activerecord

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Which is the best way to test if a model instance is "empty" in Ruby on Rails?

I want to implement a method that checks if a model\'s instance has only nil or empty attributes, except from its id or timestamps.[详细]

2023-04-12 15:49 分类：问答
RoR: accessing page generated in after_save callback

I\'m having a problem understanding the after_save rails callback. There is a snippet from my model:[详细]

2023-04-12 09:57 分类：问答
Rails 3 syntax with attr_accessible and creating associated objects

Given following model: rails g model Menu name:string rails g model MenuHeader mh_name:string menu_id:integer[详细]

2023-04-12 09:52 分类：问答
using .each in my page says undefined method

I am trying to get a list of the events with name \"Party\". I also have a list of all of the events, which works fine. So I put this in my pages_controller:[详细]

2023-04-12 08:12 分类：问答
Do ActiveRecord's statements cover the entire scope of what is possible in raw sql?

In other words, can any complex sql statement (non-db specific SQL code) be broken up into constituent ActiveRecord statements? For the sake of the 开发者_运维技巧argument, I am not considering perfor[详细]

2023-04-12 06:02 分类：问答
Optional or Conditional model associations in Rails

I have a user model. Users can have 1 of 3 roles: role1, role2, role3. This is represented by a \'role\' column in the user model.[详细]

2023-04-12 03:41 分类：问答
ActiveRecord::StatementInvalid: Mysql::Error: Incorrect string value: '\xE2\x98\xBA.\x0D\x0A...'

I use rails 2.3.11 and on my prod machine I got this exception. In my dev machine It worked fine, Bascially Iam submitting a textarea with huge content and the column \'message\' in my db is of type t[详细]

2023-04-12 01:54 分类：问答
How do I make a button that resorts data on a page?

I have a page that lists all the events in my database of events. I want to create a button that says \"my events\" that when pressed reloads the page but then only displays events that belong to the[详细]

2023-04-12 00:51 分类：问答
Implementing ActiveRecord-like associations for an API wrapper

I recently wrote ParseResource, which is a Ruby API wrapper for Parse.com\'s REST api. Here\'s a some basic usage:[详细]

2023-04-12 00:50 分类：问答
How do I fetch just the ids via ActiveRecord

class PersonAddress < ActiveRecord::Base end I would like to fetch only the PersonAddress ids (primary keys) using a ActiveRecord query, how should I do that, something similar to PersonAddres开发[详细]

2023-04-11 23:53 分类：问答