sti | 易学教程

Declaring static properties of Rails model subclasses

阅读更多关于 Declaring static properties of Rails model subclasses

问题 I'm new to Ruby and Rails (and programming!), and trying to figure out the idiomatic way of passing properties from a model to its STI children. I have a generic model 'Document', and some models that inherit from it — let's take 'Tutorial' as the example. I have a string field for an 'icon', in which I want to store the icon's filename but not full path (I think the path should be up to each model, as it's a detail of retrieving the record's data?): class Document < ActiveRecord::Base attr

Why does rails not respect the type of a belongs_to associated object with STI, when its superclass is abstract?

阅读更多关于 Why does rails not respect the type of a belongs_to associated object with STI, when its superclass is abstract?

问题 I've come across this rather odd bit of behaviour in a rails application I'm working on. I have multiple types of Post in an inheritance heirarchy, and a Post has_many FeedEntries. class Post < ActiveRecord::Base has_many :feed_entries end class Post::BlogPost < Post; end class Post::Discussion < Post; end class Post::Article < Post; end class FeedEntry < ActiveRecord::Base belongs_to :post end Now, when I have everything set up as before, calling FeedEntry#post on a saved object always

Rails app using STI — easiest way to pull these records?

阅读更多关于 Rails app using STI — easiest way to pull these records?

问题 I'm learning my way around Rails and am working on a sample app to keep track of beer recipes. I have a model called Recipe which holds the recipe name and efficiency. I have a model called Ingredient which is using STI - this is subclassed into Malt, Hop, and Yeast. Finally, to link the recipes and ingredients, I am using a join table called rec_items which holds the recipe_id, ingredient_id, and info particular to that recipe/ingredient combo, such as amount and boil time. Everything seems

Rails STI and the setting of the “type” string

阅读更多关于 Rails STI and the setting of the “type” string

问题 I think I need to use STI in Rails. Here's my class: class Person < ActiveRecord::Base end class Landlord < Person end and the people table has a :type column that's a string. So, what I expect is to see in the table, is that every row that is a Person has the type set to "Person" and every Landlord has the type set to "Landlord". However, that's not what I see. Each Landlord has the type set to "Landlord", but all the Person have their type set to nil. This very well could be the way that

Rails app using STI — easiest way to pull these records?

阅读更多关于 Rails app using STI — easiest way to pull these records?

I'm learning my way around Rails and am working on a sample app to keep track of beer recipes. I have a model called Recipe which holds the recipe name and efficiency. I have a model called Ingredient which is using STI - this is subclassed into Malt, Hop, and Yeast. Finally, to link the recipes and ingredients, I am using a join table called rec_items which holds the recipe_id, ingredient_id, and info particular to that recipe/ingredient combo, such as amount and boil time. Everything seems to be working well - I can find all my malts by using Malt.all, and all ingredients by using Ingredient

Can I use ActiveRecord relationships with fields from an Hstore?

阅读更多关于 Can I use ActiveRecord relationships with fields from an Hstore?

Can I tie a model to another through active record belongs_to using a field from an hstore hash? I'll elaborate: I have a User model that gets subclassed via STI on one of its fields to many different other User models based on permissions: class User < ActiveRecord::Base self.inheritance_column = :role #other definitions and validations end Here's one such submodel, the nightclub_boss model, meant for administrative users for my app: class NightclubBoss < User belongs_to :nightclub #the boss record has a nightclub_id has_one :rp_boss #rp_boss should have a nightclub_boss_id has_one :captain

Rails 4 Devise Multiple User Models STI

阅读更多关于 Rails 4 Devise Multiple User Models STI

问题 Thanks for reading. I am using Devise and Rails 4. I want to add multiple User Models(admin, usertype1, usertype2) such that they inherit from the main User Model. I have searched many posts and come to the conclusion that I may use CanCan, which I do not want, or I may use Single Table Inheritance. The way I see it is to add a type string-column to my main User model I created with Devise. I will also need to extend each sub-class from the parent as in: class Admin < User end class Usertype1

Rails 3 using MongoDB via mongoid adapter - is there any way to share attribute specifications without using Single-Table Inheritance?

阅读更多关于 Rails 3 using MongoDB via mongoid adapter - is there any way to share attribute specifications without using Single-Table Inheritance?

Probably a confusing title, but not sure how else to put it. Example should make it clearer. I have many different models that share many of the same attributes. So in each model I have to specify those same attributes and THEN the attributes that are specific to that particular model. Is there any way I can create some class that lists these basic attributes and then inherit from that class without using Single-Table Inheritance? Because if I put all the shared attributes and Mongoid includes into a single model and inherit from that base model in the other models, then STI is enforced and

Rails STI and the setting of the “type” string

阅读更多关于 Rails STI and the setting of the “type” string

I think I need to use STI in Rails. Here's my class: class Person < ActiveRecord::Base end class Landlord < Person end and the people table has a :type column that's a string. So, what I expect is to see in the table, is that every row that is a Person has the type set to "Person" and every Landlord has the type set to "Landlord". However, that's not what I see. Each Landlord has the type set to "Landlord", but all the Person have their type set to nil. This very well could be the way that rails works, but I was just looking for some confirmation. This is, indeed, how STI works. The base class

Rails Question: belongs_to with STI — how do i do this correctly?

阅读更多关于 Rails Question: belongs_to with STI — how do i do this correctly?

I've been playing around with STI and belongs_to / has_many relationships and I'm a bit confused. I have a few questions based on a model configuration similar to: class Parental < ActiveRecord::Base end class Mother < Parental has_many :babies end class Father < Parental has_many :babies end class Baby < ActiveRecord::Base belongs_to :?????? end What should Baby belong_to? In terms of a migration, what should i name/add for foreign key on the babies table? I've had a hard time researching this, is there a definitive source that explains this? The API docs did not seem to hit it on the head OR