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 the Animal 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 the Animal schema. When you create an instance of the Animal model (e.g., a dog), you can then call findSimilarTypes on that instance to find other animals with the same type. The method uses the this.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 the Animal model.

first sighting: sign-in: problem: forgetting whether an account has been created or not, and in which way

• for: Yuval Noah Harari, Hamas Israel war 2023, global liberal order, abused-abuser cycle, And not Or

• summary

  • In this interview, Yuval Noah Harari offers insights on the trap that Hamas's brutality has set for the Israeli army and reflections on the abused-abuser cycle.
  • If Israeli government falls into that trap and inflicts unprecedented collateral damage, it will scupper the chance for peace for generations to come, and Hamas will have succeeded in its goal.
  • Harari identifies a key insight that could help create better empathy between warring parties, to recognize the abused-abuser cycle and how we can be both abused AND abuser at the same time
  • Harari reflects on the breakdown of the global liberal order, offering a simple yet insightful anthropological definition of the global liberal order showing how in spite of its many flaws, fundamentally is biologically humanistic at the core. What is needed is a way to decouple the harmful features the current form of it possesses

• for: victim AND perpetrator, situatedness, perspectival knowing, AND, not OR, abused-abuser cycle, individual /collective gestalt, Hamas Israel war 2023

• quote

  • It's hard for people to understand that you can be victim and perpetrator at the same time
  • It's a very simple fact impossible to accept for most people
• author: Yuval Noah Harari
• date: Sept 2023

• for: conflict, Israel-Palestine conflict

• comment

  • it's "and", not "or"

"I didn't fully understand it at the time, but throughout my time as a freshman at Boston College I've realized that I have the power to alter myself for the better and broaden my perspective on life. For most of my high school experience, I was holding to antiquated thoughts that had an impact on the majority of my daily interactions. Throughout my life, growing up as a single child has affected the way am in social interactions. This was evident in high school class discussions, as I did not yet have the confidence to be talkative and participate even up until the spring term of my senior year."