structs

Go library for encoding native Go structures into generic map values.

Installation

Use go get.

    go get -u github.com/things-go/structs

Then import the structs package into your own code.

    import "github.com/things-go/structs"

Usage && Example

API

Just like the standard lib strings, bytes and co packages, structs has many global functions to manipulate or organize your struct data. Lets define and declare a struct:

type Server struct {
    Name        string `json:"name,omitempty"`
    ID          int
    Enabled     bool
    users       []string // not exported
    http.Server          // embedded
}

server := &Server{
    Name:    "gopher",
    ID:      123456,
    Enabled: true,
}

Here is an example:

// Convert a struct to a map[string]interface{}
// => {"Name":"gopher", "ID":123456, "Enabled":true}
m := structs.Map(server)

// Convert the values of a struct to a []interface{}
// => ["gopher", 123456, true]
v := structs.Values(server)

// Convert the names of a struct to a []string
// (see "Names methods" for more info about fields)
n := structs.Names(server)

// Convert the values of a struct to a []*Field
// (see "Field methods" for more info about fields)
f := structs.Fields(server)

// Return the struct name => "Server"
n := structs.Name(server)

// Check if any field of a struct is initialized or not.
h := structs.HasZero(server)

// Check if all fields of a struct is initialized or not.
z := structs.IsZero(server)

// Check if server is a struct or a pointer to struct
i := structs.IsStruct(server)

Only public fields will be processed. So fields starting with lowercase will be ignored.

Name Tags

type AA struct {
    Id        int64    `map:"id"`
    Name      string   `map:"name"`
}

We can give the field a tag to specify another name to be used as the key.

Ignore Field

type AA struct {
    Ignore string `map:"-"`
}

If we give the special tag "-" to a field, it will be ignored.

Omit Empty

type AA struct {
    Desc        string    `map:"desc,omitempty"`
}

If tag option is "omitempty", this field will not appear in the map if the value is empty. Empty values are 0, false, "", nil, empty array and empty map.

Omit Nested

type AA struct {
    // Field is not processed further by this package.
    Field *http.Request `map:",omitnested"`
}

A value with the option of "omitnested" stops iterating further if the type is a struct. it do not converted value if a value are no exported fields, ie: time.Time

To String

type AA struct {
    Id        int64    `map:"id,string"`
    Price     float32  `map:"price,string"`
}

If tag option is "string", this field will be converted to string type. Encode will put the original value to the map if the conversion is failed.

References

• mapstructure
• structs

License

This project is under MIT License. See the LICENSE file for the full license text.