salix/services/loopback/common/methods/sale/updateQuantity.js

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module.exports = Self => {
Self.remoteMethod('updateQuantity', {
description: 'Changes the quantity of a sale',
accessType: '',
accepts: [{
arg: 'id',
type: 'number',
required: true,
description: 'sale ID',
http: {source: 'path'}
}, {
arg: 'quantity',
type: 'number',
required: true,
description: 'newQuantity'
}],
returns: {
type: 'string',
root: true
},
http: {
path: `/:id/updateQuantity`,
verb: 'post'
}
});
Self.updateQuantity = async(id, quantity) => {
let currentLine = await Self.app.models.Sale.findOne({where: {id: id}, fields: ['quantity']});
if (quantity > currentLine.quantity)
throw new Error('The new quantity should be smaller than the old one');
return await Self.app.models.Sale.update({id: id}, {quantity: quantity});
};
};