similar to: Arel: misunderstanding with intersections

I just posted this ticket in Lighthouse, but thought perhaps some discussion here would help point me in the right direction toward a solution. Here is a description of the problem (from the ticket - https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/6693-arel-union-does-not-support-order-or-limit) : > If we take two `ActiveRecord::Relations` and join them via `union`:

Firstly I''m sorry if this is off-topic but I think it''s a question that won''t be answered without good core knowledge. I have written a multiple self join query something like this: Person.find :all, :select => ''children_people_3.*'', :joins => { :children => { :children => :children } }, :conditions => { :people => { :name

I trying to create a select using Arel but I''m passing three parameters, I want to include the parameters only if they are different to nil or blank. Here is my method: def self.advsearch(summary_description, specialties, place) User.joins(:experience,:summary,:information) .where(Information.arel_table[:business].eq(false))

Here''s a join table for an educational institution: create_table "student_appointments", :force => true do |t| t.column "supervisor_id", :integer, :default => 0, :null => false t.column "student_id", :integer, :default => 0, :null => false t.column "course_id", :integer, :default => 0, :null => false [other columns

Hello RoR Groupies, I''m seeing some weird ActiveRecord-2.2.2 SQL generation when doing eager association/preloading and using joins and ordering by said join table. Here''s an example: class Photo < ActiveRecord::Base end class User < ActiveRecord::Base has_one :headshot, :class_name => "Photo" end class Mail < ActiveRecord::Base belongs_to :user end

Hello all, I''ve recently been on a project where somewhere needs using case insensitive search(using UPPER(name) LIKE '''') and LIKE condition, I want to use arel and don''t use the old style string concatenation, can arel handle this? But I check on arel documentation, doesn''t seems have any upper/like operator, and check on arel source, under

I''m trying to figure out how to use ActiveRecord in conjunction with ARel. In particular, I''d like to replace my residual literal SQL with ARel, if only I could see how. Let''s take Article with multiple Versions as an example. With ARel alone, I can find articles with their latest versions like this articles = Article.arel_table versions = Article.arel_table

Hi, I''ve search for documentations on queries with Arel 2 but there is pretty nothing and all I''ve found is for Arel 1 so I''ve run into NoMethodError: undefined method `[]'' for #<Arel::SelectManager:0x00000003f1b820> errors with join syntax. My query is barely simple but involve nesting queries. I have 4 tables. Assets, Deposits, Orders and OrderLines

Hello, Arel::SelectManager (arel 2.0.9) uses following statement to insert a new record: @engine.connection.insert im.to_sql, ''AREL'', primary_key_name, primary_key_value But in DatabaseStatements insert ist defined as: insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) Actually, Arel::SelectManager does not use the sequence name. This leads to issues

Hi, I was very surprised by difference of delete_all on association vs model(delegated to relation). Given TaskFilter.has_many(:qualifiers, :class_name=>''TaskFilterQualifier'') TaskFilter.delete_all => one DELETE statement Without :dependent option on "qualifiers" association TaskFilter.first.qualifiers.delete_all => SELECT `task_filter_qualifiers`.* FROM

Hello rubyonrails-core, I’ve been looking into possible changes to ActiveRecord / Arel to make it easier to write Rails applications that are free of SQL injection vulnerabilities, and in particular do so in a way that makes it easy for a code reviewer to verify that the app is safe from such bugs. The concern: ----------------- With the ActiveRecord API as is, it’s relatively easy to write

Hi, I have a self-referential has_many :through relationship setup to track relationships between users. Basically relationships are modeled as a join table with an extra column ''relation''. create table relationships ( user_id integer unsigned not null, friend_id integer unsigned not null, relation char(1) not null, ) --- relations --- f = friend r = request to

I have more or less the same problem. I''m trying to build a system where users can enter their friends. But the solutions seems not to work for me. I used same sql: CREATE TABLE `friends` ( `user_id` int(11) NOT NULL default ''0'', `friend_id` int(11) NOT NULL default ''0'', KEY `user_id` (`user_id`), KEY `friend_id` (`friend_id`),

I have the following code: advertisements_arel = Advertisement.order("advertisements.id DESC").arel @advertisements = (params[:website_id].present? ? advertisements_arel.where(:website_id => params[:website_id]) : advertisements_arel).to_a It returns a struct Arel::SelectManager::Row data But I''d like it to return an array of Advertisement objects (like it would

I have a real-world application with some complex queries that I want to convert to Arel (as part of an upgrade to Rails 3.1). So that I can understand what I''m doing before I flail around in my real app, I wrote a little sample app (just the models) with some similar associations -- one table joined with itself and more tables that join to another table, so there are some queries that

I want to write an arel engine to run an arel-based client against a RESTful back-end. I''ve seen people talk about it, but haven''t seen it actually done. Is it possible? What is the best place to find info/examples on how to do it? tx, Andy -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this

My question is whether there''s a more idiomatic rails way of structuring this query or of redoing the underlying models. First, the ugly find_by_sql code, which is the method to generate an atom feed: def atom items_per_feed = 15 sql_query = "SELECT activities.*, users.real_name AS real_name, accounts.last_scraped_at AS last_scraped_at,

Trying to model a bunch of users that have friends that are other users. clearly a job for has_and_belongs_to_many, but the trick is, they have ratings for their friends. I have gone through the Rails Recipes book, and it seems like I''m trying to combine the self-referential many-to-many recipe (12) and the many to many relationships where the relationship itself has data recipe (16). So

Hi, Basically I have two models: User and Godfather. The godfather table has three columns: - user_id (FK --> User) - user_godfather_id (FK --> User) - description (text) Inside each model class, I am adding the following associations: class User < ActiveRecord::Base has_many :godfathers # for user_id has_many :godfathers, :foreign_key =>

trying to set up a "has_and_belongs_to_many" relationship would very much appreciate the help, not sure what im doing wrong at all. Scheme.rb class Scheme < ActiveRecord::Base validates :schemename, :presence => true belongs_to :user has_many :levels, :dependent => :destroy has_and_belongs_to_many :works end Work.rb class Work < ActiveRecord::Base