Map json to structure with nested dictionaries
php Editor Strawberry Mapping json into a structure with nested dictionaries is a common data processing method. By converting json data into a nested dictionary, we can operate and access the data more conveniently. The structure of nested dictionaries can provide a more flexible way of organizing data, allowing us to process complex data structures more efficiently. In practical applications, mapping json to nested dictionaries can help us better understand and process data, and improve code readability and maintainability. Whether processing json data returned by APIs or parsing configuration files, mapping json to nested dictionaries is a common data processing technique.
Question content
I am new to golang. I have a json file with a nested structure that I want to parse and populate.
I'm trying to use a map structure to try to populate. I was able to do this with simple structures. But when it comes to dictionary array(key: struct). map[string]interface{}
appears to fail with a runtime error: Index out of range
.
I tried to do the following with the json example below.
type window struct { loc []int wrtc string label string } type view struct { windows []window } type views struct { views []view } type desktop struct { views []views `mapstructure:views` rotation_speed string `mapstructure:"rotationspeed" json:rotationspeed"` } func main() { file, _ := ioutil.readfile("test.json") data := desktop{} _ = json.unmarshal([]byte(file), &data) fmt.println("data: ", data.views[0]) }
{ "desktop": { "view": [{// configs for view1 "random_id1": { "loc": [0,0,640,360], "wrtc": "some string", "label": "window 1" }, "random_id213443": { "loc": [640,360,1280,720], "wrtc": "some string blah", "label": "window 2" }, // more windows with random ids.... }, { // configs for view2... } ], "rotationSpeed": 30 }
Since the window id is random, I can't define it in the structure.
I tried using mapstruct:",squash"
but that also seems to fail.
Thank you very much for any help you can provide.
Solution
@burak serdar is right
You don't need a map structure. json unmarshalling can solve this problem.
There are many errors in your code, such as structure, capitalization, "views", etc.
The following is a demonstration:
package main import ( "encoding/json" "fmt" ) var data = ` { "desktop":{ "view":[ { "random_id1_1":{ "loc":[ 0, 0, 640, 360 ], "wrtc":"some string", "label":"window 1" }, "random_id1_2":{ "loc":[ 640, 360, 1280, 720 ], "wrtc":"some string blah", "label":"window 2" } }, { "random_id2_1":{ "loc":[ 0, 0, 640, 360 ], "wrtc":"some string", "label":"window 1" }, "random_id2_2":{ "loc":[ 640, 360, 1280, 720 ], "wrtc":"some string blah", "label":"window 2" } } ], "rotationspeed":30 } } ` type window struct { loc []int wrtc string label string } type desktop struct { view []map[string]window rotation_speed int `json:"rotationspeed" mapstructure:"rotationspeed"` } type config struct { desktop desktop } func main() { c := config{} json.unmarshal([]byte(data), &c) fmt.println("json.unmarshal: ", c) }
json.unmarshal: {{[map[random_id1_1:{[0 0 640 360] some string window 1} random_id1_2:{[640 360 1280 720] some s tring blah window 2}] map[random_id2_1:{[0 0 640 360] some string window 1} random_id2_2:{[640 360 1280 720] some string blah window 2}]] 30}}
If you want the view
structure, you can also use mapstruct
type Window struct { Loc []int Wrtc string Label string } type View struct { Windows map[string]Window `mapstructure:",remain"` } type Desktop struct { View []View Rotation_speed int `json:"rotationSpeed" mapstructure:"rotationSpeed"` } type Config struct { Desktop Desktop } func main() { c2 := Config{} m := map[string]interface{}{} _ = json.Unmarshal([]byte(data), &m) mapstructure.Decode(m, &c2) fmt.Println("mapstructure: ", c2) }
The above is the detailed content of Map json to structure with nested dictionaries. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



The restrict keyword is used to inform the compiler that a variable can only be accessed by a pointer, preventing undefined behavior, optimizing code and improving readability: Preventing undefined behavior when multiple pointers point to the same variable. To optimize code, the compiler uses the restrict keyword to optimize variable access. Improves code readability by indicating that variables can only be accessed by a pointer.

Templated programming improves code quality because it: Enhances readability: Encapsulates repetitive code, making it easier to understand. Improved maintainability: Just change the template to accommodate data type changes. Optimization efficiency: The compiler generates optimized code for specific data types. Promote code reuse: Create common algorithms and data structures that can be reused.

Answer: ORM (Object Relational Mapping) and DAL (Database Abstraction Layer) improve code readability by abstracting the underlying database implementation details. Detailed description: ORM uses an object-oriented approach to interact with the database, bringing the code closer to the application logic. DAL provides a common interface that is independent of database vendors, simplifying interaction with different databases. Using ORM and DAL can reduce the use of SQL statements and make the code more concise. In practical cases, ORM and DAL can simplify the query of product information and improve code readability.

C++ function naming principles require that function names accurately describe function behavior, be concise and clear, use verb forms, avoid underscores, do not use keywords, and can contain parameter and return value information. Following these principles improves the readability and maintainability of your code.

The new features of PHP functions greatly simplify the development process, including: Arrow function: Provides concise anonymous function syntax to reduce code redundancy. Property type declaration: Specify types for class properties, enhance code readability and reliability, and automatically perform type checking at runtime. null operator: concisely checks and handles null values, can be used to handle optional parameters.

The sum keyword does not exist in C language, it is a normal identifier and can be used as a variable or function name. But to avoid misunderstandings, it is recommended to avoid using it for identifiers of mathematical-related codes. More descriptive names such as array_sum or calculate_sum can be used to improve code readability.

Yes, H5 page production is an important implementation method for front-end development, involving core technologies such as HTML, CSS and JavaScript. Developers build dynamic and powerful H5 pages by cleverly combining these technologies, such as using the <canvas> tag to draw graphics or using JavaScript to control interaction behavior.

The C language function name definition includes: return value type, function name, parameter list and function body. Function names should be clear, concise and unified in style to avoid conflicts with keywords. Function names have scopes and can be used after declaration. Function pointers allow functions to be passed or assigned as arguments. Common errors include naming conflicts, mismatch of parameter types, and undeclared functions. Performance optimization focuses on function design and implementation, while clear and easy-to-read code is crucial.
