similar to: Add Column After Column in Migrations

I''m a beginning programming using ActiveRecord outside of Rails to do conditional processing of database records. So far, I''ve been successful. However, my script loads all matching records into memory first. There are hundreds of thousands of matching records so the script quickly consumes over 500MB of RAM before any processing is done. Is there a way to avoid this preloading

Hi, My data frame looks like A B C a b a x y z I want to add a new column which says "y" if either A or B matches with C and "n" if there is no match. How can I do that? Thanks [[alternative HTML version deleted]]

I have a an STI table which acts_as_tree, that has a large number of classes/types. My common fields are: id parent_id name description with 4 more text fields, I could cover most of my classes if I could redefine the name of the field like this. text1 AS address1 text2 AS address2 text3 AS zipcode For one class and text 1 AS model_number text2 AS vendor Is there a construct that will allow

All, I have a form with the following field interaction rules. Given checkbox A, text field B text field C If checkbox A is checked then make text field C equal to the value of text field B and disable field C. If checkbox A is unchecked then enable field C. In order to display a form where I''m manipulating an already existing object, I have something like this in my RHTML template

Hi, When we update a record via an update form, is there an easy way to find out the fields that have been changed. If the update is successful, i want to display: The following fields have been changed: field-name = new-value ... Thanks, Lantis. -- Posted via http://www.ruby-forum.com/.

In place of padding in zfs znode i added a new field. stored an integer value and am able to see saved information. but after reboot it is not there. If i was able to access before reboot so it must be in memory. I think i need to save it to disk. how does one force zfs znode to disk. right now i dont do anything special for it. Just made an ioctl, accessed znode and made changes. example in

Hello, I have a data frame with many rows, and I want to create a column with a name only at every 12th row, starting from 97 to 278. Thanks in advance!

Hello everyone, just wondering if anyone can help me with a migrations question here. Using: rails 2.0.2 ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin] mysql 5.0.45 Platform: windows xp The problem: ---------- I created a migration that is designed to add a column named "deleted_at" (timestamp) and then remove a column named "is_deleted" (boolean). The idea is to

Hi This may be a dumb question with an obvious answer. It would seem that an input form field identified with an ''id'' qualifier and not with a ''name'' qualifier is not recognised by Mechanize - at least it isn''t in the form field list. Is there any way of getting at these elements or am I, as I suspect, fresh out of luck. But you never know ...

My question is about where certain kinds of logic sit in the Model and Controller objects or more specifically the relationship between Model and Controllers. Does an Model class contain a Controller class, the otherway round, or are they two seperate classes that talk? 1. Should the Models be treated as the primary objects within a program and the matching controller is simply a way of

Hi! I need to conditionally update a dataframe field based on values in other fields and can't find even how to search for this right. Sorry if this has been asked before. But, specifically, I have a 490 X 221 dataframe and need to count, by row, how many fields in Dataframe$field_a...Dataframe$field_zz are non-null and enter this value in Dataset$ABCtaskNum. I have field name

URLS: - http://raa.ruby-lang.org/project/arrayfields/ - http://www.codeforpeople.com/lib/ruby/arrayfields/ - http://rubyforge.org/projects/arrayfields/ SYNOPSIS: allow keyword access to arrays: require ''arrayfields'' fields = ''name'', ''age'' row = [ ''bob'', 30 ] row.fields = fields row[

Hi Team, Trying to upgrade samba 4.9.3 on debian wheezy. while building facing the following error. Build phase! ` Configuring Samba 4 - x86_64 Checking for program gcc or cc : /usr/bin/gcc Checking for program cpp : not found Checking for program ar : /usr/bin/ar Checking for program ranlib : /usr/bin/ranlib Checking for gcc