I'm building a rest api that uses Sequelize to interact with the database. A query looks like this:
function read_category(req, res) {
Category.findById(req.params.categoryId, {rejectOnEmpty: true}).then(category => {
res.json(category);
}).catch(Sequelize.EmptyResultError, function () {
res.status(404).json({message: 'No category found'});
}
).catch(function (err) {
res.send(err);
}
);
}
Now I want the category object that is returned from Sequelize and then returned to the user to include the linkto the ressource. I could do:
category.dataValues.link = config.base_url + 'categories/' + category.dataValues.id;
Which would result in:
{
"id": 1,
"name": "TestCategory 1",
"position": 1,
"createdAt": "2018-08-19T11:42:09.000Z",
"updatedAt": "2018-08-19T11:42:09.000Z",
"link": "http://localhost:3000/categories/1"
}
Since I have more routes than this one I'm wondering if there's a dynamic way to add the link property to every category. I don't want to save it in the database because the base-url might differ.
Thanks!
Better way to do it is , create a getter method :
const Category = sequelize.define( 'category' , {
....
your_fields
....
},
{
getterMethods:{
link() {
return config.base_url + 'categories/' + this.id;
}
}
});
module.exports = Category;
Then
Category.findAll(...).then(categories => {
// Now there is no need to append data manually , it will added each time when you query
console.log(categories); // <-- Check the output
})
Related
I've been stressing around trying to fix this and I've burnt myself out. I'm calling my serverless mysql trying to get kanbans from teams. I've used this method multiple times and all were working fine but that is most likely because of they only return single item whilst this returns multiple items.
This is my code which returns empty object.
async function getKanbans(team_id){
let kanbans = [];
await sql_query(`SELECT id, sName FROM table WHERE iTeam = ?`, [team_id])
.then(result => {
result.forEach(kanban => {
// console.log(kanban);
kanbans.push({
id: kanban.id,
name: kanban.sName
});
});
})
.catch(err => {
console.log(err);
});
console.log(kanbans);
return kanbans;
}
As you can see.. I am trying to print kanbans and I do get:
[
{ id: 1, name: 'Kanban_1' },
{ id: 2, name: 'Kanban_2' }
]
of out it. Then I'm trying to return it to the item that called this function and this is how that looks like:
teams.push({
id : team.id,
sName : team.sName,
sColor : team.sColor,
aKanbans : result[0]['selectedTeam'] == team.id ? getKanbans(team.id) : null,
});
(a small snippet of something bigger)
Okay, so now when I try and look at the data response (from the frontend) I get this:
{
"success": true,
"message": "Found teams",
"teams": [
{
"id": 1,
"sName": "Team1",
"sColor": "#fcba03",
"aKanbans": {}
},
{
"id": 2,
"sName": "Team2",
"sColor": "#2200ff",
"aKanbans": null
}
]
}
aKanbans from Team1 is empty, empty object. What the **** do I do? I tried mapping it and still got an empty object. React/javascript is not my main language, I just like to learn. Any suggestions?
You are mixing async / await function with normal Promises handling.
Try to change your getKanbans code like this:
async function getKanbans(team_id) {
let kanbans = [];
try {
const result = await sql_query(
`SELECT id, sName FROM table WHERE iTeam = ?`,
[team_id]
);
result.forEach((kanban) => {
kanbans.push({
id: kanban.id,
name: kanban.sName,
});
});
} catch (err) {
console.log(err);
}
return kanbans;
}
And then populate the teams using (declare the parent async):
teams.push({
id : team.id,
sName : team.sName,
sColor : team.sColor,
aKanbans : result[0]['selectedTeam'] == team.id ? getKanbans(team.id) : null,
});
I am using node.js as server language and Mysql as database so I am running query and getting data from database but is is showing in format like this
[ BinaryRow { name: 'Dheeraj', amount: '77.0000' },
BinaryRow { name: 'Raju', amount: '255.0000' } ]
What I want is
['Dheeraj', 77.0000],
['Raju', 66255.000030],
This what I am doing in my backend (node.js):
My model:
static getChartData(phoneNo, userType) {
let sql = 'select businessname as name,sum(billamt) amount from cashbackdispdets where consphoneno =' + phoneNo + ' group by businessid order by tstime desc limit 10'
return db.execute(sql, [phoneNo]);
My controller:
exports.getColumnChart = function(req, res) {
const phoneNo = req.body.userId
const userType = req.body.userType
console.log(phoneNo)
dashboardModule.getChartData(phoneNo, userType)
.then(([rows]) => {
if (rows.length > 0) {
console.log(rows)
return res.json(rows)
} else {
console.log("error")
return res.status(404).json({ error: 'Phone No. already taken' })
}
})
.catch((error) => {
console.log(error)
return res.status(404).json({ error: 'Something went wrong !!' })
})
}
I am sending this data to Ui and when I am receiving it on UI it is in the form of object inside array which is not the required data type I want
axios().post('/api/v1/Dashboard/DashboardColumnChart',this.form)
.then(res=>{
console.log(res.data)
debugger
this.chartData= res.data
})
The above code consoles on browser like
I am not getting any idea how o do it should I do it with backend or with front end and how
Nodejs will send you a JSON response if you want to change it. It is better to change or maniuplate it in a Front end framework. But if you want to change it in backend as you have asked Make sure that the rows is in the format that you want to recive.
let data = [
{ "name": "Dheeraj", "amount": "77.0000" },
{ "name": "Raju", "amount": "255.0000" }
]
// empty array to store the data
let testData = [];
data.forEach(element => {
testData.push(element.name)
});
You can format it using array.map and Object.values. map functions loops over each element and returns a modified element according to the callback provided. Object.values simply returns all the values of an object in an array.
const data = [ { "name": "Dheeraj", "amount": "77.0000" }, { "name": "Raju", "amount": "255.0000" } ];
const formattedData = data.map(obj => Object.values(obj));
console.log("Initial Data: ", data);
console.log("Formatted Data: ", formattedData);
// Map function example
const a = [1,2,3]
const mappedA = a.map(e => e * 2)
console.log(a, " mapped to: ", mappedA);
// Object.values example
const b = { firstName: 'John', lastName: 'Doe', number: '120120' }
console.log(Object.values(b));
What should be the proper way of storing / handling repeating events in the redux store ?
Problem: Let's say that we have a backend API that generates repeating events trough a complicated business logic.Some of the events might have the same ID. Lets say that generated output looks this way :
[
{
"id": 1,
"title": "Weekly meeting",
"all_day": true,
"starts_at": "2017-09-12",
"ends_at": "2017-09-12"
},
{
"id": 3,
"title": "Daily meeting1",
"all_day": false,
"starts_at": "2017-09-12",
"ends_at": "2017-09-12",
},
{
"id": 3,
"title": "Daily meeting1",
"all_day": false,
"starts_at": "2017-09-13",
"ends_at": "2017-09-13",
},
{
"id": 3,
"title": "Daily meeting1",
"all_day": false,
"starts_at": "2017-09-14",
"ends_at": "2017-09-14",
}
]
Possible solution would be: generate unique ID by having additional property uid composed like this: id + # + starts_at. This way we could identify each occurrence uniquely. (I'm using this right now)
Example:
[
{
"id": 1,
"uid": "1#2017-09-12",
"title": "Weekly meeting",
"all_day": true,
"starts_at": "2017-09-12",
"ends_at": "2017-09-12"
}
]
I'm wondering is there some other way, maybe more elegant than having composed unique id ?
There is a possible pitfall with your current solution. What will happen if id and start_id of two events will be the same? Is it possible scenario in your domain?
Because of that I usually use this nice lib in such cases. It produces really short unique ids, which have some nice properties, like guaranties not to intersect, to be unpredictable and so on.
Also ask yourself if you actually need unique ids in your case. Looks like your back-end have no chance to distinguish events anyways, so why bother? Redux store will happily keep your events event without uid.
Maybe not much of an improvement (if at all) but just using JSON.stringify to check for duplicates could make unique id's obsolete.
const existingEvents = [
{
"id": 3,
"title": "Daily meeting1",
"all_day": false,
"starts_at": "2017-09-14",
"ends_at": "2017-09-14",
}
];
const duplicate = {
"id": 3,
"title": "Daily meeting1",
"all_day": false,
"starts_at": "2017-09-14",
"ends_at": "2017-09-14",
};
const eventIsDuplicate = (existingEvents, newEvent) => {
const duplicate =
existingEvents.find(event => JSON.stringify(event) == JSON.stringify(newEvent));
return typeof duplicate != 'undefined';
};
console.log(eventIsDuplicate(existingEvents, duplicate)); // true
I guess this would only be preferable to your existing solution if, for some reason, you'd want to keep all the uniqueness logic on the client side.
As far as I understand the examples you've given, it seems like the server is sending a particular event whenever the details of the event change.
If that is so, and you want to track the changes to events, your might shape might be an array of objects with all the fields of the event that hold the current data, and a history property which is an array of all previous (or n most recent) event objects and the timestamps at which they were received. This is how your reducers would look, storing only the five most recent event changes for each event. I'm expecting the action to have a payload property which has your standard event property and a timestamp property, which can be easily accomplished in the action creator.
const event = (state = { history: [] }, action) => {
switch (action.type) {
case 'EVENT_FETCHED':
return ({
...action.payload.event,
history: [...state.history, action.payload].slice(-5),
});
default:
return state;
}
};
const events = (state = { byID: {}, IDs: [] }, action) => {
const id = action.payload.event.ID;
switch (action.type) {
case 'EVENT_FETCHED':
return id in state.byID
? {
...state,
byID: { ...state.byID, [id]: event(state.byID[id], action) },
}
: {
byID: { ...state.byID, [id]: event(undefined, action) },
IDs: [id],
};
default:
return state;
}
};
Doing this, you don't need any unique ID. Please let me know if I have misunderstood your problem.
Edit: This is a slight extension of the pattern in the Redux documentation, to store previous events.
At the end this is what I've implemented (for demonstration purpose only - unrelated code is omitted):
eventRoot.js:
import { combineReducers } from 'redux'
import ranges from './events'
import ids from './ids'
import params from './params'
import total from './total'
export default resource =>
combineReducers({
ids: ids(resource),
ranges: ranges(resource),
params: params(resource)
})
events.js:
import { GET_EVENTS_SUCCESS } from '#/state/types/data'
export default resource => (previousState = {}, { type, payload, requestPayload, meta }) => {
if (!meta || meta.resource !== resource) {
return previousState
}
switch (type) {
case GET_EVENTS_SUCCESS:
const newState = Object.assign({}, previousState)
payload.data[resource].forEach(record => {
// ISO 8601 time interval string -
// http://en.wikipedia.org/wiki/ISO_8601#Time_intervals
const range = record.start + '/' + record.end
if (newState[record.id]) {
if (!newState[record.id].includes(range)) {
// Don't mutate previous state, object assign is only a shallow copy
// Create new array with added id
newState[record.id] = [...newState[record.id], range]
}
} else {
newState[record.id] = [range]
}
})
return newState
default:
return previousState
}
}
There is also a data reducer but it's linked in parent reducer due to generic implementation that is re-used for common list responses. Events data are updated and start/end property is removed as it's composed by range (ISO 8601 time interval string). This can be later used by moment.range or split by '/' to get start/end data. I've opted for array of range strings to simplify checking of existing ranges, as they might grow large. I think that primitive string comparison (indexOf or es6 includes) would be faster than looping over complex structure in such cases.
data.js (stripped down version):
import { END } from '#/state/types/fetch'
import { GET_EVENTS } from '#/state/types/data'
const cacheDuration = 10 * 60 * 1000 // ten minutes
const addRecords = (newRecords = [], oldRecords, isEvent) => {
// prepare new records and timestamp them
const newRecordsById = newRecords.reduce((prev, record) => {
if (isEvent) {
const { start, end, ...rest } = record
prev[record.id] = rest
} else {
prev[record.id] = record
}
return prev
}, {})
const now = new Date()
const newRecordsFetchedAt = newRecords.reduce((prev, record) => {
prev[record.id] = now
return prev
}, {})
// remove outdated old records
const latestValidDate = new Date()
latestValidDate.setTime(latestValidDate.getTime() - cacheDuration)
const oldValidRecordIds = oldRecords.fetchedAt
? Object.keys(oldRecords.fetchedAt).filter(id => oldRecords.fetchedAt[id] > latestValidDate)
: []
const oldValidRecords = oldValidRecordIds.reduce((prev, id) => {
prev[id] = oldRecords[id]
return prev
}, {})
const oldValidRecordsFetchedAt = oldValidRecordIds.reduce((prev, id) => {
prev[id] = oldRecords.fetchedAt[id]
return prev
}, {})
// combine old records and new records
const records = {
...oldValidRecords,
...newRecordsById
}
Object.defineProperty(records, 'fetchedAt', {
value: {
...oldValidRecordsFetchedAt,
...newRecordsFetchedAt
}
}) // non enumerable by default
return records
}
const initialState = {}
Object.defineProperty(initialState, 'fetchedAt', { value: {} }) // non enumerable by default
export default resource => (previousState = initialState, { payload, meta }) => {
if (!meta || meta.resource !== resource) {
return previousState
}
if (!meta.fetchResponse || meta.fetchStatus !== END) {
return previousState
}
switch (meta.fetchResponse) {
case GET_EVENTS:
return addRecords(payload.data[resource], previousState, true)
default:
return previousState
}
}
This can be then used by an calendar component with event selector:
const convertDateTimeToDate = (datetime, timeZoneName) => {
const m = moment.tz(datetime, timeZoneName)
return new Date(m.year(), m.month(), m.date(), m.hour(), m.minute(), 0)
}
const compileEvents = (state, filter) => {
const eventsRanges = state.events.list.ranges
const events = []
state.events.list.ids.forEach(id => {
if (eventsRanges[id]) {
eventsRanges[id].forEach(range => {
const [start, end] = range.split('/').map(d => convertDateTimeToDate(d))
// You can add an conditional push, filtered by start/end limits
events.push(
Object.assign({}, state.events.data[id], {
start: start,
end: end
})
)
})
}
})
return events
}
And here is how the data structure looks in the redux dev tools:
Each time the events are fetched, their data is updated (if there is a change) and references are added. Here is an screenshot of redux diff after fetching new events range:
Hope this helps somebody, I'll just add that this still isn't battle tested but more a proof of a concept that's working.
[EDIT] Btw. I'll probably move some of this logic to the backend as then there will be no need to split / join / delete properties.
I have a model City which hasMany CitiesDescriptions.
I would like to update City, but whenever the data contains CitiesDescriptions I would like them to be updated as well.
This is what my data looks like:
{
"id": 4263,
"name": "Accra",
"country_id": 9,
"slug": "accra-5",
"code": "ACD",
"hdo_code": "",
"tourico_code": null,
"active": true,
"CitiesDescriptions": [
{
"id": 1,
"lang": "es",
"description": "text text"
}
]
}
So, in this case I want the data within CitiesDescriptions to be updated.
In the case that one of the objects inside CitiesDescriptions is a new record (doesn't have ID) I want it to be created.
Anyway, I haven't found a way to do this, whatever I found fails in some way. The closest I found that almost works is this:
var city = models.City.build(params, {
isNewRecord : false,
include : [models.CitiesDescription]
});
Promise.all([
city.save(),
city.CitiesDescriptions.map(function (description) {
if (description.getDataValue('id')) {
return description.save();
} else {
description.city_id = city.id;
return models.CitiesDescription.create(description.dataValues);
}
})
]).then(function(results) {
res.send(results);
});
This works except with the data doesn't have a CitiesDescriptions key.
Still, looks way to complicated to do, specially if tomorrow I have more associated models.
Isn't there any way to do this without so much hassle?
EDIT:
Couldnt find a solution, I made this and it works as intended.
var params = req.body;
var promises = [];
promises.push(models.City.update(params, {
where: {
id: parseInt(req.params.id)
}
}));
if(params.CitiesDescriptions) {
promises.push(
params.CitiesDescriptions.map(function (description) {
return models.CitiesDescription.upsert(description, {individualHooks: true});
})
);
}
Promise.all(promises).then(function(results) {
res.send(results);
});
I need to output a count of items from JSON by category (using .length I believe), and would like to manage this in a controller so I can place it to scope anywhere I want. How can I filter REST JSON in a controller?
My sample JSON is as follows:
[
{
"id": "66D5069C-DC67-46FC-8A51-1F15A94216D4",
"articletitle": "artilce1",
"articlecategoryid": 1,
"articlesummary": "article 1 summary. "
},
{
"id": "66D5069C-DC67-46FC-8A51-1F15A94216D5",
"articletitle": "artilce2",
"articlecategoryid": 2,
"articlesummary": "article 2 summary. "
},
{
"id": "66D5069C-DC67-46FC-8A51-1F15A94216D6",
"articletitle": "artilce3",
"articlecategoryid": 3,
"articlesummary": "article 3 summary. "
},
{
"id": "66D5069C-DC67-46FC-8A51-1F15A94216D7",
"articletitle": "artilce4",
"articlecategoryid": 1,
"articlesummary": "article 3 summary. "
},
]
My Resource is as follows:
// Articles by ID
pfcServices.factory('pfcArticles', ['$resource', function ($resource) {
return $resource('https://myrestcall.net/tables/articles', {},
{
'update': { method:'PATCH'}
});
}]);
My Controller is as follows:
// Count number of total articles
pfcControllers.controller('pfcArticleCountCtrl', ['$scope', 'pfcArticles', function ($scope, pfcArticles) {
$scope.articlecount = pfcArticles.query();
I believe I would need to add something to the controller (ex. $scope.cat1 = filter(my logic to get my category here), but am a little lost on how to query this so I have a count of items per category.
Build a filter like this.
angular.module('FilterModule', [])
.filter( 'cat1', function() {
return function(yourJSON) {
var count = 0;
yourJSON.forEach(function(item) {
switch(item.articlecategoryid) {
case 1:
count++;
break;
default:
console.log('item is not of category 1');
}
});
return count;
};
});
Inject the $filter service and fetch the cat1 filter. Now you can use it as $scope.cat1 = $filter('cat1')(yourJSON);