- Sep 2024
-
4thgenerationcivilization.substack.com 4thgenerationcivilization.substack.com
-
This industrial religion, evolving from monastic systems to modern enterprises, highlights the continuity between religious structures and capitalist production
for - quote - roots of industrial capitalism - found in medieval monasticism - Michel Bauwens on Pierre Musso - question - what was the impact of monasticism on modern capitalism? How did it become so pathological,?
-
-
github.com github.com
-
Unfortunately, $ method_name -s doesn't work in Pry, but I hope that some day it will get fixed. Just a ref to issue: pry/pry#1756
-
- Jan 2024
-
mongoosejs.com mongoosejs.com
-
Instance methods Instances of Models are documents. Documents have many of their own built-in instance methods. We may also define our own custom document instance methods. // define a schema const animalSchema = new Schema({ name: String, type: String }, { // Assign a function to the "methods" object of our animalSchema through schema options. // By following this approach, there is no need to create a separate TS type to define the type of the instance functions. methods: { findSimilarTypes(cb) { return mongoose.model('Animal').find({ type: this.type }, cb); } } }); // Or, assign a function to the "methods" object of our animalSchema animalSchema.methods.findSimilarTypes = function(cb) { return mongoose.model('Animal').find({ type: this.type }, cb); }; Now all of our animal instances have a findSimilarTypes method available to them. const Animal = mongoose.model('Animal', animalSchema); const dog = new Animal({ type: 'dog' }); dog.findSimilarTypes((err, dogs) => { console.log(dogs); // woof }); Overwriting a default mongoose document method may lead to unpredictable results. See this for more details. The example above uses the Schema.methods object directly to save an instance method. You can also use the Schema.method() helper as described here. Do not declare methods using ES6 arrow functions (=>). Arrow functions explicitly prevent binding this, so your method will not have access to the document and the above examples will not work.
Certainly! Let's break down the provided code snippets:
1. What is it and why is it used?
In Mongoose, a schema is a blueprint for defining the structure of documents within a collection. When you define a schema, you can also attach methods to it. These methods become instance methods, meaning they are available on the individual documents (instances) created from that schema.
Instance methods are useful for encapsulating functionality related to a specific document or model instance. They allow you to define custom behavior that can be executed on a specific document. In the given example, the
findSimilarTypes
method is added to instances of theAnimal
model, making it easy to find other animals of the same type.2. Syntax:
Using
methods
object directly in the schema options:javascript const animalSchema = new Schema( { name: String, type: String }, { methods: { findSimilarTypes(cb) { return mongoose.model('Animal').find({ type: this.type }, cb); } } } );
Using
methods
object directly in the schema:javascript animalSchema.methods.findSimilarTypes = function(cb) { return mongoose.model('Animal').find({ type: this.type }, cb); };
Using
Schema.method()
helper:javascript animalSchema.method('findSimilarTypes', function(cb) { return mongoose.model('Animal').find({ type: this.type }, cb); });
3. Explanation in Simple Words with Examples:
Why it's Used:
Imagine you have a collection of animals in your database, and you want to find other animals of the same type. Instead of writing the same logic repeatedly, you can define a method that can be called on each animal instance to find similar types. This helps in keeping your code DRY (Don't Repeat Yourself) and makes it easier to maintain.
Example:
```javascript const mongoose = require('mongoose'); const { Schema } = mongoose;
// Define a schema with a custom instance method const animalSchema = new Schema({ name: String, type: String });
// Add a custom instance method to find similar types animalSchema.methods.findSimilarTypes = function(cb) { return mongoose.model('Animal').find({ type: this.type }, cb); };
// Create the Animal model using the schema const Animal = mongoose.model('Animal', animalSchema);
// Create an instance of Animal const dog = new Animal({ type: 'dog', name: 'Buddy' });
// Use the custom method to find similar types dog.findSimilarTypes((err, similarAnimals) => { console.log(similarAnimals); }); ```
In this example,
findSimilarTypes
is a custom instance method added to theAnimal
schema. When you create an instance of theAnimal
model (e.g., a dog), you can then callfindSimilarTypes
on that instance to find other animals with the same type. The method uses thethis.type
property, which refers to the type of the current animal instance. This allows you to easily reuse the logic for finding similar types across different instances of theAnimal
model.
Tags
Annotators
URL
-
- Aug 2021
-
4cd.instructure.com 4cd.instructure.com
-
focuses on developing college-level literacy skills. More simply, this course will prepare you for the reading, writing, and critical thinking required of you as a university student.
-
- Nov 2020
-
inst-fs-iad-prod.inscloudgate.net inst-fs-iad-prod.inscloudgate.net
-
To appreciate the social role of Broca and his school,we must recognize that his statements about the brainsof women do not reflect an isolated prejudice toward asingle disadvantaged group. They must be weighed inthe context of a general theory that supportedcontemporary social distinctions as biologicallyordained.
Here's the "So what? Who cares?"
-
- Oct 2020
-
-
I started Solid years ago before I thought anyone would be interested in using it. I only started promoting it because it had already achieved the goals I had set out for it.
-
- Feb 2018
-
www.american.edu www.american.edu
-
younggirls,because those typesoffictionareoften theonlytypestoofferpositive,well-roundedfemale protagonists.When societyshamesyounggirlsfortheirinterests in these kindsofstories,girlsfindthemselvescutofffrompotentialrole models,fromrelatable stories,andfrom a widercommunityofgirlslike themselves.Representation matters,partic
Thesis / Response
-