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Questions tagged [named-scope]

339 questions
113
votes
4 answers

What is scope/named_scope in rails?

I've recently started an internship. My employer uses ruby on rails, and I frequently encounter new syntax that I need to look up to understand. I've googled around for a good explanation of named_scope, but what I've found so far is mostly blog…
Ziggy
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59
votes
6 answers

How do you scope ActiveRecord associations in Rails 3?

I have a Rails 3 project. With Rails 3 came Arel and the ability to reuse one scope to build another. I am wondering if there is a way to use scopes when defining a relationship (e.g. a "has_many"). I have records which have permission columns. …
Mario
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45
votes
9 answers

Is it possible to negate a scope in Rails?

I have the following scope for my class called Collection: scope :with_missing_coins, joins(:coins).where("coins.is_missing = ?", true) I can run Collection.with_missing_coins.count and get a result back -- it works great! Currently, if I want to…
Yuval Karmi
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30
votes
1 answer

Rails –Testing named scopes: test scope results or scope configuration?

How should Rails named scopes be tested? Do you test the results returned from a scope, or that your query is configured correctly? If I have a User class with an .admins method like: class User < ActiveRecord::Base def self.admins …
Paul Fioravanti
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28
votes
3 answers

Rails: Is that possible to define named scope in a module?

Say there are 3 models: A, B, and C. Each of these models has the x attribute. Is that possible to define a named scope in a module and include this module in A, B, and C ? I tried to do so and got an error message saying that scope is not…
Misha Moroshko
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20
votes
2 answers

Rails named_scopes with joins

I'm trying to create a named_scope that uses a join, but although the generated SQL looks right, the result are garbage. For example: class Clip < ActiveRecord::Base named_scope :visible, { :joins => "INNER JOIN series ON series.id =…
Gwyn Morfey
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18
votes
1 answer

Mongoid Scope order by syntax please

I'm using the latest mongoid... How do I do the mongoid equivalent of this active record named_scope: class Comment include Mongoid::Document include Mongoid::Timestamps embedded_in :post field :body, :type => String named_scope…
kinet
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18
votes
7 answers

Empty Scope with Ruby on Rails

Following Problem: I need something like an empty scope. Which means that this scope is emtpy, but responds to all methods a scope usually responds to. I'm currently using a little dirty hack. I simply supply "1=0" as conditions. I find this realy…
Baju
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17
votes
5 answers

Can I use an ActiveRecord scope as an instance method?

I have a scope that acts as a filter. For instance: class User scope :in_good_standing, -> { where(:some_val => 'foo', :some_other_val => 'bar' } end Because in_good_standing depends on more than one condition, I'd like to have this defined on an…
JD Huntington
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17
votes
2 answers

undefined method `default_scoped?' while accessing scope

I am getting this error while accessing scopes. Here is AR model class StatisticVariable < ActiveRecord::Base attr_accessible :code, :name has_many :statistic_values scope :logins, where(code: 'logins').first scope :unique_logins,…
Amit Patel
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16
votes
4 answers

will_paginate with named_scopes

I'm using will_paginate for pagination, which has been working well so far, except for this one thing. If I try to paginate a scope, for instance class User < ActiveRecord::Base named_scope :scope, lambda { etc…
Lowgain
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15
votes
2 answers

Does testing Rails 3 Scopes make sense?

I'm a little torn. Do unit tests for Scopes in Rails 3 make sense? On the one hand, I'm writing code and I should test that code. However, on the other hand, basically all my scopes are effectively trivial. Checking one variable against a passed…
Drew
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12
votes
2 answers

Confused using "using" Statement C#

According to MSDN Library using Statement (C# Reference) Defines a scope, outside of which an object or objects will be disposed. But I got this code posted here by some user and I got confused about this: (please see my comment on the code) using…
yonan2236
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12
votes
1 answer

counter_cache in Rails on a scoped association

I have User model which has_many :notifications. Notification has a boolean column seen and a scope called :unseen which returns all notifications where seen is false. class User < ApplicationRecord has_many :notifications has_many…
GMA
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12
votes
2 answers

How to extract common named_scopes from ActiveRecord models

I have named_scope which is reused in multiple ActiveRecord models. For example: named_scope :limit, lambda {|limit| {:limit => limit}} What is the best practice to extract this code to be shared across models. Is it possible to extract it to…
Bartosz Blimke
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