I have the following document,
{
"VehicleDetailId": 1,
"VehicleDetail": [
{
"Id": 1,
"Make": "BMW"
},
{
"Id": 1,
"Model": "ABDS"
},
{
"Id": 1,
"Trim": "5.6L/ASMD"
},
{
"Id": 1,
"Year": 2008
}
]
}
I want to give aliases for the array elements, something like this,
{
"VehicleDetailId": 1,
"Type": "VehicleDetail",
"VehicleDetail": [
{
"MakeId": 1,
"MakeValue": "BMW"
},
{
"ModelId": 1,
"ModelValue": "ABDS"
},
{
"TrimId": 1,
"TrimValue": "5.6L/ASMD"
},
{
"YearId": 1,
"YearValue": 2008
}
]
}
The following query seems to work fine, but since Id is common for all, it is repeating every time.
SELECT c.vehicleDetailId, ARRAY(SELECT v.Id AS MakeId, v.Make AS MakeValue,
v.Id AS ModelId, v.Model AS ModelValue,
v.Id AS TrimId, v.Trim AS TrimValue,
v.Id AS YearId, v.Year AS YearValue
FROM v IN c.VehicleDetail) AS VehicleDetail
FROM c
How should I write the query so that the Id does not repeat every time, and I can fetch an element from a specific position?
You could use UDF to implement your needs.
Udf code:
function userDefinedFunction(array){
var returnArray = [];
for(var i=0;i<array.length;i++){
var obj = array[i];
var map = {};
if(obj.Make){
map["MakeId"]= obj.Id;
map["MakeValue"]= obj.Make;
}else if(obj.Model){
map["ModelId"]= obj.Id;
map["ModelValue"]= obj.Model;
}else if(obj.Trim){
map["TrimId"]= obj.Id;
map["TrimValue"]= obj.Trim;
}else if(obj.Year){
map["YearId"]= obj.Id;
map["YearValue"]= obj.Year;
}
returnArray.push(map);
}
return returnArray;
}
Sql:
SELECT c.VehicleDetailId,udf.test(c.VehicleDetail) AS VehicleDetail
FROM c
Output:
Related
I have a tree object like below:
let data = [
{
id: 1,
children: [
{
id: 1.1,
children: [
{
id: 1.2,
children: []
},
{
id: 1.22,
children: []
}
]
}
]
},
{
id: 2,
children: []
}
]
I want to filter out id equal a specific value. In this case, I want to filter out id equal 1.2.
The rusult I want is like below:
let data = [
{
id: 1,
children: [
{
id: 1.1,
children: [
{
id: 1.22,
children: []
}
]
}
]
},
{
id: 2,
children: []
}
]
I have search a few question about filter nest deep object, But still don't know how. I need to use recursion to solve this.
This is my way:
function handleDelete (data) {
return data.filter(t => {
if (t.children.length) {
handleDelete(t.children)
})
} else {
return t.id !== '1.2'
}
})
}
let result = handleDelete(data)
delete a node and its descendants
Here's an effective technique using flatMap and mutual recursion1 -
del accepts an array of nodes, t, a query, q, and calls del1 on each node with the query
del1 accepts a single node, t, a query, q, and calls del on a node's children
const del = (t, q) =>
t.flatMap(v => del1(v, q)) // <-- 1
const del1 = (t, q) =>
q == t.id
? []
: { ...t, children: del(t.children, q) } // <-- 2
const data =
[{id:1,children:[{id:1.1,children:[{id:1.2,children:[]},{id:1.22,children:[]}]}]},{id:2,children:[]}]
const result =
del(data, "1.2")
console.log(result)
In the output, we see node.id 1.2 is removed -
[
{
"id": 1,
"children": [
{
"id": 1.1,
"children": [
{
"id": 1.22,
"children": []
}
]
}
]
},
{
"id": 2,
"children": []
}
]
preserving the descendants
In the program above, if a node.id matches our query, the node and all of its descendent children are removed. If we only want to delete the parent node and keep the children, we can make a single modification (!) to the program -
const del = (t, q) =>
t.flatMap(v => del1(v, q))
const del1 = (t, q) =>
q == t.id
? del(t.children, q) // <-- !
: { ...t, children: del(t.children, q) }
const data =
[{id:1,children:[{id:1.1,children:[{id:1.2,children:[]},{id:1.22,children:[]}]}]},{id:2,children:[]}]
const result =
del(data, "1") // <-- delete node.id equal to "1"
console.log(result)
Notice how the children for 1 are still included in the output -
[
{
"id": 1.1,
"children": [
{
"id": 1.2,
"children": []
},
{
"id": 1.22,
"children": []
}
]
},
{
"id": 2,
"children": []
}
]
without mutual recursion
Mutual recursion isn't the only way to do it, but it's the only way to avoid a dynamic type check, such as the one below. In this final revision, we remove a parent and all of its children, as we did in the first program, but this del is implemented using a single recursive function -
const del = (t, q) =>
Array.isArray(t) // <-- array
? t.flatMap(v => del(v, q))
: Object(t) === t // <-- object
? q == t.id
? []
: { ...t, children: del(t.children, q) }
: t // <-- neither (noop)
const data =
[{id:1,children:[{id:1.1,children:[{id:1.2,children:[]},{id:1.22,children:[]}]}]},{id:2,children:[]}]
const result =
del(data, "1.2")
console.log(result)
The output is the same as the first program, where 1.2 and all descendants are removed -
[
{
"id": 1,
"children": [
{
"id": 1.1,
"children": [
{
"id": 1.22,
"children": []
}
]
}
]
},
{
"id": 2,
"children": []
}
]
1. See this technique used on a different data set in this related Q&A.
2. All programs in this answer produce a new tree. The original input is not modified by del (or del1).
I am trying to convert a data.frame into JSON text. How can I include an array in this data.frame? I.e. the variable characteristics needs to contain multiple elements. I do not succeed in this.
Here is my code:
data <- data.frame(sequenceNbr = c(1:3),
requestTypeCode = "MR001",
managementStartingDate = format(Sys.Date(),"%Y-%m-%d"),
TopicCode = "TH02",
Nbr = c("1760448", "6580364", "1391363"),
TypeCode = "R003008",
char1 = "CK001001", char2 = "CK001002",
stringsAsFactors = FALSE) %>%
group_by(sequenceNbr) %>%
nest( Assignment=c(TopicCode),
entity = c(Nbr),
ToControl = c(TypeCode),
characteristics = c(char1,char2)
)
data <- data %>%
mutate( Assignment = purrr::map(Assignment, as.list),
entity = purrr::map(entity, as.list))
json <- jsonlite::toJSON(list(`DefList`=data),
auto_unbox = TRUE, pretty = TRUE)
This gives as output
{
"DefList": [
{
"sequenceNbr": 1,
"requestTypeCode": "MR001",
"managementStartingDate": "2020-06-16",
"Assignment": {
"TopicCode": "TH02"
},
"entity": {
"Nbr": "1760448"
},
"ToControl": [
{
"TypeCode": "R003008"
}
],
"characteristics": [
{
"char1": "CK001001",
"char2": "CK001002"
}
]
},
{
"sequenceNbr": 2,
"requestTypeCode": "MR001",
"managementStartingDate": "2020-06-16",
"Assignment": {
"TopicCode": "TH02"
},
"entity": {
"Nbr": "6580364"
},
"ToControl": [
{
"TypeCode": "R003008"
}
],
"characteristics": [
{
"char1": "CK001001",
"char2": "CK001002"
}
]
}
]
}
What I want as output is this (there is a difference in the characteristics-element):
{
"DefList": [
{
"sequenceNbr": 1,
"requestTypeCode": "MR001",
"managementStartingDate": "2020-06-16",
"Assignment": {
"TopicCode": "TH02"
},
"entity": {
"Nbr": "1760448"
},
"ToControl": [
{
"TypeCode": "R003008"
}
],
"characteristics": [
"CK001001",
"CK001002"
]
},
{
"sequenceNbr": 2,
"requestTypeCode": "MR001",
"managementStartingDate": "2020-06-16",
"Assignment": {
"TopicCode": "TH02"
},
"entity": {
"Nbr": "6580364"
},
"ToControl": [
{
"TypeCode": "R003008"
}
],
"characteristics": [
"CK001001",
"CK001002"
]
}
]
}
It should also work when characteristics contains only one value. Any idea's? I think the data.frame structure is the limiting factor, since it cannot contain an array. I see in this post : https://blog.exploratory.io/working-with-json-data-in-very-simple-way-ad7ebcc0bb89 that it is correct JSON syntax, but I do not manage to obtain it. Thanks in advance for your help.
Suppose I have a document with the following structure,
{
"VehicleDetailId": 1,
"VehicleDetail": [
{
"Id": 1,
"Make": "BMW"
},
{
"Id": 1,
"Model": "ABDS"
},
{
"Id": 1,
"Trim": "5.6L/ASMD"
},
{
"Id": 1,
"Year": 2008
}
]
}
Now I want to retrieve an array element located at a specific position from VehicleDetail array like I want to retrieve the second element, i.e.,
{
"Id": 1,
"Model": "ABDS"
}
or the third,
{
"Id": 1,
"Trim": "5.6L/ASMD"
}
How should I write the query to achieve this?
Use the built-in ARRAY_SLICE function. This allows you to select part of an array.
Pass the array, starting position, number of elements to select.
SELECT ARRAY_SLICE(c.VehicleDetail, 1, 1) As SecondElement
FROM c
Output:
{
"SecondElement": [
{
"Id": 1,
"Model": "ABDS"
}
]
}
clients is an array inside my doc, the following query
SELECT
f.id, f.clients
FROM f
where f.id ="35fb0733-dfa1-4932-9690-3ee5b05d89ff"
Returns
[
"id": "35fb0733-dfa1-4932-9690-3ee5b05d89ff",
{
"clients": [
{
"firstname": "Benjamin",
"surname": "Bob",
},
{
"firstname": "Rachael",
"surname": "Smith",
}
]
}
]
But I would like clients to look like :
"firstnames": [ "Benjamin", "Rachael" ]
"surnames": [ "Bob", "Smith" ]
Is this possible?
You could use the ARRAY expression w/ a subquery to achieve that.
Try this query:
SELECT
ARRAY(SELECT VALUE client.firstname FROM client IN f.clients) AS firstnames,
ARRAY(SELECT VALUE client.surname FROM client IN f.clients) AS surnames
FROM f
Just give an additional option, you could use stored procedure to get the results you want.
function sample() {
var collection = getContext().getCollection();
var isAccepted = collection.queryDocuments(
collection.getSelfLink(),
'SELECT f.id, c.firstname,c.surname FROM f join c in f.clients where f.id ="1"',
function (err, feed, options) {
if (err) throw err;
var map = {};
var firstname = [];
var surname =[];
if (!feed || !feed.length) {
var response = getContext().getResponse();
response.setBody('no docs found');
}
else {
for(var i=0;i<feed.length;i++){
map["id"] = feed[i].id;
firstname.push(feed[i].firstname);
surname.push(feed[i].surname);
}
map["firstname"] = firstname;
map["surname"] =surname;
var response = getContext().getResponse();
response.setBody(map);
}
});
if (!isAccepted) throw new Error('The query was not accepted by the server.');
}
Test Output:
{
"id": "1",
"firstname": [
"Benjamin",
"Rachael"
],
"surname": [
"Bob",
"Smith"
]
}
var productDB = new Meteor.Collection('products'); //Want to insert into this DB
var ProductParameters = nodeDB.find({"ACTIVE" : 1, "VARIENTS.ACCESS" : "PUBLIC"}, { "VARIENTS.NAME": 1, _id : 0 } ); //Taking Paramters from Another DB
Template.dpVar.events = {
'click .addProduct' : function (e) {
e.preventDefault();
ProductParameters.forEach(function(){ **//This is my Question.How to insert into productDB the key values as {ProductParameters: Val of ProductParameters}**
console.log(ProductParameters);
var pvariable = {
pvariable: tmpl.find("#ProductParameters").value
};
productDB.insert(pvariable);
});
}
};
Problem:
I have created form from the Parameters of nodeDB.
I want to store the data from this new form in a new DB productDB.
I want to run a loop where all the ProductParameters are read from nodeDB and their corresponding values inserted in form by user are pushed into ProductDB as new Entry.
EDIT:
NodeDB has Templates:
db.nodes.insert([
{
"GEOLOCATION": {
"GEO_CODE": [],
"ACTIVE_GEOLOCATION": false
},
"META": {
"CATEGORY": "levis",
"DESCRIPTION": "dsad",
"PRIVACY": "PUBLIC",
"TEMPLATE_NAME": "B",
"TEMPLATE_GROUP": "Product",
"KEYWORDS": [
"sda"
],
"CREATEDBY": "",
"SUBCATEGORY": "Blue",
"PRODUCT_TEMPLATE_TYPE": "Consumable",
"UOM": "",
"TEMPLATE_SUBGROUP": ""
},
"VARIENTS": [
{
"COMMENT": "Demo",
"INDEX": 0,
"NAME": "Brand",
"IS_PARENT": false,
"DATATYPE": "Text",
"ACCESS": "PUBLIC",
"PARENT_VARIENT": "Parem",
"TYPE": "PERMANENT"
}
]
}
])
The form is generated only from the VARIENTS
The ProductDB would be {key,value} ={VARIENTS.NAME,value from UI}
There can be multiple VARIENTS as this contains only one "Brand"
instead of
var ProductParameters = nodeDB.find({"ACTIVE" : 1, "VARIENTS.ACCESS" : "PUBLIC"}, { "VARIENTS.NAME": 1, _id : 0 } );
add .fetch() at the end
var ProductParameters = nodeDB.find({"ACTIVE" : 1, "VARIENTS.ACCESS" : "PUBLIC"}, { "VARIENTS.NAME": 1, _id : 0 } ).fetch();