Using reduce() to construct a JSON.
Send data in JSON body with http.post()
Use the reduce() function to create a JSON object to include as the body with http.post().
-
Import both the array package to query data and construct table(s), and the http package to transfer JSON over http.
-
Use
array.from()to query data and construct a table. Or, use another method to query data with Flux. -
Use the
reduce()function to construct a JSON object, and then useyield()to store the output of reduce. This table looks like:field tag example-field:[“3"4"1 {example-tag-key:[“bar"bar"bar -
Use the map() function to combine the two components together into a JSON object, and then use a second
yield()function to store this object asfinal JSON. This table looks like:field tag final example-field:[“3"4"1 {example-tag-key:[“bar"bar"bar {example-tag-key:[“bar"bar"bar] , example-field:[“3"4"1]} -
Use the
findRecord()function to extract the value from the final column, the JSON. -
Use
http.post()to specify a URL to sent the JSON to. In this example, we use Post Test Server as URL to send the JSON to, and test thehttp.post()function.
import "array"
import "http"
data = array.from(
rows: [
{_time: 2020-01-01T00:00:00Z, _field: "example-field", _value: 3, foo: "bar"},
{_time: 2020-01-01T00:01:00Z, _field: "example-field", _value: 4, foo: "bar"},
{_time: 2020-01-01T00:02:00Z, _field: "example-field", _value: 1, foo: "bar"},
],
)
|> reduce(
fn: (r, accumulator) => ({tag:accumulator.tag + "\"" + r.foo,
field : accumulator.field + "\"" + string(v:r._value)
}),
identity: {tag: "{example-tag-key:[",
field: "example-field:[" }
)
|> yield(name: "output of reduce")
|> map(fn: (r) => ({ r with tag: r.tag + "]" }))
|> map(fn: (r) => ({ r with field: r.field + "]}" }))
|> map(fn: (r) => ({ r with final: r.tag + " , " + r.field}))
|> yield(name: "final JSON")
|> findRecord(
fn: (key) => true,
idx: 0,
)
http.post(
url: "https://ptsv2.com/t/c4x38-1656014222/post",
headers: {"Content-type": "application/json"},
data: bytes(v: data.final),
)
Was this page helpful?
Thank you for your feedback!
Support and feedback
Thank you for being part of our community! We welcome and encourage your feedback and bug reports for and this documentation. To find support, use the following resources:
Customers with an annual or support contract can contact InfluxData Support.