All Questions
Tagged with model ruby-on-rails-3
609
questions
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
39
votes
6
answers
9k
views
Rails Models: how would you create a pre-defined set of attributes?
I'm trying to figure out the best way to design a rails model. For purposes of the example, let's say I'm building a database of characters, which may have several different fixed attributes. For ...
- 42.8k
37
votes
4
answers
17k
views
What is the Rails3 version of errors.add_to_base?
I want to write a custom validation in Rails 3, but following this example I get:
'ActiveModel::DeprecatedErrorMethods.add_to_base' call is deprecated in Rails 3.0
What is the rails3 version of:
...
- 18.1k
27
votes
1
answer
7k
views
How to use different authentication_keys for two devise models?
Now I have one devise model, which uses email as authentication_key.
I want to add one new devise model, which uses student_id as authentication_key.
Some guide tells me to modify the configuration
...
- 271
24
votes
4
answers
20k
views
Rails - How to validate a field only if a another field has a certain value?
In my form I have a Select with three values: Apple, Banana and Cherry. If I choose Apple from the select I hide another Select- and a Text-field with some Javascript, because when Apple is chosen, ...
- 658
23
votes
2
answers
11k
views
How to use routing helpers in a model with Rails 3?
In a model callback I make an API call and need to give the API some URLs. Those URLs would be easily generated by a routing helper.
The solution given in this answer
does not work anymore in Rails 3....
- 3,483
20
votes
4
answers
24k
views
Cannot skip validation in Rails 3?
I'm working on a project in Rails 3 where I need to create an empty record, save it to the database without validation (because it's empty), and then allow the users to edit this record in order to ...
- 42.8k
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
7
answers
17k
views
How to create ActiveRecord tableless Model in Rails 3
I am trying to create a Active Record tableless Model. My user.rb looks like this
class User < ActiveRecord::Base
class_inheritable_accessor :columns
def self.columns
@columns ||= [];
...
- 6,054
17
votes
1
answer
21k
views
Rails: How do self-referential has_many models work?
So, I'm working on an app where I want to users to be able to group objects in "folders". Basically:
User has_many :foos
Foos don't have to be in a folder, but they can be. In that case:
Folder ...
- 42.8k
17
votes
6
answers
11k
views
Rails 3 validate uniqueness of one value against a column?
I have a model with an active column, which is a boolean. I want to validate the uniqueness of all newly added records against company_id, such that I can add as many records as I want with the same ...
- 20.2k
15
votes
2
answers
13k
views
How to validate uniqueness in Rails 3 Model if I want to check if there is a 2-field combination?
I want to know if there is a way in Rails 3, in which I can validate the uniqueness of 2 fields that goes in combination.
The logic goes this way:
I have two fields employee_code and date_entry.
...
- 2,329
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
14
votes
2
answers
3k
views
Rails 3 - validating one of two fields has been completed
I'm writing a Rails app to manage a series of banners along the top of our website; each one should link either to a URL provided by the editor, or a specific product selected from a drop-down list.
...
- 491
12
votes
2
answers
10k
views
rails g scaffold for existing model and DB table
I would like to create a structure with
rails g scaffold Article, but I have already created the table Articles and model Articles.
Is there any way to do that?
- 47.4k
12
votes
1
answer
8k
views
How to delete model and scaffolding in RoR?
How can I delete an existing model and scaffolding in ruby on rails 3?
Can I just nuke the folders?
- 984
12
votes
1
answer
9k
views
Rails 3 - how to save (un)checked checkboxes?
I have in a form (form_tag) several checkboxes like this:
<%=check_box_tag 'model_name[column_name]', 1, (@data.model_name.column_name == 1 ? true : false)%>
And updating them like:
variable =...
- 47.4k
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
5
answers
14k
views
get model attribute dynamically in rails 3
How can I get the attribute from the model object dynamically? I have the attribute of the User object as string:
u = User.find(1)
Can I do something like u.get("user_id")
- 8,599
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
10
votes
3
answers
8k
views
Duplicating a record in Rails 3
I have a prescription model in my Rails 3 application. I am trying to work out the best method of allowing records to be duplicated, but allowing the user to "review" the duplicate before it's saved.
...
- 3,784
10
votes
2
answers
4k
views
Merging ActiveAdmin users with existing user model
I've set up ActiveAdmin early in my project and used the default admin_users model for authentication. I've since used Devise to set up a separate User model and have realized it would probably be ...
- 8,144
9
votes
2
answers
4k
views
Load fixtures for specific model
For automated testing, RSpec and FactoryGirl are used.
Frequently, I need to manually play with my application. So, i need a convenient way to populate database with some data.
The most convenient ...
- 17k
9
votes
1
answer
8k
views
find_by_sql with array format in Rails 3
good day guys!
I'm using find_by_sql() in rails 3 to fetch records as follows.
@list=Email.find_by_sql(["SELECT * FROM Emails WHERE sent_id=?",params[:id]])
How to modify the same statement if ...
- 1,610
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
8
votes
5
answers
4k
views
conditional to_param method
I am using the model instance method t_param to generate a SEO-style URL
def to_param
url
end
that way I can generate links to the model with path_to_model(model) and query the model with Model....
- 3,389
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
3
answers
15k
views
Rails - Is there a way to update a single attribute?
I was just wondering, I have a model that, besides the id's from other models (FK), it has a single attribute boolean. I want to know how can I create a button that changes this boolean and just that
...
- 113
7
votes
1
answer
16k
views
Using raw sql queries in Rails 3 application?
I am working on migrating a legacy database into my Rails application (3.2.3). The original database comes with quite a few long sql queries for reports. For now, what I would like to do it use the ...
- 3,784
7
votes
2
answers
622
views
Rails: Uniqueness of two attributes in join table causing 500 error
I have the following models, which basically are trying to mean that a professor has knowledge of many subjects for a particular level. The subjects are fixed, so there will be no new subjects ...
- 23.6k
6
votes
3
answers
14k
views
How to call helper method from model?
I use MongoDB as a database in my Rails application with MongoID gem. I want to call the helper method from the model within after_create callback method. How is it possible?My model code is:
class ...
user1856354
6
votes
3
answers
12k
views
calling a method in model from view
I am trying to evaluate which indicator needs to be displayed next to an item based on if it's been viewed before or not, new comments etc. Until I decide on a symbol to use, I just want a number to ...
- 1,718
6
votes
3
answers
3k
views
Custom model method that should be included in JSON serialization
I'm working with a javascript library where I build comboboxes.
I have the requirement of build a combobox with full name of a person, so I mean name + surname.
Because in database those are 2 ...
- 11.6k
6
votes
4
answers
4k
views
rails: create scaffold for models to inherit from superclass?
I'm new to Rails, still getting my feet wet, so please pardon me if this is either trivial or "the wrong way" to do things.
I'd like to create a superclass for some scaffolded models. For example, I'...
- 7,505
6
votes
5
answers
2k
views
Using a JSON service as a Rails model
How can I use a JSON service as a model for a Rails 3.2 application?
I would like to link model methods to JSON requests, e.g.
MyModel.create to generate a JSON request to create a new record
...
- 6,257
6
votes
1
answer
1k
views
Use one action for multiple models
I have about 5 models that behave very similarly. In fact, I'd like them to share an action for displaying them. For example, for models Car, Truck, Van I want to have a definition like:
[Car, Truck, ...
- 8,144
6
votes
2
answers
3k
views
Generate models from existing tables using Rails 3
Using Rails 3.2.2 and ruby 1.9.3dev and mysql
I am new to ruby and rails. We have an existing database with a couple hundred tables. We would like to try out rails to see if it would be a positive ...
- 3,608
5
votes
1
answer
3k
views
After_save with parameter
This is my model code:
after_create :notify_cards_create
after_destroy :notify_cards_destroy
after_update :notify_cards_update
def notify_cards_update
WebsocketRails[:home].trigger 'cards', {type:...
- 6,205
5
votes
2
answers
5k
views
Self-referencing models in Rails 3
I have an Entity model and I want to display connections between the Entities. ie, Entity 1 is connected to Entity 2.
My thinking, right now, is to create a join model between the two called ...
- 5,867
5
votes
1
answer
4k
views
Rails self-referential has_many through with custom naming of join table
I have some troubles wrapping my head around the following situation..
I am trying to create a tree structure, where I will be able to give custom names to connections between nodes..
So I want to ...
- 6,344
5
votes
2
answers
337
views
Deep model nesting in Ruby on Rails
In quite a big project I encountered a problem of deep model nesting. For example there exists a model like this:
class Communication::Conversation::ForProposal < Communication::Conversation::Base
...
- 2,281
4
votes
2
answers
1k
views
Bound activerecords-queries using aggregate funcs (sum, avg,...) with limit
Given this pseudo-query:
Model.sum(:column, :condition => ['id = ?', id], order => "date DESC", :limit => X)
Here we have the problem that the sum obtained is not "limited" by the value X (...
- 6,158
4
votes
3
answers
3k
views
nested has_many :through in rails 3
I know Rails doesn't support nested has_many :through relationships, though there's been talk and an open ticket about a patch since as early as Rails 2.
I did come across a plugin that's pretty ...
- 5,867
4
votes
2
answers
4k
views
format a date in the rails model
I have a date of birth in the rails model and I display it in different places. Every time I have to specifically format it in mm/dd/yyyy format. Is there something I can do in my model so that ...
- 29.8k
4
votes
4
answers
5k
views
Rails association with tables without models
I'm looking to rewrite my project in Rails. It's currently written in PHP (CodeIgniter), I've come to the point where I'm writing more libraries and core extensions than I'm writing new code. I've ...
- 563
4
votes
2
answers
8k
views
AssociationTypeMismatch (Object expected, got HashWithIndifferentAccess) in Rails app
I'm getting a AssociationTypeMismatch Error and I'm not sure where I'm making a mistake. I'm pretty new to Rails so I'm guessing I'm making some silly mistake. I've checked my syntax and compared it ...
- 305
4
votes
2
answers
2k
views
validation in rails with two date attributes
so i have a model with two date attributes
# migration
t.date :valid_from
t.date :valid_until
these are optional and you should be able to define only valid_from or valid_until, but if both ...
- 25k
4
votes
2
answers
3k
views
Rails not creating intermediary table? - Habtm relationship
The table between the User model and Period model does not exist. They have a has_many_and_belongs_to relationship. I'm learning Rails still, so please bear with me.
This is the contents of the User....
- 1,813
4
votes
1
answer
195
views
Relationships in different namespaces
I'm a little stuck on how relationships are defined between models in different namespaces. I have created this example to illustrate my problem and have added comments with my requirements.
class ...
- 121
4
votes
1
answer
732
views
Adding some custom methods to delayed job in rails 3?
I want to add some custom methods to the delayed jobs model.
I want to have some extra such as...
def status
return "errored" unless self.last_error.blank?
return "waiting" if self.locked_at....
- 5,760