How to access nested structure elements
php editor Xigua will introduce how to access nested structural elements. In programming, nested structures are often used to represent complex data structures, such as multi-level arrays or objects. To access elements in a nested structure we need to use appropriate syntax and methods. This article will explain in detail how to access and obtain elements in the nested structure step by step according to the level, helping readers better understand and process nested structure data. Whether you are a beginner or an experienced developer, this article will provide you with practical tips and examples to help you easily deal with the need to access nested structural elements.
Question content
I have such a structure. I want to parse my json into this structure. But I can't access the nested structure.
I would like to be able to achieve a similar substructure, but I can't:
func main() { str := `[{ "applicationdefaults": { "applicationpoolname": "defaultapppool", .... }]` mdl := foo(str) // mdl.applicationdefaults ?? i can't reach like this. there are only a few functions like: append!, last! , print!, range!, reverse!, sort!, var! }
Can anyone help?
My structure:
package model type sitesdetails []struct { applicationdefaults struct { applicationpoolname string `json:"applicationpoolname"` enabledprotocols string `json:"enabledprotocols"` attributes string `json:"attributes"` childelements string `json:"childelements"` elementtagname string `json:"elementtagname"` islocallystored bool `json:"islocallystored"` methods interface{} `json:"methods"` rawattributes string `json:"rawattributes"` schema string `json:"schema"` } `json:"applicationdefaults"` applications []string `json:"applications"` bindings []string `json:"bindings"` id int `json:"id"` limits struct { connectiontimeout string `json:"connectiontimeout"` maxbandwidth int64 `json:"maxbandwidth"` maxconnections int64 `json:"maxconnections"` maxurlsegments int `json:"maxurlsegments"` attributes string `json:"attributes"` childelements string `json:"childelements"` elementtagname string `json:"elementtagname"` islocallystored bool `json:"islocallystored"` methods interface{} `json:"methods"` rawattributes string `json:"rawattributes"` schema string `json:"schema"` } `json:"limits"` }
This is the code I use to parse json into a structure:
func foo(resp string) model.SitesDetails { data := []byte(resp) var m model.SitesDetails err := json.Unmarshal(data, &m) if err != nil { log.Fatal(err) } return m }
Workaround
You are unmarshaling to a slice here (because your sitesdetails
type is []struct
and your json starts with an array), so you should be able to access your details via
poolName := model[0].ApplicationDefaults.ApplicationPoolName
This also explains why your IDE only suggests operations that can be applied to slices, such as append (I guess this inserts the correct code to append to your slice).
BTW, you really shouldn't call your variable model
, since that's also the name you're apparently using for your package (you're using model.sitesdetails
) , so your variable names will hide the package at this point - this can lead to huge confusion, and any decent IDE should warn you about this.
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