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Rails has_many with dynamic conditions

Rails 4+ way (Thanks to Thomas who answered this below): has_many :faixas_aliquotas, -> (object) { where(“regra_fiscal = ?”, object.regra_fiscal) }, :class_name => ‘Fiscal::FaixaAliquota’ Rails 3.1+ way: has_many :faixas_aliquotas, :class_name => ‘Fiscal::FaixaAliquota’, :conditions => proc { “regra_fiscal = #{self.regra_fiscal}” } Rails 3 and below: has_many :faixas_aliquotas, :class_name => ‘Fiscal::FaixaAliquota’, :conditions => [‘regra_fiscal = #{self.regra_fiscal}’] No. This … Read more

ASP.NET MVC Model vs ViewModel

Essentially Model and View Model are both simple classes with attributes. The main objective of these classes are to describe (to “Model”) an object for their respective audiences that are respectively the controller and the view. So you are completely right when you say To my understanding, it’s a kind of Model that has a … Read more

Rails :dependent => :destroy VS :dependent => :delete_all

The difference is with the callback. The :delete_all is made directly in your application and deletes by SQL : DELETE * FROM users where compagny_id = XXXX With the :destroy, there is an instantiation of all of your children. So, if you can’t destroy it or if each has their own :dependent, its callbacks can … Read more

Ignore mapping one property with Automapper

From Jimmy Bogard: CreateMap<Foo, Bar>().ForMember(x => x.Blarg, opt => opt.Ignore()); It’s in one of the comments at his blog. UPDATE(from Jamie’s comment Jan 4 ’19 at 11:11:) Ignore has been replaced with DoNotValidate in ForSourceMember: https://github.com/AutoMapper/AutoMapper/blob/master/docs/8.0-Upgrade-Guide.md

Cannot overwrite model once compiled Mongoose

Another reason you might get this error is if you use the same model in different files but your require path has a different case. For example, in my situation I had require(‘./models/User’) in one file, and then in another file where I needed access to the User model, I had require(‘./models/user’). I guess the … Read more

All Levels of a Factor in a Model Matrix in R

(Trying to redeem myself…) In response to Jared’s comment on @Fabians answer about automating it, note that all you need to supply is a named list of contrast matrices. contrasts() takes a vector/factor and produces the contrasts matrix from it. For this then we can use lapply() to run contrasts() on each factor in our … Read more

Is there a way to get a collection of all the Models in your Rails app?

The whole answer for Rails 3, 4 and 5 is: If cache_classes is off (by default it’s off in development, but on in production): Rails.application.eager_load! Then: ActiveRecord::Base.descendants This makes sure all models in your application, regardless of where they are, are loaded, and any gems you are using which provide models are also loaded. This … Read more

Accessing MVC’s model property from Javascript

You could take your entire server-side model and turn it into a Javascript object by doing the following: var model = @Html.Raw(Json.Encode(Model)); In your case if you just want the FloorPlanSettings object, simply pass the Encode method that property: var floorplanSettings = @Html.Raw(Json.Encode(Model.FloorPlanSettings));

How I can put composite keys in models in Laravel 5?

I wrote this simple PHP trait to adapt Eloquent to handle composite keys: <?php namespace App\Model\Traits; // *** Adjust this to match your model namespace! *** use Illuminate\Database\Eloquent\Builder; trait HasCompositePrimaryKey { /** * Get the value indicating whether the IDs are incrementing. * * @return bool */ public function getIncrementing() { return false; } /** … Read more

Get Android Phone Model programmatically , How to get Device name and model programmatically in android?

I use the following code to get the full device name. It gets model and manufacturer strings and concatenates them unless model string already contains manufacturer name (on some phones it does): public String getDeviceName() { String manufacturer = Build.MANUFACTURER; String model = Build.MODEL; if (model.toLowerCase().startsWith(manufacturer.toLowerCase())) { return capitalize(model); } else { return capitalize(manufacturer) + … Read more