# Services
# Concept
Services are a set of reusable functions. They are particularly useful to respect the DRY (donβt repeat yourself) programming concept and to simplify controllers logic.
# Core services
When you create a new Content Type
or a new model, you will see a new empty service has been created. It is because Strapi builds a generic service for your models by default and allows you to override and extend it in the generated files.
# Extending a Model Service
Here are the core methods (and their current implementation). You can simply copy and paste this code to your own service file to customize the methods.
You can read about strapi.query
calls here.
TIP
In the following example your controller, service and model are named restaurant
.
# Collection Type
# Single Type
# Custom services
You can also create custom services to build your own business logic.
# How to create a custom service
There are two ways to create a service.
- Using the CLI
strapi generate:service restaurant
.
Read the CLI documentation for more information. - Manually create a JavaScript file named in
./api/**/services/
.
# Example
The goal of a service is to store reusable functions. An email
service could be useful to send emails from different functions in our codebase:
Path β ./api/email/services/Email.js
.
const nodemailer = require('nodemailer');
// Create reusable transporter object using SMTP transport.
const transporter = nodemailer.createTransport({
service: 'Gmail',
auth: {
user: 'user@gmail.com',
pass: 'password',
},
});
module.exports = {
send: (from, to, subject, text) => {
// Setup e-mail data.
const options = {
from,
to,
subject,
text,
};
// Return a promise of the function that sends the email.
return transporter.sendMail(options);
},
};
TIP
please make sure you installed nodemailer
(npm install nodemailer
) for this example.
The service is now available through the strapi.services
global variable. We can use it in another part of our codebase. For example a controller like below:
Path β ./api/user/controllers/User.js
.
module.exports = {
// GET /hello
signup: async ctx => {
// Store the new user in database.
const user = await User.create(ctx.query);
// Send an email to validate his subscriptions.
strapi.services.email.send('welcome@mysite.com', user.email, 'Welcome', '...');
// Send response to the server.
ctx.send({
ok: true,
});
},
};