similar to: preloading children of child rows

Hi, I have a scenario where a doctor can have one or more specialties. For each doctor, one and only one of her specialties can be designated as primary. So I have tables called doctors, specialties, and doctors_specialties, the last of which has a boolean is_primary column. The doctor model class specifies that: has_and_belongs_to_many :specialties I want to enforce, at the lowest possible

hiho. following problem. i have 3 tables in my database with each representing an object. lets say A belongs_to B belongs_to C. when i do my_a = A.find(:all) i can access B as my_a.b and C as my_a.b.c thats fine but rails querys the database each time i do that so is use my_a = A.find(:all, :include => :b) works fine for my_a.b but not for my_a.b.c so i tried my_a = A.find(:all, :include

Dear R users, I am trying to convert a dataset from one format to several rectangular datasets. A consultant helped design the data entry program for our survey using Delphi/Pascal and for each household the information is stored in a file called "EA-HM-HH.TXT" where EA is the enumeration area number, HM is the homestead number and HH is the household number. Within this file the

I currently have 3 tables/models: 1) Clients, 2) Charges, and 3) Court_Dates. Clients 1..n Charges 1..n Court_Dates I am trying to find all clients that have a court_date on a certain day: something along the lines of (@client.charge.court_date.date == Date.today). I have had success preloading child rows using the :include parameter, but that only works with a parent and a child, or a

On Wed, Jul 17, 2019 at 13:33:08 -0500, Probir Roy wrote: > Hi, > > I am trying to preload two shared libraries while running Qemu using > libvirt. To preload the shared libraries I have added an environment > variable in the $domain.xml file with the following command: > > ``` > virt-xml generic --edit --confirm --qemu-commandline >

Hi, I''m fairly new to rails and I need some advice on best practice. I''m working on an application that has a calendar section (I know, not another one of those!) and I was wondering, when is it best to query your database and when is it best to preload a model. In the calendar app the user will have a month view of entries and was wondering should I preload all the entries of

Dear All: I have a clinical study where I would like to compare the demographic information for 2 samples in a study. The demographics include both categorical and continuous variables. I would like to be able to say whether the demographics are significantly different or not. The majority of papers that I have read use multiple techniques to achieve this (e.g., t-test for the continuous

I am using :include => :assocation to preload data that I know will be used later in the UI over and over. However I have data like that that is an association of one of the associations. How would i preload that data too? e.g. grant has_many :people and person belongs_to :group I can''t include the :group association in a Grant.find because its not an association of grant,

Hi, I wasn't sure where to write this so thought I'd just put it in the forum. The WineHQ.org website is great, just I think pre-loading the hover images for the main menu section would make the site even better as it would no longer mean the hover images would need to be loaded when the mouse is hovered over them. I found a solution here:

I could experiment to figure this out, but maybe the work has been done so I''m going to ask. Using Ajax, if I wanted to preload several (20) small (<1K) images, behind the scenes... would I... 1 - Queue the loading of the images with Ajax one at a time, asynchronously, and ignore the completion results. Would this result in the image being in the browser''s cache even if

Hi, I am trying to preload two shared libraries while running Qemu using libvirt. To preload the shared libraries I have added an environment variable in the $domain.xml file with the following command: ``` virt-xml generic --edit --confirm --qemu-commandline

Hi all, I''m building an application which uses mostly ajax to update the sections of the page. Now I''ve come to some thoughts on how to make the ajax-handling more efficient / less buggy. Currently, when the page loads up, I start some "new Ajax.Updater"-stuff to fill some sections with content from the db. I also registered watchers which also start nearly the same

I have this code in a view: <% for topic in @topics %> <%= topic.id %> <%= topic.dr_title %><br/> <ul> <% for doc in topic.child_documents %> <%= doc.dr_title %><br/> <% doc = nil %> <% end %> </ul> <% end %> Though the topic titles and IDs display correctly,

Dear all, I have a data.frame that includes a series of demographic variables for a set of respondents plus a dependent variable (Theta). For example: Age Education Marital Familysize Income Housing Theta 1: 50 Associate degree Divorced 4 70K+ Owned with mortgage 9.147777 2: 65

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

Hi everybody, I'm making a POC with samba4 RODC I had problem with preload command. Setup was a fresh 4.1.6 ADS install and a 4.1.6 RODC. All is working fine except account preload : root at smbrodc:~# samba-tool rodc preload m.brant --server=smbdc.gnutopya.local -U administrator Password for [GNUTOPYA\administrator]: Replicating DN CN=Mike BRANT,OU=Users,OU=Rouen,DC=gnutopya,DC=local

Hi, I've stumbled upon this message: https://lists.samba.org/archive/samba-technical/2013-November/096322.html Which includes a patch to make user preloading in a RODC actually work. I'm running SerNet Samba packages, version 4.1.11, and this patch has not been applied. Is it blocked for some reason? Thanks in advance, -- Roberto Su?rez Soto Allenta Consulting

Hi, I''m trying to use counter caching in a tree structure (in this case Bob Silva''s threaded list). This is the definition: class Folder < ActiveRecord::Base acts_as_threaded has_many :files end I would like each parent to have the total count of all the childrens member. So when inserting a new file I update the file_count following the parent_id through all the

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

Briefly, I want to create an :insert_sql attribute for a has_and_belongs_to_many relationship, and then add items to that relationship using push_with_attributes. Is that possible? Less briefly: I have a legacy postgresql database where one of the join tables has an ID column, so I had to set up the association with a custom :finder_sql attribute, as follows: class Topic <