polymorphic-associations

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JPA TABLE_PER_CLASS problems with ManyToOne

I have the following hierarchy @MappedSuperclass @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)[详细]

2023-03-23 05:45 分类：问答
Using controller for association to render different partials depending on the belongs_to object type

My question was if Post has_many Comments, and I just want to update a comment, should I do that in the Post, or Comments controllers. I just watched the Railscasts on Polymorphic Associations and saw[详细]

2023-03-22 04:17 分类：问答
How to update a polymorhic model

I have a polymorhpic model as follows: class Upload < ActiveRecord::Base belongs_to :uploadable, :polymorphic => true[详细]

2023-03-21 19:56 分类：问答
Issue with setting values to a model in rails

I have a model named User . I am using Devise for authentication. The \'User\' has many \'Profiles\' and one default profile . So I have added a column called \'default\' to the User model. I want to[详细]

2023-03-21 17:17 分类：问答
Ruby on Rails: polymorphic many-to-many design?

I\'m having troubles getting a polymorphic many-to-many model working in ruby/rails. The model has three tables that need to be joined, Infection, Drug, and Symptom:[详细]

2023-03-21 06:09 分类：问答
Nested attribute not saving in a form with polymorphic associations

I\'m trying to make an app where a user can save goals, milestones for those goals, tasks for the milestones, and tasks for the goal itself. I\'m using polymorphic associations, but making a form to i[详细]

2023-03-19 19:23 分类：问答
nested form with polymorphic models

I\'m making an app with the following attributes, and I\'m working on a creating a single form to be able to save a goal, a goal\'s tasks, a goal\'s milestones, and a milestone\'s tasks.[详细]

2023-03-19 15:39 分类：问答
How can I elegantly construct a form for a model that has a polymorphic association?

Here are my models: class Lesson < ActiveRecord::Base belongs_to :topic, :polymorphic => true validates_presence_of :topic_type, :topic_id[详细]

2023-03-19 05:15 分类：问答
DB model for many tables with a zero-to-many relationship to the same table

I\'m creating a DB schema for PostgreSQL 9.0 DB that will represent many real-world entities, with a table per entity. Most of these entities can have 0 or more free-text notes associated with them. A[详细]

2023-03-18 12:39 分类：问答
Rails 3: Accessing parent object from inside a polymorphic rails model?

I have a polymorphic association - \"address\" (belongs to \"addressable\"). Amongst others, it s开发者_JS百科erves the \"shop\" model.[详细]

2023-03-18 12:03 分类：问答