Technology Errors

Upgrade Redmine Rake Migrate Error: uninitialized constant ActionController::AbstractRequest

I ran into an issue earlier where adding a sub project to an already existing Redmine project produced an error and after a little bit of troubleshooting determined that upgrading Redmine would resolve the issue. During the upgrade process I ran into some other issues including a specific migration error using rake that is noted below. The upgrade process involved upgrading Redmine 0.8.3 to Redmine 0.9.3.

Technology Insights

Create Ruby Migration To Add An Index To A PostgreSQL Table

The other day I did some optimization work on a PostgreSQL database and at the end needed to create migrations so the changes I was going to make could be deployed on multiple servers. It was my first shot at migrations so I wanted to note for myself and anyone else that may find it useful how to create Ruby migrations for dropping and adding Indexes on PostgreSQL tables. Below you will find the basic concept for creating a migration that adds a Postgres table index and information on removing a table index which is just the reverse of adding.

Technology Insights

What Exactly Does the Scaffold_Resource Generator give you?

The regular scaffold generator (e.g. ruby script/generate scaffold model controller) requires you to create your model and controller first. The scaffold_resource generator, on the other hand, generates the (RESTful) model and controller for you. For example: ruby script/generate scaffold_resource Caregiver first_name:string last_name:string In Rails 2.0, use resource instead: ruby script/generate resource Caregiver first_name:string last_name:string Here’s…

Technology Errors

“Multiple Default Values” Migration Error with PostgreSQL 8.2.5

PostgreSQL 8.2.5 error

== CreateHeartrates: migrating ================================================

— create_table(:heartrates)

NOTICE: CREATE TABLE will create implicit sequence “heartrates_id_seq” for serial column “”

rake aborted!

PGError: ERROR: multiple default values specified for column “id” of table “heartrates”

: CREATE TABLE heartrates (“id” serial primary key DEFAULT NULL, “user_id” integer DEFAULT NULL, “timestamp” timestamp with time zone DEFAULT NULL, “heartrate” smallint NOT NULL)


Technology Insights

Making (and Verifying) the Migration to PostgreSQL in Rails

Install After installing PostgreSQL on Windows, I converted my Rails application from MySQL to PostgreSQL with the following steps: Create a new database in PostgreSQL Installed postgres-pr gem (Ruby driver) because the postgres gem (native driver) didn’t work. Will figure out why later on. Changed the appropriate Rails config stuff in database.yml development: adapter: postgresql…