associations

I have created a complex object in rails with a principle parent object "Resume" it has a number of child objects for each section("objective_section", "contact_section", etc), is there a way I can fetch all associated objects to the parent object Resume? If by fetch you mean load from the database all in one query, then sure: Resume.first(:include => [:objective_sections, :contact_sections]) # etc... If this is a common pattern and you want to DRY things up without much effort, you can throw this into a named_scope in your model: class Resume < ActiveRecord::Base has_many :objective_sections

Can you have a belongs_to belongs_to relationship in Rails? Search results gave me two results. The fact that I can't find very much info on the subject, seems to indicate that it shouldn't be done or is bad practice. I asked yesterday about a has_many relationship, but thought because I couldn't find information on this, I would generate a question so it is easier for people to search for this in the future. I'm paraphrasing another users answer (I hope this is ok). A Shoe can have many Socks, but only one active Sock. Other Socks are inactive. All Socks are also unique with unique patterns.

Hi I am trying to associate my User model with login model and Question_details models.But if i am using the Question_details association then i am geeting eagerLodingError :user is not associated to login but if i am commenting it then it works fine so how can i associate it ? But if i am associating with User Model module.exports = (sequelize, DataTypes) => { var Users = sequelize.define('users', { name: { type: DataTypes.STRING(100) } phone: { type: DataTypes.BIGINT, unique: true } }, { freezeTableName: true }); Users.associate = function(models) { Users.hasOne(models.login, { foreignKey:

I have two models, Video and Frame. Frame.belongsTo(models.Video); Video.hasMany(models.Frame, { as: "Frames" }); I now need a way to specify first and last frame for a video, but can't get it to work. I tried this: Video.hasOne(Frame, { as: "FirstFrame" }); Video.hasOne(Frame, { as: "LastFrame" }); but that creates FirstFrameId and LastFrameId in the Frames table instead of the Videos table. I need to have video.get/setFirstFrame() and video.get/setLastFrame() functions available. How can I do this? Ellebkey You don't need to set belongTo and hasMany as you show at first. Use only one

I am wondering how can you paginate the results obtained from an entity association mapping in Doctrine 2? For example class Customer { /** * @OneToMany(targetEntity="Order") */ private $orders; } can be used as such: $customer->getOrders(); which will return a collection of Order objects. The problem is when there are a large number of order objects. We can use Doctrine\ORM\Tools\Pagination\Paginator when building custom queries, however I do not see any way to hook into query generation when utilising association mapping. class Paginator { /** * @param Query|QueryBuilder $query A Doctrine

I am relatively new to Rails and am working on a project that involves multiple, "nested" levels of data. I am having issues making the proper associations so I can get all the child elements of a model 3 levels higher. Here is an example of the models: class Country < ActiveRecord::Base has_many :states end class State < ActiveRecord::Base belongs_to :country has_many :cities end class City < ActiveRecord::Base belongs_to :state has_many :people end class Person < ActiveRecord::Base belongs_to :city end I have implemented a relationship in the Country model, has_many :cities, :through =>