How in graphql get last 3 element - express

How in graphql.js get last 3 created_at element from mysql db table?
I use sequelize.js
Like this:
query: '{
elements(last:3){
id
}
}'
This is my file db.js
const Conn = new Sequelize(/*connection config*/);
Conn.define('elements', {
id: {
type: Sequelize.STRING(36),
primaryKey: true,
allowNull: false
}
});
export default Conn;
This is my file schema.js
const Query = new GraphQLObjectType({
name: 'Query',
description: 'Root query object',
fields() {
return {
elements: {
type: new GraphQLList(Element),
args: {
id: {
type: GraphQLString
}
},
resolve (root, args) {
return Db.models.elements.findAll({ where: args });
}
}
}
}
});


it must be like this;
...
return Db.models.elements.findAll({
limit: 3,
where: args,
order: [['created_at', 'DESC']]
});
http://docs.sequelizejs.com/manual/tutorial/querying.html#pagination-limiting
http://docs.sequelizejs.com/manual/tutorial/querying.html#ordering

Related

sequelize findandcountall function return same data when using pagination

I am using sequelize: 6.9.0, sequelize-cli: ^6.3.0, express: 4.17.1, pg: 8.7.1
i have a problem when using sequelize findAndCountAll, when i using include other models it will return same data when i'm using paging.
Here is my code for House Table
index: async (req, res) => {
const { page, size, developer, city, priceone, pricetwo, project, isNew } =
req.query;
const { limit, offset } = getPagination(page, size);
try {
let filter = {};
if (developer) {
filter.developerId = developer;
}
if (city) {
filter.cityId = city;
}
if (project) {
filter.projectId = project;
}
if (isNew) {
filter.isNew = isNew;
}
if (priceone && pricetwo) {
const firstPrice = parseInt(priceone);
const secondPrice = parseInt(pricetwo);
if (firstPrice === 100000000 && secondPrice === 100000000) {
filter.price = { [Op.lte]: firstPrice };
} else if (firstPrice === 2000000000 && secondPrice === 2000000000) {
filter.price = { [Op.gte]: firstPrice };
} else {
filter.price = { [Op.between]: [firstPrice, secondPrice] };
}
}
const HousesData = await Houses.findAndCountAll({
limit,
offset,
where: filter,
attributes: [
"id",
"name",
"description",
"location",
"price",
"tanah",
"bangunan",
"lantai",
"kamar_tidur",
"kamar_mandi",
"isNew",
],
include: [
{ model: Developers, attributes: ["id", "name"] },
{ model: Cities, attributes: ["id", "name"] },
{ model: Projects, attributes: ["id", "name"] },
],
});
if (HousesData) {
const response = getPagingData(HousesData, page, limit);
res.status(200).json({
status: "success",
message: "Data Available",
data: response,
});
} else {
res.status(200).json({
status: "success",
message: "There is No Data",
data: "No Data",
});
}
} catch (error) {
console.log(error);
return next(
new HttpError(
"Something went wrong, could not get project.",
500,
error
)
);
}
}
my paging function
const getPagination = (page, size) => {
const newPage = page ? page - 1 : 0;
const limit = size ? +size : 10;
const offset = newPage != 0 ? newPage * limit : 0;
return { limit, offset };
};
const getPagingData = (data, page, limit) => {
const { count: totalItems, rows: dataRows } = data;
const currentPage = page ? +page : 1;
const totalPages = Math.ceil(totalItems / limit);
return { totalItems, totalPages, currentPage, dataRows };
};
module.exports = { getPagination, getPagingData };
Let's say i have 10 data
a,b,c,d,e,f,g,h,i,j
if i see first page
http://localhost:3006/api/v1/house?size=5&page=1
it will return a,b,c,d,e (this is right)
and if i see next page
http://localhost:3006/api/v1/house?size=5&page=2
it will return e,d,c,b,a (only reverse not showing f,g,h,i,j)
and if i see all the data it will return correct data
http://localhost:3006/api/v1/house?size=10&page=1
it will return j,i,h,g,f,e,d,c,b,a
but if i disabled
include: [
{ model: Developers, attributes: ["id", "name"] },
{ model: Cities, attributes: ["id", "name"] },
{ model: Projects, attributes: ["id", "name"] },
],
it return the right data when use paging.
my model for House is here
"use strict";
module.exports = {
up: async (queryInterface, Sequelize) => {
await queryInterface.createTable("Houses", {
id: {
allowNull: false,
primaryKey: true,
type: Sequelize.STRING(22),
},
name: {
type: Sequelize.STRING,
},
projectId: {
type: Sequelize.STRING(22),
onDelete: "CASCADE",
references: {
model: "Projects",
key: "id",
},
},
cityId: {
type: Sequelize.STRING(22),
onDelete: "CASCADE",
references: {
model: "Cities",
key: "id",
},
},
developerId: {
type: Sequelize.STRING(22),
onDelete: "CASCADE",
references: {
model: "Developers",
key: "id",
},
},
description: {
type: Sequelize.TEXT,
},
location: {
type: Sequelize.STRING,
},
price: {
type: Sequelize.BIGINT,
},
tanah: {
type: Sequelize.INTEGER,
},
bangunan: {
type: Sequelize.INTEGER,
},
lantai: {
type: Sequelize.INTEGER,
},
kamar_tidur: {
type: Sequelize.INTEGER,
},
kamar_mandi: {
type: Sequelize.INTEGER,
},
house_thumbnail: {
type: Sequelize.STRING,
},
isNew: {
type: Sequelize.BOOLEAN,
},
createdAt: {
allowNull: false,
type: Sequelize.DATE,
},
updatedAt: {
allowNull: false,
type: Sequelize.DATE,
},
});
},
down: async (queryInterface, Sequelize) => {
await queryInterface.dropTable("Houses");
},
};
i also use same paging method on other table. but other table works fine, only this table that got messed up.
the other table named Project function is here for reference
index: async (req, res) => {
const { page, size, developer, city, priceone, pricetwo } = req.query;
const { limit, offset } = getPagination(page, size);
try {
let filter = { haveDeveloper: true };
if (developer) {
filter.developerId = developer;
}
if (city) {
filter.cityId = city;
}
if (priceone && pricetwo) {
const firstPrice = parseInt(priceone);
const secondPrice = parseInt(pricetwo);
if (firstPrice === 100000000 && secondPrice === 100000000) {
filter.minPrice = { [Op.lte]: firstPrice };
} else if (firstPrice === 2000000000 && secondPrice === 2000000000) {
filter.minPrice = { [Op.gte]: firstPrice };
} else {
filter.minPrice = { [Op.between]: [firstPrice, secondPrice] };
}
}
const projectsData = await Projects.findAndCountAll({
limit,
offset,
where: filter,
attributes: ["id", "name", "image", "location",'minPrice'],
include: [
{ model: Cities, attributes: ["id", "name"] },
{ model: Developers, attributes: ["id", "name"] },
{ model: ProjectFacilities, attributes: ["facility"] },
],
});
if (projectsData) {
const response = getPagingData(projectsData, page, limit);
res.status(200).json({
status: "success",
message: "Data Available",
data: response,
});
} else {
res.status(200).json({
status: "success",
message: "There is No Data",
data: "No Data",
});
}
} catch (error) {
console.log(error);
return next(
new HttpError(
"Something went wrong, could not get project.",
500,
error
)
);
}
},
the Project model
'use strict';
const {
Model
} = require('sequelize');
module.exports = (sequelize, DataTypes) => {
class Projects extends Model {
/**
* Helper method for defining associations.
* This method is not a part of Sequelize lifecycle.
* The `models/index` file will call this method automatically.
*/
static associate(models) {
// define association here
Projects.belongsTo(models.Developers, { foreignKey: 'developerId' })
Projects.belongsTo(models.Cities, { foreignKey: 'cityId' })
Projects.hasMany(models.ProjectFacilities, { foreignKey: 'projectId' })
Projects.hasMany(models.Houses, { foreignKey: 'projectId' })
}
};
Projects.init({
name: DataTypes.STRING,
image: DataTypes.STRING,
description: DataTypes.TEXT,
location: DataTypes.STRING,
minPrice:DataTypes.BIGINT,
haveDeveloper: DataTypes.BOOLEAN,
cityId: DataTypes.STRING,
developerId: DataTypes.INTEGER
}, {
sequelize,
modelName: 'Projects',
});
return Projects;
};
sql generated by sequelize for House page 1 with 5 data
SELECT "Houses"."id", "Houses"."name", "Houses"."description", "Houses"."location", "Houses"."price", "Houses"."tanah", "Houses"."bangunan", "Houses"."lantai", "Houses"."kamar_tidur", "Houses"."kamar_mandi", "Houses"."isNew", "Developer"."id" AS "Developer.id", "Developer"."name" AS "Developer.name", "City"."id" AS "City.id", "City"."name" AS "City.name", "Project"."id" AS "Project.id", "Project"."name" AS "Project.name" FROM "Houses" AS "Houses" LEFT OUTER JOIN "Developers" AS "Developer" ON "Houses"."developerId" = "Developer"."id" LEFT OUTER JOIN "Cities" AS "City" ON "Houses"."cityId" = "City"."id" LEFT OUTER JOIN "Projects" AS "Project" ON "Houses"."projectId" = "Project"."id" LIMIT 5 OFFSET 0;
sql generated by sequelize for Project page 1 with 5 data
SELECT "Projects".*, "City"."id" AS "City.id", "City"."name" AS "City.name", "Developer"."id" AS "Developer.id", "Developer"."name" AS "Developer.name", "ProjectFacilities"."id" AS "ProjectFacilities.id", "ProjectFacilities"."facility" AS "ProjectFacilities.facility" FROM (SELECT "Projects"."id", "Projects"."name", "Projects"."image", "Projects"."location", "Projects"."minPrice", "Projects"."cityId", "Projects"."developerId" FROM "Projects" AS "Projects" WHERE "Projects"."haveDeveloper" = true LIMIT 5 OFFSET 0) AS "Projects" LEFT OUTER JOIN "Cities" AS "City" ON "Projects"."cityId" = "City"."id" LEFT OUTER JOIN "Developers" AS "Developer" ON "Projects"."developerId" = "Developer"."id" LEFT OUTER JOIN "ProjectFacilities" AS "ProjectFacilities" ON "Projects"."id" = "ProjectFacilities"."projectId";
is there any solution for this? thank you very much for your all help and attention!

Please try thi
const getPagination = (page = 1, size = 10) => {
const offset = (page - 1) * size ;
const limit = size ;
return { limit, offset };
};

Vue Apollo "__typename" is undefined in updateQuery

I'm attempting to create a "Show More" button for my posts index. The index query loads fine with the first 5 posts, when I click the Show More button I can see new posts being returned, however I receive a bunch of errors like:
Missing field id in {
"__typename": "Post",
"posts": [
{
"id": "5f2b26600c3ec47b279d8988",
"title":
I receive one of each of these errors pretty much for each post attribute (id, title, content, slug, etc). This prevents the actual new posts from being added to the index. What causes this issue?
<script>
import postsQuery from '~/apollo/queries/blog/posts';
const pageSize = 5;
export default {
name: 'BlogIndex',
data: () => ({
loadingMorePosts: false,
page: 0,
pageSize,
}),
apollo: {
postsCount: {
prefetch: true,
query: postsQuery,
variables: {
page: 0,
pageSize,
}
},
posts: {
prefetch: true,
query: postsQuery,
variables: {
page: 0,
pageSize,
}
},
},
computed: {
morePosts() {
return this.posts.length < this.postsCount.aggregate.totalCount;
}
},
methods: {
async fetchMorePosts() {
this.page += this.pageSize;
this.$apollo.queries.posts.fetchMore({
variables: {
page: this.page,
pageSize,
},
updateQuery: (previousResult, { fetchMoreResult }) => {
const newPosts = fetchMoreResult.posts;
console.log('typename: ', previousResult.posts.__typename); <--- returns undefined
if (!newPosts.length) return previousResult;
return {
posts: {
__typename: previousResult.posts.__typename,
posts: [...previousResult.posts, ...newPosts],
}
}
}
})
},
},
}
</script>
UPDATE: added imported posts query
query Posts($page: Int!, $pageSize: Int!) {
posts(
start: $page
limit: $pageSize
sort: "published_at:desc"
where: { published: true }
) {
id
title
content
slug
published
createdAt
updatedAt
published_at
}
postsCount: postsConnection(where: { published: true }) {
aggregate {
totalCount
}
}
}

I think the problem is here:
return {
posts: {
__typename: previousResult.posts.__typename,
posts: [...previousResult.posts, ...newPosts],
}
}
I'm pretty sure __typename is supposed to belong to each post object, not part of the collection of posts. Let me know how if something like this fixes it:
return {
posts: {
posts: [...previousResult.posts, ...newPosts]
}
}
and changing the query to:
query Posts($page: Int!, $pageSize: Int!) {
posts(
start: $page
limit: $pageSize
sort: "published_at:desc"
where: { published: true }
) {
__typename // add this here
id
title
content
slug
published
createdAt
updatedAt
published_at
}
postsCount: postsConnection(where: { published: true }) {
aggregate {
totalCount
}
}
}

Ant Design Vue | Upload in Form | How to set initialValue

I'm having problems defining the initialValue in an Upload component, other thing I tried was using a watcher and updating the formValue and the method that update the props FileList. ¿Someone has any idea how this work?
Parent.vue
<Child :file="file"/>
...
async loadFile(item) {
this.loading = true
const { data } = await axios(..., {
...
responseType: 'blob',
})
const file = new File([data], item.name, { type: data.type });
this.file= {
Id: item.id,
Type: item.attributes.type,
IsPublic: item.attributes.is_public,
Descr: item.attributes.descr,
File: [file]
}
this.showForm();
this.loading = false
},
Children.vue
<a-upload
:accept="formats"
:before-upload="beforeUploadEvt"
:disabled="!formats"
:remove="removeFileEvt"
v-decorator="[
'File',
{
valuePropName: 'fileList',
getValueFromEvent: getValueEvt,
rules: [{ required: true, message: 'Select a file' }]
},
]" >
<a-button> <a-icon type="upload" /> Select a file</a-button>
</a-upload>
methods: {
beforeUploadEvt(file) {
this.form.setFieldsValue({
File: [file]
});
return false;
},
removeFileEvt() {
this.formulario.setFieldsValue({
Archivo: []
});
},
getValueEvt(e) {
if (Array.isArray(e)) {
return e;
}
if(e && e.fileList.length > 1) {
return e && [e.fileList[1]];
}
return e && e.fileList;
},
},
watch: {
adjunto: {
immediate: true,
deep: true,
handler(obj) {
if(obj.File) {
this.getValueEvt(obj.File);
// this.formulario.setFieldsValue({
// File: obj.File
// });
}
}
}
}
Trying the most basic example I could think, using the property defaultFileList
<a-upload
:accept="formats"
:before-upload="beforeUploadEvt"
:disabled="!format"
:remove="removeFileEvt"
:default-file-list="this.file.File">
<a-button> <a-icon type="upload" /> Select file</a-button>
</a-upload>
And then, this is the console warnings and errors I got, so seems to be something about type.

If anyone still seeking for an answer for this. You don't need to load file, wrapping your data in appropriate object helps. As in this example
fileList: [{
uid: '-1',
name: 'image.png',
status: 'done',
url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
}]
<a-upload
....
:file-list="fileList"
>

node sequelize - select with null value

var where = {
[Op.or]:
[
{ status: { [Op.ne]: 'disable' } },
{ status: { [Op.eq]: null } }
],
}
db.diagnostic.findAll({ where: where }).then(resp => {
res.send(resp)
})
This above code is working
but,
var where = {
status: { [Op.ne]: 'disable' } // I want use only this code instead of `or`
}
db.diagnostic.findAll({ where: where }).then(resp => {
res.send(resp)
})
I want to use only status: { [Op.ne]: 'disable' }

Model: diagnostic.js
...
status: {
type: DataTypes.STRING,
defaultValue: "enable", // <- default value will solve my problem
}
...

Mongoose's populate method breaks promise chain?

So I have a mongoose Schema that looks like this:
var Functionary = new Schema({
person: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Person'
},
dateOfAssignment: Date,
dateOfDischarge: Date,
isActive: Boolean
});
var PositionSchema = new Schema({
name: String,
description: String,
maxHeadCount: Number,
minHeadCount: Number,
currentHeadCount: Number,
currentlyHolding: [Functionary],
historical: [Functionary],
responsibleTo: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Position'
}
});
*note that the Position document can reference itself in the ResponsibleTo field.
Now, I'm trying to build a method that will search the Positions collection, populate the currentlyHolding[].person.name field and the responsibleTo.currentlyHolding[].person.name field, and also return the total number of records found (for paging purposes on the front-end).
Here's what my code looks like:
exports.search = function(req, res) {
var result = {
records: null,
count: 0,
currentPage: req.params.page,
totalPages: 0,
pageSize: 10,
execTime: 0
};
var startTime = new Date();
var populateQuery = [
{
path: 'currentlyHolding.person',
select: 'name'
}, {
path:'responsibleTo',
select:'name currentlyHolding.person'
}
];
Position.find(
{
$or: [
{ name: { $regex: '.*' + req.params.keyword + '.*', $options: 'i' } },
{ description: { $regex: '.*' + req.params.keyword + '.*', $options: 'i' } }
]
},
{},
{
skip: (result.currentPage - 1) * result.pageSize,
limit: result.pageSize,
sort: 'name'
})
.exec()
.populate(populateQuery)
.then(function(doc) {
result.records = doc;
});
Position.count(
{
$or: [
{ name: { $regex: '.*' + req.params.keyword + '.*', $options: 'i' } },
{ description: { $regex: '.*' + req.params.keyword + '.*', $options: 'i' } }
]
})
.exec()
.then(function(doc) {
result.count = doc;
result.totalPages = Math.ceil(result.count / result.pageSize);
})
.then(function() {
var endTime = new Date();
result.execTime = endTime - startTime;
return res.json(200, result);
});
};
My problem is when I run the first query with the populate method (as is shown), it doesn't work. I take away the populate and it works. Is it true that the populate method will break the promise? If so, are there better ways to achieve what I want?

It's been a while since you asked, but this might still help others so here we go:
According to the docs, .populate() doesn't return a promise. For that to happen you should chain .execPopulate().
Alternatively, you can put .populate() before .exec(). The latter will terminate the query builder interface and return a promise for you.