search for: autoincrements

Hello, I am attempting to learn Ruby on Rails. I''m using Instant Rails 2.0 on a Windows computer. I really want the id number to autoincrement, but I am not sure how to do that. The script that''s generated after the scaffold is listed below. Any help is appreciated. class CreateMenuitems < ActiveRecord::Migration def self.up create_table :menuitems do |t|

Hi I need to push newly created item id to file. (ie. its autoincrement value) I tried this on controller but it wont work, it cant find id value for the newly created item. def create @imitem = Imitem.new(params[:imitem]) system "echo \"@imitem.id\" > /tmp/myid" any help ? --~--~---------~--~----~------------~-------~--~----~ You received this message because you

Apologies if this has been discussed before, but with the search function down its hard to find out if it has The first Agile book recommended using the automatically assigned row id of an object as a foreign key reference, as rails would automatically interpret the attribute (for example) product_id as the table ''product'' and row ''id''. I''ve just

I am attempting to redirect to the show method after creating a new object. So, for example, once a new post is created the user is presented with the new post in a show view. The problem is I can''t get the correct <at> post.id to send to the show method. Rails always returns 0 for this value. Here''s what I have so far: class ContentController < ApplicationController

Hey everyone, I''m working on an application that has a table with a nice natural primary key. Outside of the rails world it would be *the* primary key. I would prefer to use this natural primary key and define associations that use it. I''ve done so but the problem is that my form for entering a record in this table is currently failing. I''ve used

There is a table: execute (<<-SQL) CREATE TABLE "tasks" ( "id" serial primary key, "number" serial, "version" integer DEFAULT 0 NOT NULL, "latest_version" boolean DEFAULT ''t'' NOT NULL, "hidden" boolean DEFAULT ''f'' NOT NULL, "type" character varying (1) NOT

I''ve written a story and I run into a snag. I''ve written the create_forum method and told it to set the id to 1 but when it creates the forum the id is autoincremented. My forums table is empty but the id keeps incrementing the newest record on creation. When I run the story it comes out as something like 59 which fails my story because I''m asking it to look at /forums/1

I have two tables like: Table A: id (autoincrement) name Table B id id_of_A desc I want to add a record to table A and based on the id of A, I want to add a record to table B. I don''t think there is any SQL command that support this (at least in MySQL 4.1, so I use LAST_INSERT_ID()). (Is there any other way? or MySQL 5 support any special SQL command?) But I need

I use this naming convention for primary keys: ActiveRecord::Base.primary_key_prefix_type = :table_name_with_underscore I generate the MySQL test database: rake db:test:prepare, and although the column is there there is no primary key enforcement/index and no autoincrement (so activerecord saves fail). Is this a bug? What is the best workaround? Alan

Hi, I''ve used .save to save the attributes, but on my table there is an autoincrementing id (not the primary key) that doesn''t need to be inserted... but save try to INSERT it anyway... is there a way to avoid save from acting this way or to whisper him to be more polite this time? ;) Thanks, Enrico -- "The only thing necessary for the triumph of evil is for good men to do

Hi, the display of LSS16 files from a DISPLAY file (as documented in http://www.syslinux.org/wiki/index.php/SYSLINUX#Display_graphic_from_filename:) seems heavily broken since syslinux has been converted from assembler to C. I already discovered one bug in core/include/graphics.h (and core/graphics.c): the pointer VGAFilePtr is of type uint16_t*, but should be plain char*. This bug causes the

Hello, I created a table in MySQL with this command CREATE TABLE example (pk INT NOT NULL AUTO_INCREMENT,PRIMARY KEY(pk), id VARCHAR(30),col1 VARCHAR(30),col2 VARCHAR(30)) ### In R, I can connect to this table: library(DBI) library(RODBC) chan <- odbcConnect("MySQL51", uid="root", pwd="xxx") first <- sqlQuery(chan, "select * from example")

I am creating an app that will out grow an int(10) unsigned for the id field, ie. 4,294,967,295 records. What are my options, I have looked at the GUID plugin that lets you use a 32 char GUID, but I still want the id''s to be sequential, and (I think) that the overhead of searching a varchar field will be too big for such a large number of records. It does not appear you can use a

Hi. I''m having a problem with my testing. The following table in my development database (MySQL 4.1.12, InnoDB): +-----------------------+------------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------------------+------------------------+------+-----+---------+----------------+ |

...a very slow machine. Let''s further say that my app has an action that leads to a very simple insert into the "impressions" table of the db, a la "INSERT INTO impressions(docid) VALUES($docid);" - and let''s say the db automatically adds created_at as now() and autoincrements primary key. Will RoR/AR block on this insert? If so is there a way to make it non-blocking (asynchronous)? Alternatively, let''s say I wanted to log such impressions on a remote log server using UDP and syslog - any guidance on doing that? (Not all logging mind you, but just this speci...

I put this config in environment.rb # Use table_id instead of id for primary key. config.active_record.primary_key_prefix_type = :table_name_with_underscore I have this migration: class CreateEntities < ActiveRecord::Migration def self.up create_table :entities do |t| t.string :entity_name, :null => false, :limit => 40 t.string

Hi, I would like to figure out how to determine what the id of the last element in a table is. Is there an equivalent to the Table.find() method which will tell me the number of elements in a table? also, maybe more importantly, where are the available methods on tables documented? What i am trying to do is to increment the id and work through a table and check whether the id i am currently

Ok, I have an table column that needs to auto-increment, but isn''t the primary key (although I guess it could be). The format for the column is "SR001234" and it needs to autoincrement like so: SR001234 SR001235 SR001236 ... SR999999 How can I do this? I know Ruby has some pretty nice constructs for doing things like this, but I just don''t quite see how to put them

Hello, When I run the command: "ruby script/generate scaffold Product Admin" I receive the following error after the usual changed files info: "Couldn''t find ''product'' generator" The command is based on "Agile Web Application Development with Rails" first edition on page: 57. Just to give some context to what I am doing, I just created

Hi, I have a many-to-many relationship between two tables, questions and answers. My MySQL schema for the link table creates a primary key from the two fields to prevent duplicate records. When I add the same answer to the same question more than once, rails attempts to create a duplicate record and explodes with a MySQL error: MysqlError: Duplicate entry ''3-3'' for key 1: