Please,
How can I use a query with Peewee to return a JSON format with Nested objects?
Example:
[
{
"active": 1,
"id": 1,
"name": "Los Angeles",
"idState": 2,
"TBState": {
"id": 2,
"name": "California"
}
}
]
I can it using SqlAlchemy using relationship by model but in Peewee I don't know as make.
Thanks!
Peewee has a helper model_to_dict docs that you can use.
Related
From the contacts, I'd like to select the values in fields: "Id" (47) and everything from the nested array [doNotContact]. I could use some help defining the JSONPath-filter I should be using to select the values: 47 and each value inside the nested array.
{
"total": "1",
"contacts": {
"47": {
"id": 47,
"isPublished": true,
"dateAdded": "2015-07-21T12:27:12-05:00",
"createdBy": 1,
"createdByUser": "Joe Smith",
"doNotContact": [{
"id": 2,
"reason": 2,
"comments": "",
"channel": "email",
"channelId": null
}]
}
}
}
I have tried paths like: $.contacts.*.['id','doNotContact'] however, this does not seem to work. I am using the website: https://goessner.net/articles/JsonPath/ normally this would help me solve the problem.
Not all implementations support the comma-delimited selectors, e.g. ['id','doNotContact']. See the JSON Path comparison project site (specifically this test) for information as to which implementations support the syntax.
Secondly, please see this answer about omitting the dot before a bracket syntax
I have a collection in my MongoDB that contains one field that is an array.
Refer to the data above, the field 'Courses' is an array.
The JSON format of the data is like this:
{
"_id": {
"$oid": "60eb59b98a970a20865142e8"
},
"Name": "Sadia",
"Age": 24,
"Institute": "IBA",
"Courses": [{
"Name": "ITP",
"Grade": "A-"
}, {
"Name": "OOP",
"Grade": "A-"
}]
}
I am aware that there is a way in case its an object, but could not find a way on how to read this data using Talend since it contains an array.
I have a noSql (Cloudant) database
-Within the database we have documents where one of the document fields represents “table” (type of document)
-Within the documents we have fields that represent links other documents within the database
For example:
{_id: 111, table:main, user_id:222, field1:value1, other1_id: 333}
{_id: 222, table:user, first:john, other2_id: 444}
{_id: 333, table:other1, field2:value2}
{_id: 444, table:other2, field3:value3}
We want of way of searching for _id:111
And the result be one document with data from linked tables:
{_id:111, user_id:222, field1:value1, other1_id: 333, first:john, other2_id: 444, field2:value2, field3:value3}
Is there a way to do this?
There is flexibility on the structure of how we store or get the data back—any suggestions on how to better structure the data to make this possible?
The first thing to say is that there are no joins in Cloudant. If you're schema relies on lots of joining then you're working against the grain of Cloudant which may mean extra complication for you or performance hits.
There is a way to de-reference other documents' ids in a MapReduce view. Here's how it works:
create a MapReduce view to emit the main document's body and its linked document's ids in the form { _id: 'linkedid'}
query the view with include_docs=true to pull back the document AND the de-referenced ids in one go
In your case, a map function like this:
function(doc) {
if (doc.table === 'main') {
emit(doc._id, doc);
if (doc.user_id) {
emit(doc._id + ':user', { _id: doc.user_id });
}
}
}
would allow you to pull back the main document and its linked user document in one API by hitting the GET /mydatabase/_design/mydesigndoc/_view/myview?startkey="111"&endkey="111z"&include_docs=true endpoint:
{
"total_rows": 2,
"offset": 0,
"rows": [
{
"id": "111",
"key": "111",
"value": {
"_id": "111",
"_rev": "1-5791203eaa68b4bd1ce930565c7b008e",
"table": "main",
"user_id": "222",
"field1": "value1",
"other1_id": "333"
},
"doc": {
"_id": "111",
"_rev": "1-5791203eaa68b4bd1ce930565c7b008e",
"table": "main",
"user_id": "222",
"field1": "value1",
"other1_id": "333"
}
},
{
"id": "111",
"key": "111:user",
"value": {
"_id": "222"
},
"doc": {
"_id": "222",
"_rev": "1-6a277581235ca01b11dfc0367e1fc8ca",
"table": "user",
"first": "john",
"other2_id": "444"
}
}
]
}
Notice how we get two rows back, the first is the main document body, the second the linked user.
Hi currently I want to sort array of object, I use ARRAY_SORT function, it will use the first field of object to sort & it work well if every object has the same JSON structure. If one element in array has different JSON structure, the result is incorrect.
The query I use :
SELECT ARRAY_SORT(c.student) as student FROM Class c
Result :
"student": [
{
"id": 3,
"name": "Kenny35"
},
{
"id": 6,
"name": "Kenny35"
},
{
"id": 7,
"name": "Kenny35"
},
{
"id": 8,
"name": "Kenny35"
},
{
"hobby": "video game",
"id": 5,
"name": "Kenny35"
}
]
How can I specify property of object in array for ARRAY_SORT function ?
dev,
Objects are first compared by length/size of the object, then followed by fields in the object.
http://developer.couchbase.com/documentation/server/4.5/n1ql/n1ql-language-reference/comparisonops.html
That is the only collation supported now.
-Prasad
You can issue a query and use ORDER BY.
SELECT *
FROM Class c
UNNEST c.student s
ORDER BY ...
I am using mgo.v2 mongodb driver to manupulation data with mongodb.I have data strucure as follow json
"configs": [
{
"configid":1,
"id": 0,
"widgets": [
{
"position": 1,
"type": 1,
"class": "normal green",
"metricid": 5
},
{
"position": 2,
"type": 1,
"class": "normal blue",
"metricid": 6
}
]
}
]
I have created configs collection by using above json structure.
err2 := session.DB("db").C("configs").Insert(&config)
but.In my case, I want add new item to widgets array to this configid. it is kind of object like this,
{
"position": 3,
"type": 1,
"class": "normal red",
"metricid": 7
}
What is the best way to adding this object into widgets array in paticular configid in mongodb? I am using mgo.v2 mongodb driver
You can use the update method to add the array element using the $push operator. For example:
session.DB("db").C("configs").Update(
bson.M{"configid": 1},
bson.M{"$push": bson.M{"widgets": widget}}
)