed up the database.
So, I've changed to using a before_action hook:
class CompaniesController < InheritedResources::Base
before_action :authorize_company, except: :index
def authorize_company
#company = Company.find(params.require(:id))
authorize #company
end
Now, I'm not allowing unauthorized people to delete resources, etc... but I'm hitting the database twice. Is there anyway to access #company without hitting the database twice?
Since your asking for the "rails way" this is how you would set this up in "plain old rails" without InheritedResources.
class CompaniesController < ApplicationController
before_action :authorize_company, except: [:new, :index]
def new
#company = authorize(Company.new)
end
def index
#companies = policy_scope(Company)
end
# ...
private
def authorize_company
#company = authorize(Company.find(params[:id]))
end
end
If you really want to use callbacks you would do it like so:
class CompaniesController < ApplicationController
before_action :authorize_company, except: [:new, :index]
before_action :authorize_companies, only: [:index]
before_action :build_company, only: [:new]
# ...
private
def authorize_company
#company = authorize(Company.find(params[:id]))
end
def authorize_companies
#companies = policy_scope(Company)
end
def build_companies
#company = authorize(Company.new)
end
end
Yeah you could write a single callback method with three code branches but this has lower cyclic complexity and each method does a single job.
Turns out rails controllers have a resource if the model exists and build_resource for actions like new.
class CompaniesController < InheritedResources::Base
before_action :authorize_company, except: :index
private
def authorize_company
authorize resource
rescue ActiveRecord::RecordNotFound
authorize build_resource
end
end

rails 4 before_actions with dynamic parameters

How to set a before_action method with dynamic params, I keep getting an error wrong number of arguments (0 for 1)
class PagesController < ApplicationController
before_action :set_categories
before_action :redirect_if_path_has_changed, only: [:products, :detail]
def home
end
def products
#category = Category.find(params[:id])
#products = #category.products.order("created_at").page(params[:page]).per(6)
redirect_if_path_has_changed(products_by_category_path(#category))
end
def detail
#product = Product.find(params[:id])
redirect_if_path_has_changed(product_details_path(#product))
end
private
def set_categories
#categories = Category.all
end
def redirect_if_path_has_changed(path_requested)
redirect_to path_requested, status: :moved_permanently if request.path != path_requested
end
end
Thank you before
You can do it like this:
before_action only: [:products, :detail] do
redirect_if_path_has_changed("value")
end
Try this. The above works when you need to set any value or something before the action. In you case you want to first find the product or detail from database then you want to redirect to that path. So before_action just calls before the two actions which is not useful in your case.

Devise before_action explanation

I am having trouble understanding this line that gets automatically generated in the controller when I install Devise:
before_action :set_post, only: [:show, :edit, :update, :destroy]
I tried reading the documentation but I am unable to make sense of what it does. For example what does the :set_post symbol do? What is it part of?
Any explanations or resources where I can go for further reading would be appreciated.
Suppose you have a controller like this:
class PostController < ApplicationController
def index
#posts = Post.all
end
def show
#post = Post.find(params[:id])
end
def edit
#post = Post.find(params[:id])
end
end
You see that in show and edit actions there is the same code, you're breaking the DRY principle, so to avoid code repetitions you set an action (method):
def set_post
#post = Post.find(params[:id])
end
that will be performed before the actions that require that same code:
before_action :set_post, only: [:show, :edit, :update, :destroy]
In the end you'll have a controller like this:
class PostController < ApplicationController
def index
#posts = Post.all
end
def show
end
def edit
end
private
def set_post
#post = Post.find(params[:id])
end
end
:set_post - a method at the end of the controller.
The device does not have anything to do with

Permission in rails

I have a jobs pages where users can create new jobs edit and destroy their jobs and I want to let user edit or destroy only their post only if are connected else they will returned to the job show page for this i have this code in my job controller
def require_login
#job = current_user.jobs.find_by_slug(params[:id])
redirect_to job_path if #job.nil?
end
before_action :login_required
def login_required
redirect_to new_user_session_path unless user_signed_in?
end
before_action :login_required, :require_login, only: [:edit, :update, :destroy]
the only part where this don't work is when i not connected and try to edit my job it redirect me to the log in form but after login it redirect me to the home page instead of the edit page
First of all, the code block you pasted looks weird, for three reasons:
Indentation is wrong
You have before_action :login_required twice and it's not even the same
From the methods names it's unclear what you want exactly
From what you wrote, you want a user to edit or destroy a job only if they are logged in - otherwise you want to send them to the jobs index page. If that's right, the code in your controller should look like this:
class JobsController < ApplicationController
before_filter :require_login, :only => [:edit, :update, :destroy]
def edit
# your code here
end
def update
# your code here
end
def destroy
# your code here
end
private
def require_login
redirect_to job_path unless user_signed_in?
end
end

Checking an attribute is true before executing a CRUD action

Before any of my article controller crud actions can run (excluding index), i want to make sure that the article's active field is true.
I thought about doing this in a before_filter, but at that point #article has not been set, any ideas please?
Thanks
You could set the article in a helper method and remove some code duplication while you're at it.
class .. < ApplicationController
helper_method :current_article
def index
# your code etc..
end
private
def current_article
#article ||= Article.find(params[:id], :conditions => { :active => true }) ||
raise(ActiveRecord::RecordNotFound)
end
end
Basically you can now call current_article in your show, edit (etc) actions and views instead of #article.
You just need to do 2 before_filter.
1 with load the article and the second one to check if field exist
before_filter :load_article, :only => [:show, :edit, :update]
before_filter :has_field, :only => [:show, :edit, :update]
...
private
def load_article
#article = Article.find(params[:id])
end
def has_field
unless #article.active
redirect_to root_url
end
end

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