I'm trying to get my head around the concept of named_scoped queries in rails.
I'm trying to filter a table to get only non featured items (:featured => false).
In my model i have added
scope :allgames, where(:featured => false)
and
scope :featured, where(featured => true)
I'm trying to list all featured and non featured items separately on my Game index page.
Is it possible to to it via a named scope.
So far i have:
<% #games.each do |item| %>
<% if item.featured %>
<%= render 'application/item_synopsis_builder', item: item %>
<% end -%>
<% end %>
And I wonder if it is possible to do something like:
<% #games.featured.each do |item| %>
<%= render 'application/item_synopsis_builder', item: item %>
<% end %>
or
<%= render partial: 'application/item_synopsis_builder', collection: #games.featured %>
When I try I get a message saying that there is no method featured.
But when I run the command Game.featured in the console I get the result list of all featured games.
Is it possible to access this list/method in the view?
Named scopes are added to the model as a class method, so trying to access the method on a collection of objects won't work. Similar functionality can be achieved with:
#games.where(:featured => true).each do
...
end
But I would recommend having two variables in your controller:
#featured_games = Games.featured
#all_games = Games.allgames
then use those in your views.
Your views are driven by the #games instance variable that is created by the controller that is rendering the views. Named scopes create a class method for subclasses of ActiveRecord::Base. So "Game.featured" returns something because defining the named scope created a method for the Game class. It did not create an instance method that objects of the Game class (such as #games) can invoke. That's why "#games.featured" gives you an error.
To do what you want to do, create two instance variable in the controller and pass them to the view, e.g.
#all_games = Game.allgames
#featured_games = Game.featured
Both variables will be available to your view, and you can construct loops to render each collection however you like.
A scope is a class method (or assimilable to, I don't know the specifics), so yes, Game.featured would work, but when you do #games.featured, you are calling featured on an array of Game instances.
Related
I've got a search form that returns our products. However, if a user inputs a string that contains certain words (in this instance, 'color'), it returns far too many products. I'm trying to remove the string 'color' from the query that is searched on the backend, but maintain the original query's string as #unfiltered_query so I can reference the #unfiltered_query on the front-end template.
if query.include? "color"
#unfiltered_query = query
end
query.slice! "color"
values = query.split
binding.pry
It was not working, so I ran pry to see what was going on. In the form, I searched "Red paint color". When I call #unfiltered_query in pry, it outputs "Red paint", even though I create the method before .slice! is called?!
What am I missing?
Thank you!
p.s. the HTML template that I'm using to reference the instance is:
<div class="search-input"><h2>
<% if #unfiltered_query.present? %>
<%= #unfiltered_query.titleize %>
<% else %>
<%= query.titlelize %>
<% end %>
</h2></div>
Can you try like this :
if query.include? "color"
#unfiltered_query = query.dup
end
query.slice! "color"
values = query.split
binding.pry
This could be due to passing by reference.
I'm a real beginner with MongoDB and MongoID.
I created two scaffolds
class Objet
include Mongoid::Document
field :nom, type: String
embeds_one :coordonnee
end
And
class Coordonnee
include Mongoid::Document
field :adresse1, type: String
field :adresse2, type: String
field :code_postal, type: String
field :ville, type: String
embedded_in :objet
end
That's what I get when creating a new Objet :
Now, I'm trying to show only the field adresse1 for this document, but it doesn't work. I can display only the whole embedded document doing this :
When I do :
<%= #objet.coordonnees.adresse1 %>
I get this error :
undefined method `adresse1' for #<Hash:0x2b2b1f0>
How can I do that ?
EDIT
Doing that, I can display all the elements "Adresse1, adresse2, ville, code_postal" :
Controller
def show
#objet = Objet.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #objet }
end
end
View
<%= #objet.nom %>
<% #objet.coordonnee.each do |t| %>
<%= t[1] %>
<% end %>
But my question is : How to display ONLY one of them ? Such as ville, or code_postal or adresse1... ?
What was your code that works for the full document? It was dropped from your post.
In the mongo Shell, you could do this with dot notation db.collection.find({},{'coordonnees.adresse1':1,'_id':0}) You need to specify the '_id':0 because _id is always returned by default.
The other answer will not work because adresse1 is a subdocument. You must include the reference to coordonnees.
Not hugely familiar with MongoID, but assuming you can make calls straight to mongo, there is a second implicit parameter to all find-like statements called a projection that specifies what exactly you would like to return.
For instance, showing only adresse1 for all items in your collection:
db.collection.find({},{"coordonnees.adresse1": 1, "_id":0})
should return only the adresse1 parameter. I wasn't quite able to tell exactly what context you're displaying the objects in, but regardless of context, api calls to mongo should be fairly straightforward to make. Let me know if I've misinterpreted this question though.
In your posted example, you should change your find function to something like the following:
Objet.find({params[:id]}, {:fields => [coordonnees.adresse1]})
Hope that helps.
I found the solution to my problem.
To display only one element of the hash, I can do :
<%= #objet.coordonnees['adresse1'] %>
I am not sure if you are using embeds_one or embeds_many as you are using singular and plural forms of the relation name interchangeably in your question.
If it is a embeds_one the problem is that you should not iterate on #objet.coordonnee as it is a single document. Your view code should look like:
<%= #objet.nom %>
<%= #objet.coordonnee.address1 %>
If it is a embeds_many, your relation name should be plural, then you should be able to use t.address1 in your view.
# model Objet
embeds_many :coordonnees
# view
<%= #objet.nom %>
<% #objet.coordonnees.each do |t| %>
<%= t.address1 %>
<% end %>
I don't want to use the default
<%= f.submit %>
and have created a helper function for it, which also embeds an icon. The helper function expects a label to put on the newly created button.
I'm calling it like this:
<%= submit_button("icon-plus", I18n.translate("helpers.submit.create")) %>
But now on this text appears on the button:
%{model} toevoegen
Instead of:
Product type toevoegen
If I use the normal submit button then the correct text appears so my yml files are correct. How can I get the correct text to use in the helper?
Helper code:
def submit_button(icon, label)
link_to "javascript:void(0)", :class => 'btn btn-primary', :onclick => "$(this).closest('form').submit()" do
raw('<div class="') + icon + raw(' icon-white"> ') + label +raw('</div>')
end
end
As the I18n guide says, the translate function interpolates variables passed in the %{} brackets using its second argument (a hash).
In your case you need to tell it the model by doing this:
I18n.t("helpers.submit.create", model: "Product type")
If you want a generic option that would work for any model, you can see how Rails itself does it by looking at the source on GitHub - it's something like
I18n.t("helpers.submit.create", model: f.object.class.model_name.human)
As an aside, you don't need to (and probably shouldn't) use raw there. What you are trying to achieve could easily be done with the built-in helpers:
link_to ... do
content_tag :div, label, class: "#{icon} icon-white"
end
My problem is as follows:
I've got a form view, which needs to display success and failure icons after submit.
Before submit it just needs to show the form without the success and failure icons.
We can do this in several ways when this is the form:
<%= form_for #resource do |f| %>
<div class='<%= set_class #resource, :name %>'>
Name: <%= f.text_field :name %>
</div>
<% end %>
Check if the request is a POST:
def set_class( record, attribute )
if request.post?
if record.errors[attribute].any?
return "FAILED"
else
return "SUCCESS"
end
end
# If not submitted, we don't want a class
end
Set a flag after validation ( We can replace request.post? in above solution with record.tried_to_validate ):
class MyModel < ActiveRecord::Base
after_validation :set_tried_to_validate
attr_accessor :validated
def set_validated
#tried_to_validate = true
end
end
But I don't really like these solutions..
Isn't there an inside Rails method to check if the validation process is done?
You can first test for validity..
#form.valid?
Which will generate errors stored in 'errors' on your #form. To see if errors exist on a specific field,
#form.errors[:some_field]
On your form, you can simply do:
<% if #form.errors[:some_field].empty? %>
Valid
<% end %>
As long as some fields generate errors, the whole form will be !valid?, so you'll revert to showing the form again (:new), and you can should 'Valid' or checkmark.
I think you are looking for something like client side validations, if want the validation to show inline on the form. http://railscasts.com/episodes/263-client-side-validations
EDIT
If you want to capture the 3 stages, you can save in your db. New, Validate, Finished and just use callbacks to save each stage and set the default to new. (You will have the change the data type of the validated attribute to string)
after_validation update attribute to "validate"
after_save update attribute to "Finished"
Then you can use an if elsif else conditions to check for the value of that attribute and render the tick and cross. Obviously, this isn't pretty and you should just use valid? and the errors? helpers.
I'm using newes Rails 3 version with will_paginate.
#videos = user.youtube_videos.sort.paginate :page => page
I also added the ##per_page attribute to my youtube_video-model.
But it just won't paginate it. I get always all items in the collection listed.
What have I done wrong?
Yours, Joern.
Why are you calling sort here? That seems unnecessary, and probably would result in it finding all videos and calling pagination on that rather than paying any attention to any variable defined in your Video model. Instead, move the sorting logic into the Video model by using a scope or use the order method.
Here's my solution, my own answer, for all other's having trouble with will_paginate and reading this issue:
Create an ApplicationController method like this:
def paginate_collection(collection, page, per_page)
page_results = WillPaginate::Collection.create(page, per_page, collection.length) do |pager|
pager.replace(collection)
end
collection = collection[(page - 1) * per_page, per_page]
yield collection, page_results
end
Then in your Controller, where you got the collection that should be paginated:
page = setup_page(params[:page]) # see below
#messages = Message.inbox(account)
paginate_collection(#messages, page, Message.per_page) do |collection, page_results|
#messages = collection
#page_results = page_results
end
And in your View:
<% #messages.each do |message| %>
<%# iterate and show message titles or whatever %>
<% end %>
<%= will_paginate #page_results %>
To get the page variable defined, check this:
def setup_page(page)
if !page.nil?
page.to_i
else
1
end
end
So page = setup_page(params[:page]) does the trick, with that simple method.
This WORKS!