- Last 7 days
-
Local file Local fileLayout 11
-
card index systems wereespecially prized for the flexibility in filing that they afforded: not only couldcards bearing superannuated information be easily removed and ones bearingnew information be added, but files could be easily rearranged if needed.
-
- 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
-
- Jan 2023
-
www.complexityexplorer.org www.complexityexplorer.org
-
Hermeneutic circle In traditional humanities scholarship, the hermeneutic circle refers to the way in which we understand some part of a text in terms of our ideas about its overall structure and meaning -- but that we also, in a cyclic fashion, update our beliefs about the overall structure and meaning of a text in response to particular moments.
-
-
ubuntuforums.org ubuntuforums.org
-
Did you see the rest of my post too? If you are reading the replies only in email, don't. Visit the forum and open the thread. Because when we edit a post, you don't receive the modification by email, only the initial post. I added few things to my last one...
-
- Oct 2022
-
github.com github.com
-
passenger-docker images contain an Ubuntu 20.04 operating system. You may want to update this OS from time to time, for example to pull in the latest security updates. OpenSSL is a notorious example. Vulnerabilities are discovered in OpenSSL on a regular basis, so you should keep OpenSSL up-to-date as much as you can. While we release passenger-docker images with the latest OS updates from time to time, you do not have to rely on us. You can update the OS inside passenger-docker images yourself, and it is recommend that you do this instead of waiting for us.
-
- Aug 2022
-
psyarxiv.com psyarxiv.com
-
Swire-Thompson, B., Miklaucic, N., Wihbey, J., Lazer, D., & DeGutis, J. (2021). Backfire effects after correcting misinformation are strongly associated with reliability. PsyArXiv. https://doi.org/10.31234/osf.io/e3pvx
-
-
www.nature.com www.nature.com
-
McDiarmid, A. D., Tullett, A. M., Whitt, C. M., Vazire, S., Smaldino, P. E., & Stephens, J. E. (2021). Psychologists update their beliefs about effect sizes after replication studies. Nature Human Behaviour, 5(12), 1663–1673. https://doi.org/10.1038/s41562-021-01220-7
-
-
-
Swire-Thompson, B., Cook, J., Butler, L., Sanderson, J., Lewandowsky, S., & Ecker, U. (2021). Correction Format has a Limited Role when Debunking Misinformation. PsyArXiv. https://doi.org/10.31234/osf.io/gwxe4
-
- Aug 2021
-
github.com github.com
-
I'd like to update my proposal to be more general, following your answer on Stack Overflow and hack mentioned at the top of #14520
-
- Jun 2021
-
evilmartians.com evilmartians.com
-
Disclaimer: This article is being regularly updated with the best recommendations up to date, take a look at a Changelog section.
-
- May 2021
-
www.impressivewebs.com www.impressivewebs.com
-
I like the idea in theory, however it doesn’t feel very robust – you are relying on the layout of the page in question. Many authors regularly revisit articles and add new sections and paragraphs. Now your #h2:3 link points to a previous section. (This is far less likely to happen with IDs.)
-
- Apr 2021
-
stackoverflow.com stackoverflow.com
-
@H2CO3 Why did you remove your answer? It was the only one explaining what was happening. Or was it incorrect?
not exact match for: removing comment from thread makes other comments not make sense with that context missing
-
-
stackoverflow.com stackoverflow.com
-
The question talks about stdout but the title mentions stdin. I think the title is wrong.
Refers to old title, as seen here
Trick an application into thinking its stdin is interactive
-
- Mar 2021
-
www.chevtek.io www.chevtek.io
-
he goes on to talk about third party problems and how you're never guaranteed something is written correctly or that even if it is you don't know if it's the most optimal solution
-
-
news.ycombinator.com news.ycombinator.com
-
here is my set of best practices.I review libraries before adding them to my project. This involves skimming the code or reading it in its entirety if short, skimming the list of its dependencies, and making some quality judgements on liveliness, reliability, and maintainability in case I need to fix things myself. Note that length isn't a factor on its own, but may figure into some of these other estimates. I have on occasion pasted short modules directly into my code because I didn't think their recursive dependencies were justified.I then pin the library version and all of its dependencies with npm-shrinkwrap.Periodically, or when I need specific changes, I use npm-check to review updates. Here, I actually do look at all the changes since my pinned version, through a combination of change and commit logs. I make the call on whether the fixes and improvements outweigh the risk of updating; usually the changes are trivial and the answer is yes, so I update, shrinkwrap, skim the diff, done.I prefer not to pull in dependencies at deploy time, since I don't need the headache of github or npm being down when I need to deploy, and production machines may not have external internet access, let alone toolchains for compiling binary modules. Npm-pack followed by npm-install of the tarball is your friend here, and gets you pretty close to 100% reproducible deploys and rollbacks.This list intentionally has lots of judgement calls and few absolute rules. I don't follow all of them for all of my projects, but it is what I would consider a reasonable process for things that matter.
-
- Feb 2021
-
stackoverflow.com stackoverflow.com
-
Note: This question has been edited since it was asked. The original title was "Test whether a glob has any matches in bash". The specific shell, 'bash', was dropped from the question after I published my answer. The editing of the question's title makes my answer appear to be in error. I hope someone can amend or at least address this change.
-
- Jul 2020
-
lwn.net lwn.net
-
"that text has been removed from the official version on the Apache site." This itself is also not good. If you post "official" records but then quietly edit them over time, I have no choice but to assume bad faith in all the records I'm shown by you. Why should I believe anything Apache board members claim was "minuted" but which in fact it turns out they might have just edited into their records days, weeks or years later? One of the things I particularly watch for in modern news media (where no physical artefact captures whatever "mistakes" are published as once happened with newspapers) is whether when they inevitably correct a mistake they _acknowledge_ that or they instead just silently change things.
-
-
edpb.europa.eu edpb.europa.eu
-
For example, as the GDPR requires that a controller must be able to demonstrate that valid consentwas obtained, all presumed consents of which no references are kept willautomatically be below theconsent standard of the GDPR and will need to be renewed. Likewise as the GDPR requires a“statement or a clear affirmative action”, all presumed consents that were based on a more impliedform of action by the data subject (e.g.a pre-ticked opt-in box) will also not be apt to the GDPRstandard of consent.
-
-
www.iubenda.com www.iubenda.com
-
The cookie banner will be displayed any time a user visits your site for the first time or when you have decided to add a new vendor to your list of vendors (since it’s a new disclosure and potentially a consent request for that vendor may be required).
-
- May 2020
-
psyarxiv.com psyarxiv.com
-
Swire-Thompson, B., DeGutis, J., & Lazer, D. (2020, May 15). Searching for the backfire effect: Measurement and design considerations. https://doi.org/10.31234/osf.io/ba2kc
-