json

How to use generics and list of generics with json serialization in Dart?

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json_serializable json_serializable has a several strategies1 to handle generic types as single objects T or List<T> (as of v. 5.0.2+) : Helper Class: JsonConverter Helper Methods: @JsonKey(fromJson:, toJson:) Generic Argument Factories @JsonSerializable(genericArgumentFactories: true) 1 Of which I’m aware. There’s likely other ways to do this. Helper Class: JsonConverter Basic idea: write a custom JsonConverter class … Read more

Writing JSON column to Postgres using Pandas .to_sql

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I’ve been searching the web for a solution but couldn’t find any so here is what we came up with (there might be better ways but at least this is a start if someone else runs into this). Specify the dtype parameter in to_sql. We went from:df.to_sql(table_name, analytics_db) to df.to_sql(table_name, analytics_db, dtype={‘name_of_json_column_in_source_table’: sqlalchemy.types.JSON}) and it … Read more

How to change tab width when converting to JSON in Powershell

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Because the PowerShell’s ConvertTo-Json produces non-deterministic indentation, the current answers will not produce JSON that has exactly two spaces for each depth in the data structure. To get each level of nested data indented exactly two spaces more than the enclosing level requires rebuilding the indentation. (For what it’s worth, looks like this was fixed … Read more

Filter by Regex in JQ

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If you tacked the following filter onto the one you already have, then you’d get the output shown below: map(select(.Address | test(“^[0-9]”))) Output: [ { “Address”: “1 Bridge Rd” } ] For robustness, you might like to consider adding ? after the test: map(select(.Address | test(“^[0-9]”)?)) Or, you could combine the two calls to map … Read more

(un)marshalling json golang not working

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For example, package main import “fmt” import “encoding/json” type testStruct struct { Clip string `json:”clip”` } func main() { //unmarshal test var testJson = “{\”clip\”:\”test\”}” var t testStruct var jsonData = []byte(testJson) err := json.Unmarshal(jsonData, &t) if err != nil { fmt.Printf(“There was an error decoding the json. err = %s”, err) return } fmt.Printf(“contents … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)