为什么不能将此数据正确解组到我的对象模型中？
我这里有一个（非）工作示例：https ://play.golang.org/p/qaYhKvJ65J3
我不确定为什么会出现以下数据：
alertData := `{
"Id": 0,
"Version": 0,
"OrgId": 1,
"DashboardId": 61,
"PanelId": 84,
"Name": "{qa-dev}{stats-pipeline} Topology Message Age (aggregator) alert",
"Message": "",
"Severity": "",
"State": "",
"Handler": 1,
"Silenced": false,
"ExecutionError": "",
"Frequency": 10,
"EvalData": null,
"NewStateDate": "0001-01-01T00:00:00Z",
"PrevStateDate": "0001-01-01T00:00:00Z",
"StateChanges": 0,
"Created": "0001-01-01T00:00:00Z",
"Updated": "0001-01-01T00:00:00Z",
"Settings": {
"conditions": [
{
"evaluator": {
"params": [
10000
],
"type": "gt"
},
"operator": {
"type": "and"
},
"query": {
"datasourceId": 2,
"model": {
"hide": true,
"refCount": 0,
"refId": "C",
"textEditor": false
},
"params": [
"C",
"5m",
"now"
]
},
"reducer": {
"params": [],
"type": "avg"
},
"type": "query"
}
],
"executionErrorState": "keep_state",
"frequency": "10s",
"handler": 1,
"name": "{qa-dev}{stats-pipeline} Topology Message Age (aggregator) alert",
"noDataState": "keep_state",
"notifications": []
}
}`
我只是得到：json object:::: {Evaluator:{Params:[] Type:} Operator:{Type:} Query:{Params:[]} Reducer:{Params:[] Type:} Type:}
理想情况下，我能够将其解析为类似的东西type Conditions []struct{ }，但我不确定您是否可以将模型定义为列表？
九州编程2回答
-
慕码人8056858
看起来您正在尝试访问嵌套在根“设置”属性下的“条件”属性。因此，您需要定义该根级类型和足够的字段来告诉解组器如何找到您的目标属性。因此，您只需要创建一个带有必要的“设置/条件”字段的新“AlertData”类型。例如：type AlertData struct { Settings struct { Conditions []Condition `json:"conditions"` }}func main() { alert := AlertData{} err := json.Unmarshal([]byte(alertData), &alert) if err != nil { panic(err) } fmt.Printf("OK: conditions=%#v\n", alert.Settings.Conditions) // OK: conditions=[]main.Condition{main.Condition{Evaluator:struct { Params []int "json:\"params\""; Type string "json:\"type\"" }{Params:[]int{10000}, Type:"gt"}, Operator:struct { Type string "json:\"type\"" }{Type:"and"}, Query:struct { Params []string "json:\"params\"" }{Params:[]string{"C", "5m", "now"}}, Reducer:struct { Params []interface {} "json:\"params\""; Type string "json:\"type\"" }{Params:[]interface {}{}, Type:"avg"}, Type:"query"}}}请注意，打印的列表包含如此多的类型信息，因为“条件”类型使用匿名结构作为字段类型。如果您要将它们提取到命名结构中，那么使用数据会更容易，例如：type Condition struct { Evaluator Evaluator `json:"evaluator"` Operator Operator `json:"operator"` // ...}type Evaluator struct { Params []int `json:"params"` Type string `json:"type"`}type Operator struct { Type string `json:"type"`}//...// OK: conditions=[]main.Condition{// main.Condition{// Evaluator:main.Evaluator{Params:[]int{10000}, Type:"gt"},// Operator:main.Operator{Type:"and"},// Query:main.Query{Params:[]string{"C", "5m", "now"}},// Reducer:main.Reducer{Params:[]interface {}{}, Type:"avg"},// Type:"query",// },// } -
HUX布斯
这是一种替代方法，它围绕结构方法进行访问，数据结构也已完全定义。package mainimport ( "encoding/json" "fmt" "log" "time")type Data struct { ID int `json:"Id"` Version int `json:"Version"` OrgID int `json:"OrgId"` DashboardID int `json:"DashboardId"` PanelID int `json:"PanelId"` Name string `json:"Name"` Message string `json:"Message"` Severity string `json:"Severity"` State string `json:"State"` Handler int `json:"Handler"` Silenced bool `json:"Silenced"` ExecutionError string `json:"ExecutionError"` Frequency int `json:"Frequency"` EvalData interface{} `json:"EvalData"` NewStateDate time.Time `json:"NewStateDate"` PrevStateDate time.Time `json:"PrevStateDate"` StateChanges int `json:"StateChanges"` Created time.Time `json:"Created"` Updated time.Time `json:"Updated"` Settings struct { Conditions []Condition `json:"conditions"` ExecutionErrorState string `json:"executionErrorState"` Frequency string `json:"frequency"` Handler int `json:"handler"` Name string `json:"name"` NoDataState string `json:"noDataState"` Notifications []interface{} `json:"notifications"` } `json:"Settings"`}type Condition struct { Evaluator struct { Params []int `json:"params"` Type string `json:"type"` } `json:"evaluator"` Operator struct { Type string `json:"type"` } `json:"operator"` Query struct { DatasourceID int `json:"datasourceId"` Model struct { Hide bool `json:"hide"` RefCount int `json:"refCount"` RefID string `json:"refId"` TextEditor bool `json:"textEditor"` } `json:"model"` Params []string `json:"params"` } `json:"query"` Reducer struct { Params []interface{} `json:"params"` Type string `json:"type"` } `json:"reducer"` Type string `json:"type"`}func (d Data) GetFirstCondition() (Condition, error) { if len(d.Settings.Conditions) > 0 { return d.Settings.Conditions[0], nil } return Condition{}, fmt.Errorf("no conditions found")}func (d Data) GetConditionByIndex(index uint) (Condition, error) { if len(d.Settings.Conditions) == 0 { return Condition{}, fmt.Errorf("no conditions found") } if int(index) > len(d.Settings.Conditions)-1 { return Condition{}, fmt.Errorf("index out of bounds") } return d.Settings.Conditions[index], nil}var alertData = `{ "Id": 0, "Version": 0, "OrgId": 1, "DashboardId": 61, "PanelId": 84, "Name": "{qa-dev}{stats-pipeline} Topology Message Age (aggregator) alert", "Message": "", "Severity": "", "State": "", "Handler": 1, "Silenced": false, "ExecutionError": "", "Frequency": 10, "EvalData": null, "NewStateDate": "0001-01-01T00:00:00Z", "PrevStateDate": "0001-01-01T00:00:00Z", "StateChanges": 0, "Created": "0001-01-01T00:00:00Z", "Updated": "0001-01-01T00:00:00Z", "Settings": { "conditions": [ { "evaluator": { "params": [ 10000 ], "type": "gt" }, "operator": { "type": "and" }, "query": { "datasourceId": 2, "model": { "hide": true, "refCount": 0, "refId": "C", "textEditor": false }, "params": [ "C", "5m", "now" ] }, "reducer": { "params": [], "type": "avg" }, "type": "query" } ], "executionErrorState": "keep_state", "frequency": "10s", "handler": 1, "name": "{qa-dev}{stats-pipeline} Topology Message Age (aggregator) alert", "noDataState": "keep_state", "notifications": [] }}`func main() { var res Data err := json.Unmarshal([]byte(alertData), &res) if err != nil { log.Fatal(err) } fmt.Println(res.GetFirstCondition()) fmt.Println(res.GetConditionByIndex(0)) // should fail :-) fmt.Println(res.GetConditionByIndex(1))}
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