similar to: "Complex" Eager Loads

Hi, I just uploaded a Rails plugin that allows you to specify custom SQL when doing a find with associations (AKA eager loading). One of the problems I encountered when implementing the Chacha Underground (http://underground.chacha.com) was being able to use queries provided by the DBA to efficiently get all the informaion I needed to render a page. In some cases, I needed to go two or three

is there a way to always eagerly load an associated object so that you don''t have to put :include into every finder? class Product <ActiveRecord::Base belongs_to :user #always load user when product is loaded end Product.find(1).user.login #1 query since user was loaded with the product, same as if i used :include but I don''t want to have to specify it everywhere.

Polymorphic associations work great until I try to do some eager loading through :include. In my example, the interface name is ":imagehaver". Here''s my little eagerly loading find line: Image.find(params[:id], :include => :imagehaver) All it gives me is an ActiveRecord::EagerLoadPolymorphicError with no further explanation. I haven''t been able to dig up anything

Hi, Why are limited eager loads and conditions on the eager tables incompatible? Doing a find(:all) without :include causes a select * query to be generated, which means the id fields everwrite each other if associated tables are included using :joins. But using :include, if conditions are placed on the tables listed in :joins then Rails throws an exception when :limit is included too.

[I hope the repost isnt'' "minded". Following the advice of another thread I''ve changed the subject to a question. If I haven''t included important info, please ask. My database is being unduly killed. Jodi] Cheers on-the-Rails-ers, Before I start, I''ve read the ActiveRecord docs on eager loading, but for the life of me, I can''t seem to get

My problem is that I have two classes where the eager loading isn''t working as well as I would hope... Here are my two classes: class Daynote < ActiveRecord::Base belongs_to :userplace class Userplace < ActiveRecord::Base has_many :daynote, :dependent => true When I show my userplaces, I want to get the associated daynotes with them, so I am doing: @userplace =

Hello. Using the ":include", which generates a "LEFT OUTER JOIN" SQL command, it is possible to eagerly preload second order data objects (children) for a given association. I wanted to know, if it is possible to eagerly preload and cache third order (or more) data objects, which are little-children or little-little-children. As I''ve seen. it is possible to add

Hey all, I''d really appreciate some eyes on https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/5845-activerecord-3-eager-loading-fail#ticket-5845-19. There''s a small issue in Rails 3 eager loading, and this ticket has an accompanying patch. Sssociations that show up twice in a Relation chain like: Article.includes(:comments).includes(:comments =>

Hello all, Is it possible to do eager loading of association extensions? That is, the following code produces one SQL query: cat = ProductCategory.find(:first, :include => :pricing_rules) cat.pricing_rules But if in ProductCategory I have an association extension like this: has_many :pricing_rules do def applicable() find(:all).select(&:applicable?) end end the

i have an eager load query as such: @groups = ReviewQuestionGroup.find(:all, :conditions => ["review_category_id = ?", @review.category.id], :order => ''review_question_groups.position, review_questions.position'', :include => :questions) in dev mode, this works fine... i get results like @groups[0].questions.length = 13. in production, i

Hello everyone, I would like to eager load scoped records to avoid queries executed in a loop (huge performance impact). The "scoped" part is what is giving me a hard time. I''m using Rails3 RC. Does anyone have any idea how I can do it? Here is a test case : we have an "Article" and a "Comment" Activerecord models, article has many comments comment

I''m attempting to wrestle an old DB into Rails. This relationship is giving me trouble: class Show < AR::Base has_many :segments end class Segment < AR::Base belongs_to :show has_one :media #this has no PK/FK relation end A Segment is "linked" to Media by Media.name, which is the result of concatenating Segment.name and Segment.part. As I said there are is no

Hi, While debugging a network server I'm developing I noticed something unusual - call to unserialize() resulted in an error about loading a namespace. I was a bit taken back by this - why should unserializing an object cause a namespace lookup? Are there any other side-effects of unserialize() that I should be cautious about? I've been digging through the R_Unserialize() call, I

Hi Trying to cut down on queries with eager loading and noticed the following in development.log Load IDs For Limited Eager Loading - SELECT id ....etc Followed by Load Including Associations - SELECT table.id ... etc Is this common practice? What is limted eager loading? Cheers Mark -- Posted via http://www.ruby-forum.com/.

So I have a model that acts_as_tree and I run a method on a collection of all of these records. This method walks the tree and fetches the parent/children, etc. This results in many, many duplicate SQL queries to be executed. Is there a way to eagerly load all of these models? Something along the lines of: Model.find(:all, :include => [:children, :parent]) If I execute the above statement, I

I''m looking for someone to confirm the following as a bug in Rails 1.0 before I post it to Trac. If I use eager loading on an association that has conditions defined, the conditions are ignored. The following example illustrates the problem. I have two tables: create_table "blogs", :force => true do |t| t.column "name", :string end create_table

Hi, currently the eager association loading via ":include" does not work when a has-many or habtm association is combined with offset/limit (which is required for paginations). This is because in these cases, the result set will contain more than one row per object, but limit/offset works on row numbers. I''ve developed a patch that makes this work by using 2 SQL statements

Activerecord''s find option `:select'' does not appear to work when :include is used to eager load associations. However, I sometimes want to perform ready-made joins on associations to limit the results of a query. here''s a simple example: table university: STRING code INT id table term: STRING name INT university_id INT id the associations of the models

There is a dedicated section about eager loading in the docs. A coworker discovered eager loading does not work in polymorphic associations the hard way :-) so I''ve written a patch that documents it: http://dev.rubyonrails.org/ticket/10610 There are at least a couple of tickets that implement something that would change that though: http://dev.rubyonrails.org/ticket/9640

A model has 2 columns in its table asset_type_id asset_id the asset_type_id links directly to the table asset_types via a belongs_to asset_types contains a single column ''name'' method_missing in the model says when you call a method matching /^asset.*/ call the corresponding method substituting ''asset'' for the contents of asset_type.name (ie. the name in