rails-postgresql

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How do I lock records in Rails 3 for a specific amount of time?

What I want to do is basically have a user obtain the lock on a record and have it for a specific amount of time so they can make changes to it, like wikipedia. So lets say a wikipedia article gives t[详细]

2023-04-13 04:00 分类：问答
How to add sequences to a migration and use them in a model?

I want to have a \"Customer\" Model with a normal primary key and another column to store a custom \"Customer Number\". In addition, I want the db to handle default Customer Numbers. I think, defining[详细]

2023-04-09 06:14 分类：问答
Heroku - Rails 3 to 3.1 migration issues with PostgreSQL: relation "users" does not exist

I have been following documents on how to move from Rails 3 to 3.1 and make it work on Heroku.I used the manual upgrade technique given here: http://webtempest.com/upgrade-rails-3-to-3-1/[详细]

2023-04-08 19:02 分类：问答
Converting from MySQL to Postgres and getting a 'column "Product" does not exist' error

I\'m using acts_as_taggable_on in rails and I\'m trying to get a listing of all Products that have yet开发者_JS百科 to be tagged.In MySQL the following query worked:[详细]

2023-04-04 05:25 分类：问答
Postgres' Composite Type on Rails 3

I\'ve discovered a new thing about Postgres: Composite types. I really like this approach and 开发者_如何学Goit will be very useful for me.[详细]

2023-04-04 00:42 分类：问答
Trouble setting up Postgres

So long story short I\'m starting work on a project and I have a variety of things that I need to setup in order to get started. One of those being PostgreSQL. I\'m trying to get it setup but I\'m run[详细]

2023-04-03 02:29 分类：问答
Eager loading and group by in PostgreSQL

I know PostgreSQL, unlike MySQL, requires to list all selected fields in the group by clause when using aggregate functions, e.g.[详细]

2023-04-01 00:40 分类：问答
has_many & belongs_to migration with foreign keys and database constraints in postgres?

I\'ve searched several questions about migrations and their answers, but I didn\'t find a satisfactory solution.[详细]

2023-03-31 01:00 分类：问答
How to migrate a boolean field in MySQL to PostgreSQL in Heroku?

I have a application, running with MySQL in my local machine. There is a field I define as boolean in Rails,开发者_C百科 which is represent in 0 or 1 in MySQL.[详细]

2023-03-29 22:20 分类：问答
rails postgresql database connection

I am trying to use a postgresql database for my rails app. I followed the tutorials provided in this link:[详细]

2023-03-29 05:20 分类：问答