Does anyone know how to user jsonata to group by multiple fields and count ?
https://docs.jsonata.org/
I can't figure it out, I have been using the jsonata online playground but I can't seem to get anywhere.
I have an array of objects and I want to group by multiple fields and count
I have been doing this earlier in mysql and it is very simple but now when the "records" are json objects I am bit lost and need help
The result should be a new array with the grouped fields + count of the grouped fields
Thanks,
Jani
It is a bit hacky solution, but I think it does what you want:
$${
API_TYPE & API_VERSION & METHOD_NAME: {
"API_TYPE": [API_TYPE][0],
"API_VERSION": [API_VERSION][0],
"METHOD_NAME": [METHOD_NAME][0],
"COUNT": $count($)
}
} ~> $each(function($value) {$value})
The trick is to use the grouping feature, and group by all three parameters by concatenating them to a single string.
See it in action: https://stedi.link/L1a9Tiv
Related
So I'm doing some tests with GraphQL, and I'm failing in doing something that I believe is fairly simple.
When going to the GraphQL demo site (https://graphql.org/swapi-graphql) I'm presented with a default query which goes like this:
{
allFilms {
films {
title,
director,
releaseDate
}
}
}
This works as expected and returns a list of films.
Now - I would like to modify this query to return only the films where the director is George Lucas, and for the life of me - I can't figure out how to do that.
I've tried using the where and filter expressions, and also change the second line to films: (director: "George Lucas") but keep getting error messages.
What's the correct syntax for doing that?
Thanks!
If you check the docs of the provided GraphQL schema, you'll see that this is not possible. Following is the definition of the allFilms field:
allFilms(
after: String
first: Int
before: String
last: Int
): FilmsConnection
As per the doc, it has 4 input arguments, which are after, first, before, and last. There is no way to filter this out using the director's name.
GraphQL is not SQL. You cannot use expressions like WHERE or FILTER in GraphQL. The schema is already defined and the filters are pre-defined too. If the schema does not allow you to filter values using a certain field, you just can't do it.
You can to see the graphql schema here https://github.com/graphql/swapi-graphql/blob/master/schema.graphql
The allFilms query does not contain a filter for the field director. Also i can't find other query with this filter.
Most likely you need to write a filter on the result of the query.
A field with name 'Field' is checked against multiple values, right now am doing something as shown below:
ARRAY_CONTAINS(Field, "Value1")) OR
ARRAY_CONTAINS(Field, "Value2")) OR
ARRAY_CONTAINS(Field, "Value3"))
Instead is there a Linq query equivalent to just do something like Field.Contains("Value1", "Value2", "Value3"). If one exists, how is it written as Linq expression. Thanks!
You could use Enumerable.Intersect for the purpose.
if(sourceArray.Intersect(elementsToSearch).Any())
{
}
Where elementsToSearch to search are collection of values you want to compare against.
Using the following query:
r.db('somedb').table('sometable')('users')
I get the following data from the result:
[
[
{
"fn": "dpw",
"u": "usertwo"
},
{
"fn": "dwd",
"u": "userone"
}
]
]
I would like to take the field "u" and specify lets say "usertwo" and get the value of "fn" for that "u". I want to have the result filtered using ReQL so that I am not just parsing the json result in nodejs as the result will be enormous eventually. What would be the best and most efficient approach. I am new to RethinkDB and would appreciate if you could explain the answer as best you can.
I'm not sure of what you exactly want, but from my understanding, this is what you are looking for:
r.db('somedb').table('sometable')('users').filter(function(user) {
return user("u").eq("usertwo")
})("fn")
You seem to have an array of array of users. if that was not a typo, the query should probably be
r.db('somedb').table('sometable')('users').nth(0).filter(function(user) {
return user("u").eq("usertwo")
})("fn")
I'm building a advanced search functionality and, thanks to the help of some ruby fellows on SO, I've been already able to combine AND and OR conditions programmatically on different fields of the same class.
I ended up writing something similar to the accepted answer mentioned above, which I report here:
query = criteria.each_with_object({}) do |(field, values), query|
field = field.in if(values.is_a?(Array))
query[field] = values
end
MyClass.where(query)
Now, what might happen is that someone wants to search on a certain field with multiple criteria, something like:
"all the users where names contains 'abc' but not contains 'def'"
How would you write the query above?
Please note that I already have the regexes to do what I want to (see below), my question is mainly on how to combine them together.
#contains
Regex.new('.*' + val + '.*')
#not contains
Regex.new('^((?!'+ val +').)*$')
Thanks for your time!
* UPDATE *
I was playing with the console and this is working:
MyClass.where(name: /.*abc.*/).and(name: /^((?!def).)*$/)
My question remains: how do I do that programmatically? I shouldn't end up with more than two conditions on the same field but it's something I can't be sure of.
You could use an :$and operator to combine the individual queries:
MyClass.where(:$and => [
{ name: /.*abc.*/ },
{ name: /^((?!def).)*$/ }
])
That would change the overall query builder to something like this:
components = criteria.map do |field, value|
field = field.in if(value.is_a?(Array))
{ field => value }
end
query = components.length > 1 ? { :$and => components } : components.first
You build a list of the individual components and then, at the end, either combine them with :$and or, if there aren't enough components for :$and, just unwrap the single component and call that your query.
I have a simple document named Order structure with the fields id, name,
userId and timeScheduled.
What I would like to do is create a view where I can find the
document.id for those who's userId is some value and timeScheduledis
after a given date.
My view:
"by_users_after_time": {
"map": "function(doc) { if (doc.userId && doc.timeScheduled) {
emit([doc.timeScheduled, doc.userId], doc._id); }}"
}
If I do
localhost:5984/orders/_design/Order/_view/by_users_after_time?startKey="[2012-01-01T11:40:52.280Z,f98ba9a518650a6c15c566fc6f00c157]"
I get every result back. Is there a way to access key[1] to do an if
doc.userId == key[1] or something along those lines and simply emit on the
time?
This would be the SQL equivalent of
select id from Order where userId =
"f98ba9a518650a6c15c566fc6f00c157" and timeScheduled >
2012-01-01T11:40:52.280Z;
I did quite a few Google searches but I can't seem to find a good tutorial
on working with multiple keys. It's also possible that my approach is
entirely flawed so any guidance would be appreciated.
You only need to reverse the key, because username is known:
function (doc) {
if (doc.userId && doc.timeScheduled) {
emit([doc.userId, doc.timeScheduled], 1);
}
}
Then query with:
?startkey=["f98ba9a518650a6c15c566fc6f00c157","2012-01-01T11:40:52.280Z"]
NOTES:
the query parameter is startkey, not startKey;
the value of startkey is an array, not a string. Then the double quotes go around the username and date values, not around the array.
I emit 1 as value, instead of doc._id, to save disk-space. Every row of the result has an id field with the doc._id, then there's no need to repeat it.
don't forget to set an endkey=["f98ba9a518650a6c15c566fc6f00c157",{}], otherwise you get the data of all users > "f98ba9a518650a6c15c566fc6f00c157"
The answer actually came from the couchdb mailing list:
Essentially, the Date.parse() doesn't like the +0000 on the timestamps. By
doing a substring and removing the +0000, everything worked.
For the record,
document.write(new Date("2012-02-13T16:18:19.565+0000")); //Outputs Invalid
Date
document.write(Date.parse("2012-02-13T16:18:19.565+0000")); //Outputs NaN
But if you remove the +0000, both lines of code work perfectly.