structdiff's Introduction

Description

Comparing the two structures, the output differs according to the syntax definition format of gjson

Example

package modeldiff

import (
    "encoding/json"
    "log"
    "testing"
)

type Student struct {
    Name      string
    Subjects1 []*Subject `comparedby:"Name"`
    Subjects2 []*Subject

    Contacts1 Contacts `comparedby:",direct"`
    Contacts2 Contacts
}

type Subject struct {
    Name  string
    Score float64
}

type Contacts struct {
    Phone string
}

func TestCompare(t *testing.T) {
    diffdetails := &DiffDetails{}

    oldStudent := &Student{
        Name:      "LiLei",
        Subjects1: []*Subject{{Name: "Math", Score: 80}, {Name: "Geography", Score: 80}},
        Subjects2: []*Subject{{Name: "Math", Score: 80}, {Name: "Geography", Score: 80}},
        Contacts1: Contacts{Phone: "12345678"},
        Contacts2: Contacts{Phone: "12345678"},
    }

    newStudent := &Student{
        Name:      "LiLei",
        Subjects1: []*Subject{{Name: "Math", Score: 88}, {Name: "English", Score: 88}},
        Subjects2: []*Subject{{Name: "Math", Score: 88}, {Name: "English", Score: 88}},
        Contacts1: Contacts{Phone: "123456"},
        Contacts2: Contacts{Phone: "123456"},
    }

    diffdetails, err := Diff(newStudent, oldStudent)
    if err != nil {
        panic(err)
    }
    body, _ := json.Marshal(diffdetails)
    log.Println(string(body))
}

 {
    "Add": {
        "Subjects1.#(Name=="English")": null
    },
    "Del": {
        "Subjects1.#(Name=="Geography")": {
            "Score": 80,
            "Name": "Geography"
        }
    },
    "Change": {
        "Subjects2": [
            {
                "Score": 80,
                "Name": "Math"
            },
            {
                "Score": 80,
                "Name": "Geography"
            }
        ],
        "Subjects1.#(Name=="Math").Score": 80,
        "Contacts2.Phone": "12345678",
        "Contacts1": {
            "Phone": "12345678"
        }
    }
}

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