A Ruby Relational Algebra Library
Active Relation also known as "Arel" is the Relational Algebra library used in Active Record and Ruby on Rails.
Questions tagged [active-relation]
69 questions
0
votes
1 answer
Display records found by ActiveRelation in HTML
I want to display the records returned by following line in html,
@var = User.where("first_name like ?", "%"+params[:searchTextField]+"%")
How do i display these in html?
user2603796
0
votes
2 answers
Have query working but want ActiveRelation instead
A project has legacy_users and group_users. group_users has to go through groups to get the users. I'd like to build a project.users that combines these queries as an arel.
Here is Project:
class Project < ActiveRecord::Base
has_many …
Dave Bryand
- 601
- 6
- 11
0
votes
1 answer
How to get a collection from a collection in Rails?
I have collection of users with posts, and I'd like to get all the posts from all of the users. Is there a way to do something like this:
User.active.posts.unique.visible
Active and visible are both special scopes that I've written myself.
Dylan Karr
- 3,304
- 4
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- 29
0
votes
2 answers
Relationships in Ruby on Rails across 4 models
I am trying to make some advanced relationships in my RoR models.
S far what I have working is projects and tasks- Projects have tasks and users have projects.
I now want that a user who is 'signed up' to a project can now 'sign up' to tasks within…
user1900791
- 59
- 5
0
votes
1 answer
Active Record and Active Relation
What is the difference between active record and active relation in Ruby on rails? Please put the light in very basic terms as i am new to the Ruby on rails and learning it on own.
Ahmad hamza
- 1,816
- 1
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- 46
0
votes
1 answer
Refining Thinking Sphinx search float field with Active Relation
I have database of products and I use Thinking Sphinx to search through them. I have a pretty complex set of conditions to find the right product in the correct category and details. However, I'd like to refine the search so that I can make…
paniwani
- 659
- 3
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0
votes
1 answer
Rails ActiveRelation Sub Relation
Im new to rails and have a question about accessing relations of relations in ActiveRecord.
Consider this psuedo code:
class Organisation
has_many: :projects
class Project
has_many: :tests
class Test
belongs_to: project
Effectively 3 levels. I…
Cheyne
- 1,964
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- 43
-1
votes
2 answers
rails scope model without relation
I have such model
class Ads::Posting < ActiveRecord:Base
has_one :child, class_name: 'Ads::Posting', foreign_key: :posting_id
belongs_to :parent, class_name: 'Ads::Posting', foreign_key: :posting_id
end
I need to write scope which gets all…
jizak
- 382
- 2
- 13
-2
votes
1 answer
Do or do not use Ruby on Rails Associations
I am new in RoR , and I wanted to design a web based system. I want to know , if we don't use association in RoR , do happen any problem in system?
Please help me and explain me what problem could be happen in such a system.
thanks
ainternet73
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