All Questions
1,114
questions
213
votes
4
answers
113k
views
Rails :dependent => :destroy VS :dependent => :delete_all
In rails guides it's described like this:
Objects will be in addition destroyed if they’re associated with :dependent => :destroy, and deleted if they’re associated with :dependent => :...
- 4,732
129
votes
6
answers
144k
views
Removing a model in rails (reverse of "rails g model Title...")
rails g model Rating user_id:integer message:string value:integer
How can I completely remove this model? Thanks
- 1,291
126
votes
8
answers
117k
views
Using helpers in model: how do I include helper dependencies?
I'm writing a model that handles user input from a text area. Following the advice from http://blog.caboo.se/articles/2008/8/25/sanitize-your-users-html-input, I'm cleaning up the input in the model ...
- 1,303
110
votes
9
answers
111k
views
Rails: Validating min and max length of a string but allowing it to be blank
I have a field that I would like to validate. I want the field to be able to be left blank, but if a user is entering data I want it to be in a certain format. Currently I am using the below ...
- 6,433
95
votes
10
answers
94k
views
Rails: Update model attribute without invoking callbacks
I have a User model that has a :credits attribute. I want a simple button that will add 5 to the user's credits, through a route called "add" so that /users/3/add would add 5 to the credits of user ...
- 24.9k
84
votes
5
answers
58k
views
How to access URL helper from rails module
I have a module with a function. It resides in /lib/contact.rb:
module Contact
class << self
def run(current_user)
...
end
end
end
I want to access the URL helpers like '...
- 2,282
68
votes
3
answers
26k
views
How to know whether a model is new or not?
class Post < ActiveRecord::Base
end
post = Post.new
How do I judge whether the 'post' is a new model which is not pulled from the database?
- 3,503
58
votes
3
answers
78k
views
Ruby on Rails: errors.add_to_base vs. errors.add
I have read that errors.add_to_base should be used for errors associated with the object and not a specific attribute. I am having trouble conceptualizing what this means. Could someone provide an ...
- 18.9k
51
votes
8
answers
25k
views
Rails Model has_many with multiple foreign_keys
Relatively new to rails and trying to model a very simple family "tree" with a single Person model that has a name, gender, father_id and mother_id (2 parents). Below is basically what I want to do, ...
- 1,285
42
votes
5
answers
19k
views
guidelines for where to put classes in Rails apps that don't fit anywhere
I'm wondering if there are any best practices about where to put non-standard Ruby files in Rails apps, those that don't fit in any of the default directories (controllers/models etc.).
I'm talking ...
- 7,677
41
votes
7
answers
48k
views
Rails Model without a table
I want to create a select list for lets say colors, but dont want to create a table for the colors. I have seen it anywhere, but can't find it on google.
My question is: How can I put the colors in ...
- 821
36
votes
4
answers
28k
views
Rails: Serializing objects in a database?
I'm looking for some general guidance on serializing objects in a database.
What are serialized objects?
What are some best-practice scenarios for serializing objects in a DB?
What attributes do you ...
- 17.2k
31
votes
2
answers
14k
views
Rails put validation in a module mixin?
Some validations are repetitive in my models:
validates :name, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
validates :name_seo, :length => { :minimum => 2 },...
- 4,401
30
votes
3
answers
5k
views
problem with passing booleans to update_attributes
I've got the following Model:
class GuestCatering < ActiveRecord::Base
# Validation
validates :name, :presence => true
validates :order_number, :presence => true
validates :...
- 2,704
24
votes
3
answers
20k
views
Rails: Modifying a Model Generated by Scaffolding
How do you modify a model you've generated using modeling? For example, the model myModel originally had columns a, b and c, but I now want to add column d.
- 1,702
23
votes
4
answers
7k
views
Rails - Where (directories) to put Models that are not Active Record
We are building out apps that have Models that are not database components.
We are curious to learn what others are doing in the rails community to address this subject.
We are struggling with where ...
- 94.7k
20
votes
5
answers
39k
views
Ruby on Rails - Access controller variable from model
I am trying to access an instance variable which is set in the controller in the model. The controller is the products controller and the model is the products model. The instance variable is a ...
- 20.3k
20
votes
4
answers
16k
views
How to override a column in Rails model?
I have a model for one of my database tables. I want to override the column name for that particular table. How would I achieve it.
For example, let my table be called DUMMY and it has one column ...
- 35.3k
17
votes
2
answers
19k
views
Roll back all rails migrations or drop tables and modify migrations (start from scratch)
I'm new to Rails and have started a project that I'm unhappy with my models and db schema.
I'd like to start again from scratch but keep all my views, controllers.
What's the best way to go about ...
- 6,475
17
votes
3
answers
6k
views
Namespaced models in Rails: What's the state of the union?
Since the beginning, Rails has had issues with namespaced models. As time went on, pretty much everybody gave up on using it. Myself included.
With Rails 2.3 out, I'd like an update on the situation. ...
- 78.5k
16
votes
4
answers
16k
views
Rails form validation conditional bypass
I have a rails model that validates uniqueness of 2 form values. If these 2 values aren't unique the validation errors are shows and the "submit" button is changed to "resubmit". I want to allow a ...
- 3,822
15
votes
6
answers
11k
views
What is purpose of around_create callback in Rails Model?
when is around_create callback code executed, in what situations we should use it?
- 6,707
15
votes
2
answers
29k
views
Helper methods for models in Rails
Is there a proper place for helper methods for models in Rails? There are helper methods for controllers and views, but I'm not sure where the best place to put model helper methods. Aside from adding ...
- 51.9k
14
votes
2
answers
2k
views
Are there any example Rails apps where business logic is kept in separate classes than ActiveRecord?
There's been a recent surge in the Ruby community of blog posts, tweets, and comments on the benefits of using better OO design, and specifically separating business logic from persistence logic. ...
- 8,330
12
votes
4
answers
8k
views
Ruby on Rails model inside namespace can't be found in controller
I'm new to rails and can't figure out this issue...
I have a controller
Admin::Blog::EntriesController
defined in app/controllers/admin/blog/entries_controller.rb
And I have a model called
Blog::...
user19302
12
votes
2
answers
5k
views
How to protect a Rails model attribute?
My Invoice model has an address_id attribute, and I don't want this address_id to change FOREVER. So I don't want this to happen outside the class:
invoice.address_id = 1
invoice.address = ...
- 385
12
votes
3
answers
14k
views
Ruby on Rails: Properly creating a model instance that has relation to multiple models
Let's say I have a standalone User model and Service model.
I also have a Order model that holds the orders created by an user for a service. I'm wondering how I could properly create an order entry ...
- 3,355
12
votes
1
answer
5k
views
Ruby on Rails ActiveRecord: pluralization
I'm new to Rails, so forgive my ignorance of ActiveRecord. One of my models is named "campus". I ran the migration and it pluralized everything except "campus".
I thought that was lame so I added ...
- 6,757
12
votes
2
answers
1k
views
has_one, :through => model VS simple method?
I have some issues using has_one, through => model. The best is to show you my case.
class Category
has_many :articles
end
class Article
has_many :comments
belongs_to :category
end
class ...
- 5,127
11
votes
4
answers
6k
views
How do you model "Likes" in rails?
I have 3 models: User, Object, Likes
Currently, I have the model: a user has many Objects. How do I go about modeling:
1) A user can like many objects
2) an Object can have many likes (from ...
- 6,405
10
votes
5
answers
5k
views
Rails: Skinny Controller vs. Fat Model, or should I make my Controller Anorexic?
I know similar questions have been answered before - such as:
Where should logic go
where to do certain tasks, etc.
But I have a more specific question - How far should I take this axiom: keep ...
- 6,958
10
votes
1
answer
6k
views
rails how to properly move models to a namespace
I'm running rails v 3.2 .
After some time developing application I need to move some models into namespace ex: /app/models/address.rb to /app/models/local/address.rb
I tried simply moving models to ...
- 4,835
9
votes
2
answers
28k
views
How do you pass data from a controller to a model with Ruby on Rails?
How do you pass data from a controller to a model?
In my application_controller I grab the user's location (state and city) and include a before_filter to make it accesible in all my controllers via
...
- 5,259
9
votes
2
answers
6k
views
booleans in rails with sqlite
I am a bit of a noob still with rails, but I am running across something that seems a bit odd. I added a boolean field to a model in the database thusly
t.column :admin, :bool, :default => false, :...
- 41.7k
9
votes
3
answers
9k
views
call before methods in model on ruby
This my implementation to developing way to run code before all method in your model
The call "before_hook :months_used" method need to be on bottom of class to the ExecutionHooks can get the ...
- 893
9
votes
3
answers
3k
views
Is subclassing a User model really bad to do in Rails?
I am getting lots of push back from Rails because I have subclassed User into many different subclasses. In my application, not all users are equal. There's actually a lot of model objects and not ...
- 5,961
8
votes
4
answers
11k
views
Why aren't Rails model attributes accessible using symbols instead of strings?
I need to compare some Rails (2.3.11) model attribute values before and after a database update, so I start by finding my record and saving the existing attribute values in a hash, as follows:
id = ...
- 1
8
votes
2
answers
10k
views
How can I use a named scope in my model against an array of items?
I know that I can do a query for recent books based on an array as in
scope :recent_books, lambda {|since_dt| {:conditions=>{:created_at >= since_dt}}}
but how can I do a similar query when I ...
- 94.7k
8
votes
1
answer
15k
views
can't write unknown attribute `scrapbook_entry_id'
Attempting to add data to a join table of scrapbook_entries which has_one :scrapbook and has_one :recipe.
:recipe and :scrapbook already exist. I am trying to add them to link them with the ...
- 1,871
8
votes
3
answers
7k
views
How can default values in Sequel Models be set?
Given the code below, how can default values be defined for the Model.
(let's say the default for :name should be 'Thing').
require 'pp'
require 'sequel'
DB = Sequel.sqlite
DB.create_table :items ...
s_2k
8
votes
2
answers
3k
views
What is the "rails way" to access a parent object's attributes?
Let's say I have a model Doctor, and a model Patient. A Patient belongs_to a Doctor.
A Doctor has an attribute office.
I would want to, given a Patient p, be able to say p.office and access the ...
- 6,159
8
votes
3
answers
10k
views
Rails: accessing field value from model method
Just started learning Rails (3). I am tearing my hair out trying to find how to do something presumably utterly trivial: access the value of a model instance's field, from inside a method on that ...
- 35.8k
7
votes
4
answers
15k
views
Rails Model: Name -- First, Last
I'm fairly new to rails, working on a Rails 3 app with a Profile model for users.
In the profile Model I'd like to have a "name" entry, and I'd like to be able to access logical variations of it ...
- 42.8k
7
votes
2
answers
11k
views
Use a Rails helper in a model [duplicate]
Possible Duplicate:
Access a view helper for a model in rails
I know this is probably not something I should do often, but I want to use a helper within a model.
I'm generating a spreadsheet ...
- 7,076
7
votes
5
answers
8k
views
Rails 3 - how to skip validation rule?
I have for the registration form this validation rule:
validates :email,
:presence => {:message => 'cannot be blank.'},
:allow_blank => true,
:format => {
:with =&...
- 47.4k
7
votes
4
answers
26k
views
Rails 3 find all associated records has_many :through
I would like to list all posts that are connected with some specific category and classroom.
I have:
class Post < ActiveRecord::Base
has_many :category_posts
has_many :categories, :through =&...
- 4,732
7
votes
2
answers
5k
views
Ruby NoMethodError - undefined method `blah_url' for BlahController
I am calling this js from a link:
function createNewTopLevelEntry(){
var user_id = $("#user").val();
var header = prompt("Enter the name");
$.ajax( '/users/' + user_id + '/entries', {
data: {
...
- 183
7
votes
2
answers
8k
views
Testing validations in model using RSpec with Rails
I'm super new to testing my app using RSpec and I'm trying to test the validation of a comment without a user and keep getting syntax errors.
Here is the comment model code.
class Comment < ...
- 111
7
votes
3
answers
3k
views
Where do I put my database query tests in rails?
I am coming from a Spring/hibernate background. I have noticed that Rails has no dao and service layers. This really speeds up development, but I don't know where to put my tests sometimes.
Right now,...
- 22.4k
6
votes
6
answers
16k
views
Reverse order of display of blog entries and comments, Ruby on Rails
I am new to rails so could use some help here. I have followed several tutorials to create a blog with comments and even some of the AJAX bells and whistles and I am stuck on something that I hope is ...
- 6,433