BookshelfJs failing to bring in nested relationship on create - postgresql

Question

Let's say we have a Join table vehicle_inspections and another join table inspection_actions, as well as basic tables for actions, vehicles, andinspections`.
Lets say I desire the following DB entries:
vehicles
----------------------------
id make
----------------------------
1 Toyota
actions
-------------------------------
id description
-------------------------------
2 Check Tire Pressue
inspections
-------------------------------
id location date
-------------------------------
3 New York tomorrow
vehicle_inspections
--------------------------------
vehicle_id inspection_id
--------------------------------
1 3
inspection_actions
--------------------------------
inspection_id action_id
--------------------------------
3 2
and the following bookshelf classes
inspection_actions.js
(function () {
'use strict';
var Repository = require('../repository');
module.exports = Repository.Model.extend({
tableName: 'inspection_actions',
});
})();
vehicle_inspections.js
(function () {
'use strict';
var Repository = require('../repository');
module.exports = Repository.Model.extend({
tableName = 'vehicle_inspections',
inspection: function () {
return this.belongsTo(require('inspection'));
},
fetchOrCreate: function(vehicleId, inspectionId, options) {
var self = this;
return self.query(function (qb) {
qb.where({
vehicle_id: vehicleId,
inspection_id: inspectionId
});
)}.fetch(options || {}).then(function (model) {
if (!model) {
model.save({
vehicle_id: vehicleId,
inspection_id: inspectionId
});
return model;
};
}
};
});
inspection.js
...
module.exports = Repository.Model.extend(_.extend({
tableName: 'inspections',
actions: function () {
return this.hasMany(require('./inspection-action'));
}
}));
And a route:
new VehicleInspection().fetchOrCreate(req.params.vehicle_id, req.params.inspection_id, {withRelated: ['inspection.actions']})
.then(function (vehicleInspection) {
var inspection = vehicleInspection.related('inspection');
console.log( inspection);
console.log(inspection.related(actions);
})
The inspection console log prints out the correct inspection, however, irrelevantly of what is in the database the second console.log prints out an empty result
{ length: 0,
models: [],
_byId: {},
...
targetIdAttribute: 'id',
foreignKey: undefined,
parentId: undefined,
parentTableName: 'tasks',
parentIdAttribute: 'id',
parentFk: undefined } }
This "bad" behaviour only occurs the first time a projectTasks entry is being created. What appears to be happening is that the inspection_action table is not being populated through the nested withRelated. How could I get this working nested create working?

Answer 1

I'm not completely clear what you are trying to achieve, but here is how I would generally set things up. First I'd create a base model (assuming its saved as base.js), I think you are going to have some problems with circular dependencies, so using the Bookshelf registry plugin would be good:
var config = {
client: // whatever client you are using,
connection: // url to your database
};
var db = require('knex')(config);
var Bookshelf = require('bookshelf')(db);
var Base = Bookshelf.Model.extend({
// Put anything here that will be helpful for your use case
});
Bookshelf.plugin('registry');
Base.model = Bookshelf.model.bind(Bookshelf);
module.exports = Base;
Next create your Vehicle model:
require('inspection');
require('action');
var Base = require('base');
var Vehicle = Base.Model.extend({
tableName = 'vehicles',
inspections: function () {
return this.belongsToMany('Inspection',
'inspections_vehicles', 'vehicle_id', 'inspection_id');
},
actions: function() {
return this.belongsToMany('Action',
'actions_vehicles', 'vehicle_id', 'action_id');
}
};
module.exports = Base.model('Vehicle', Vehicle);
Then an inspection model:
require('vehicle');
var Base = require('base');
var Inspection = Base.Model.extend({
tableName = 'inspection',
vehicles: function () {
return this.belongsToMany('Vehicle',
'inspections_vehicles', 'inspection_id', 'vehicle_id');
}
};
module.exports = Base.model('Inspection', Inspection);
Finally an action model:
var Base = require('base');
var Action = Base.Model.extend({
tableName = 'actions',
};
module.exports = Base.model('Action', Action);
Now assuming that the database isn't already filled in with the data you supplied, we can populate it:
var Inspection = require('inspection');
var Vehicle = require('vehicle');
var Action = require('action');
var toyota;
var newYorkInspection
Vehicle.forge().save({name: 'Toyota'})
.then(function(vehicle) {
toyota = vehicle;
return Inspection.forge().save({location: 'New York', date: 'Tomorrow'});
}).then(function(inspection){
newYorkInspection = inspection;
return toyota.inspections().attach(newYorkInspection);
}).then(function() {
return Action.forge().save({description: 'Check Tire Pressure'});
}).then(function(tirePressureAction) {
return toyota.actions().attach(tirePressureAction);
});
Now I can fetch the toyota vehicle with the related actions and inspections:
var Vehicle = require('vehicle');
return Vehicle.forge({'name': 'Toyota'}).fetch({
withRelated: ['inspections', 'actions']
}).then(function(toyota){
var toyotaInspections = toyota.related('inspections');
var toyotaActions = toyota.related('actions');
});