How can I instantiate a model in Lifecycle callbacks different than this? After I delete a record on the parent model I want to delete those associated records of the son model in afterDestroy.
For example:
/**
* Survey.js
*
*/
attributes: {
question: {
type: 'string',
required: true
},
active: {
type: 'boolean'
},
// Below is all specification for relations to another models
answers: {
collection: 'answer',
via: 'answer'
}
},
// Lifecycle Callbacks
afterDestroy: function (destroyedRecords, cb) {
answer.destroy({survey: destroyedRecords[0].id}).exec(function(err, answers) {
console.log(answers);
});
cb();
}
});
With this I received an error that 'answer' is not defined
Solved.
To instantiate a model in Lifecycle callbacks in Sails different than 'this' you need you need to precede the model with sails.models.
For the previous code:
// Lifecycle Callbacks
afterDestroy: function (destroyedRecords, cb) {
sails.models.answer.destroy({survey: destroyedRecords[0].id}).exec(function(err, answers) {
console.log(answers);
});
cb();
Related
Assuming I had the following model, what is the best practice in Sails.js to calculate the sum attribute from one or more non-persistent attributes on the create API call?
In this example I want to extend the default create behaviour of this models API's to accept the additional attributes valueOne and valueTwo, and then calculate the sum attribute based on a simple valueOne + valueTwo calculation.
Ideally without losing the out of the box validation on other fields on the model, e.g name, but not requiring sum to be submitted at the API level, while still being required on the model itself.
api/models/CalculatedData.js
module.exports = {
attributes: {
name: {
type: 'string',
required: true
},
sum: {
type: 'integer',
required: true
}
}
};
There are many ways you could do this.
If there is only one controller where you populate this model, then you could calculate the sum in your controller and pass the result to the model create method.
Or you could have a service that does that for you. Though a better way would be to have a custom model method that populates the model.
module.exports = {
attributes: {
// your attributes
},
customCreate: function (options, cb) {
options.sum = options.values.reduce(function (a, b) {
return a + b;
});
delete options.values;
Model.create(options).exec(cb);
}
};
Edit
A better way is to use a beforeCreate life-cycle callback
module.exports = {
attributes: {
// your attributes
},
beforeCreate: function (options, cb) {
options.sum = options.values.reduce(function (a, b) {
return a + b;
});
delete options.values;
return cb();
}
};
I found this example to use the Node API to apply filters to related models, but I was wondering if it was possible to achieve the same result using REST?
Node Example:
Post.find({
include: {
relation: 'owner', // include the owner object
scope: { // further filter the owner object
fields: ['username', 'email'], // only show two fields
include: { // include orders for the owner
relation: 'orders',
scope: {
where: {orderId: 5} // only select order with id 5
}
}
}
}
}, function() { ... });
The closest version of a REST url I can get to work is:
...?filter[include][owners][orders]
Is it possible to create a REST url that behaves the same way as the above Node example, by limiting the results based on a related model filter... in this case orders?
I have this functions so when I call the Hdates/coming REST API it shows the events with date greater than today and also includes the venues... Hope it helps.
Hdate.coming = function(cb) {
Hdate.find({
where : {
event_date :{gt: Date.now()}
},
include : {
relation: 'event',
scope : {
include: {
relation: 'venue'
}
}
}
}, cb);
};
Hdate.setup = function() {
Hdate.base.setup.apply(this, arguments);
this.remoteMethod('coming', {
description: 'Find Coming Events by Date',
returns: {arg: 'events', root: true},
http: { verb: 'GET' }
});
};
Hdate.setup();
I am trying to give a default association from a user to a pet, whenever a new User created.
Model:: User.js
var User = {
attributes: {
name: {type: 'string'},
// Add a One Way Relation to pet model
pets: {
collection: 'pet'
},
},
/*** This did not work ***/
beforeCreate: function (user, next) {
var defaultPet = {name: 'Default Pet 1'};
Pet.find(defaultPet).exec(function(err, pet) {
user.name = "BEFORECREATE",
user.pets = pet[0].id;
next();
});
},
}
module.exports = User;
However when a new record is created the user.pet is [ ], but user.name is changed to "BEFORECREATE".
How do I get user.pets = [{name: 'Default Pet 1'}] automatically for the new user created?
Or is there a better place for setting such defaults?
----- UPDATE: More info
I am using sails-disk currently.
Model: Pet.js
module.exports = {
attributes: {
name: {
type: 'string',
required: true
}
}
};
You can't add associations to a model in a lifecycle callback like beforeCreate. Currently, Waterline looks for and processes "nested models" like these before lifecycle callbacks run, so by the time beforeCreate is called it's too late. The simplest solution would be to create a User.createUser class method that wraps the logic you want:
createUser: function(data, cb) {
// If there are already pets specified, just use those
if (data.pets) {return User.create(data).exec(cb);}
// Otherwise look up the default pet
Pet.findOne({name:"Default Pet 1"}).exec(function(err,pet) {
// Return in case of error
if (err) {return cb(err);}
// Assuming the default pet exists, attach it
if (pet) {
console.log("SETTING DEFAULT PET", pet.id);
data.pets = [pet.id];
}
// Create the pet
return User.create(data).exec(cb);
});
}
A few notes:
In your example you were setting pets directly to an ID, but since it's a collection you must set it to an array.
If you're using the sails-disk adapter, you'll need to set schema: true in your model for this to work.
The new User model you get back will not be populated; you'll have to do a find with a populate('pets') with the new User ID to get the pet data attached.
I am new to SailsJS and stuck in Data Model as follows:
I have a User model as follows:
module.exports = {
attributes: {
firstName: {
type: 'string'
},
email: {
type: 'email',
required: true
},
password: {
type: 'String'
},
passwordSalt: {
type: 'String'
},
projects:{
collection: 'ProjectMember',
via: 'userId'
}
}
};
Task Model :
module.exports = {
taskName: {
type: 'String'
},
userId: {
model: 'User'
}
};
In Task model, it is getting all fields from User table which is not required while task data is rendered. I was planning to create one more model called TinyUser which stores only required fields to be shown when task data is rendered.
But TinyUser should just refer User table and get required data from it rather than we creating all data for TinyUser manually when user data is created.
Is there any way this can be achieved in Sails?
Thanks in Advance..
I'm not sure about your question, but this will return a list of required attributes for any model
_.find(sails.models.<YOUR MODEL>._attributes, function(attr){return attr.required})
If your intent it to simply remove undesirable fields you can override the toJSON / toObject methods
see
https://github.com/balderdashy/waterline-docs/blob/master/models.md#toobjecttojson-instance-methods
User.find({select:['firstName', 'email']}).exec()
Let's say I have an Invoice model in SailsJS. It has 2 date attributes: issuedAt and dueAt. How can I create a custom validation rule that check that the due date is equal or greater than the issued date?
I tried creating a custom rule, but it seems I cannot access other properties inside a rule.
module.exports = {
schema: true,
types: {
duedate: function(dueAt) {
return dueAt >= this.issuedAt // Doesn't work, "this" refers to the function, not the model instance
}
},
attributes: {
issuedAt: {
type: 'date'
},
dueAt: {
type: 'date',
duedate: true
}
}
};
I hope you found a solution now, but for those interested to a good way to handle this i will explain my way to do it.
Unfortunatly as you said you can't access others record attributes in attribute customs validation function.
#Paweł Wszoła give you the right direction and here is a complete solution working for Sails#1.0.2 :
// Get buildUsageError to construct waterline usage error
const buildUsageError = require('waterline/lib/waterline/utils/query/private/build-usage-error');
module.exports = {
schema: true,
attributes: {
issuedAt: {
type: 'ref',
columnType: 'timestamp'
},
dueAt: {
type: 'ref',
columnType: 'timestamp'
}
},
beforeCreate: (record, next) => {
// This function is called before record creation so if callback method "next" is called with an attribute the creation will be canceled and the error will be returned
if(record.dueAt >= record.issuedAt){
return next(buildUsageError('E_INVALID_NEW_RECORD', 'issuedAt date must be equal or greater than dueAt date', 'invoice'))
}
next();
}
};
beforeCreate method in model as first param takes values. The best place for this kind of validation I see here.
beforeCreate: (values, next){
if (values.dueAt >= values.issuedAt) {
return next({error: ['...']})
}
next()
}