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Here is an explanation with examples:
Consider a Article model, a Event model and a Comment model. A comment belongs to either Article or Event.
As we can notice, there is a significant piece of code common to both Event and Article.
Using concerns we can extract this common code in a separate module Commentable.
Models with many associations and otherwise have tendency to accumulate more and more code and become unmanageable.
Concerns provide a way to skin-nize fat modules making them more modularized and easy to understand.
The above model can be refactored using concerns as below: Create a attendable.rb and commentable.rb file in app/models/concerns/event folder
* While using concerns its advisable to go for 'domain' based grouping rather than 'technical' grouping. Domain Based grouping is like 'Commentable', 'Photoable', 'Attendable'. Technical grouping will mean 'ValidationMethods', 'FinderMethods' etc
It's worth to mention that using concerns is considered bad idea by many.
- There is some dark magic happening behind the scenes - Concern is patching include method, there is a whole dependency handling system - way too much complexity for something that's trivial good old Ruby mixin pattern.
- Your classes are no less dry. If you stuff 50 public methods in various modules and include them, your class still has 50 public methods, it's just that you hide that code smell, sort of put your garbage in the drawers.
- Codebase is actually harder to navigate with all those concerns around.
- Are you sure all members of your team have same understanding what should really substitute concern?
Concerns are easy way to shoot yourself in the leg, be careful with them.
I felt most of the examples here demonstrating the power of module rather than how ActiveSupport::Concern adds value to module .
You see instance methods ,class methods and included block are less articles about internet dating service messy. Thats one advantage of using ActiveSupport::Concern .
In this example Bar is the module that Host really needs.
But since Bar has dependency with Foo the Host class have to include Foo (but wait why Host want to know about Foo ? can it be avoided arranged mariages and internet dating ?).
So Bar adds dependency everywhere it goes. And order of inclusion also matters here. This adds lot of complexity/dependency to huge code base.
If you are thinking why cant we add Foo dependency in Bar module itself ? That wont work since method_injected_by_foo_to_host_klass have to be injected in class thats including Bar not on Bar module itself.
Is there a problem with consuming alcohol? Of course there’s not—until there is.
That’s a fine line to walk, and sometimes hard even to spot: Most of us would agree that the occasional social drink is relatively harmless, and enjoying a glass of wine with dinner is certainly no crime, yet alcohol consumption can very quickly turn into alcohol addiction , attended by all manner of health problems.
Sadly, we’re not born with any particular knowledge of whether we might be genetically marked for the disease of addiction. Family history can provide some insights, but really, it’s up to individual drinkers to monitor their alcohol consumption and be aware of some warning signs.
So articel on internet dating scams how exactly do you know when your drinking starts to cross the line?
Many of us drink as a way to temporarily forget the anxieties of the arrange marriage vs internet dating day—but when that forgetting turns into actual, significant memory loss, that’s a problem.
If you’re consuming so much alcohol that you frequently black out, or if you have huge stretches of time that you just can’t account for, then you’re drinking to an extent that may well cause permanent brain damage.
There’s an important distinction to make here: There is nothing wrong with drinking to celebrate a happy occasion. Who doesn’t like to clink glasses or pop some champagne when something positive occurs?
It’s when you start drinking in order to drown your blues that you have a real problem—a dependence on alcohol that is unhealthy.
Or, you learn that a social event won’t have drinking and you suddenly find that you don’t wish to attend.
Basically, if drinking is the only way you can enjoy yourself, then you have a potential issue; again, your dependence on alcohol is likely unhealthy.
Have you ever gotten so drunk that you did something really foolish or self-destructive?
If you learn from your mistake and make an effort not to fall into the same trap again, that’s positive.
But if you ultimately don’t care about consequences and just keep drinking like nothing happened, that may point to a real sickness.
Do your closest friends and family members frequently confront you about your drinking?
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