summaryrefslogtreecommitdiffstats
path: root/vendor/github.com/mitchellh/mapstructure/mapstructure_examples_test.go
blob: f17c214a8a95cb2089b8fbcdc85411c0d5ebecb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
package mapstructure

import (
	"fmt"
)

func ExampleDecode() {
	type Person struct {
		Name   string
		Age    int
		Emails []string
		Extra  map[string]string
	}

	// This input can come from anywhere, but typically comes from
	// something like decoding JSON where we're not quite sure of the
	// struct initially.
	input := map[string]interface{}{
		"name":   "Mitchell",
		"age":    91,
		"emails": []string{"one", "two", "three"},
		"extra": map[string]string{
			"twitter": "mitchellh",
		},
	}

	var result Person
	err := Decode(input, &result)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%#v", result)
	// Output:
	// mapstructure.Person{Name:"Mitchell", Age:91, Emails:[]string{"one", "two", "three"}, Extra:map[string]string{"twitter":"mitchellh"}}
}

func ExampleDecode_errors() {
	type Person struct {
		Name   string
		Age    int
		Emails []string
		Extra  map[string]string
	}

	// This input can come from anywhere, but typically comes from
	// something like decoding JSON where we're not quite sure of the
	// struct initially.
	input := map[string]interface{}{
		"name":   123,
		"age":    "bad value",
		"emails": []int{1, 2, 3},
	}

	var result Person
	err := Decode(input, &result)
	if err == nil {
		panic("should have an error")
	}

	fmt.Println(err.Error())
	// Output:
	// 5 error(s) decoding:
	//
	// * 'Age' expected type 'int', got unconvertible type 'string'
	// * 'Emails[0]' expected type 'string', got unconvertible type 'int'
	// * 'Emails[1]' expected type 'string', got unconvertible type 'int'
	// * 'Emails[2]' expected type 'string', got unconvertible type 'int'
	// * 'Name' expected type 'string', got unconvertible type 'int'
}

func ExampleDecode_metadata() {
	type Person struct {
		Name string
		Age  int
	}

	// This input can come from anywhere, but typically comes from
	// something like decoding JSON where we're not quite sure of the
	// struct initially.
	input := map[string]interface{}{
		"name":  "Mitchell",
		"age":   91,
		"email": "foo@bar.com",
	}

	// For metadata, we make a more advanced DecoderConfig so we can
	// more finely configure the decoder that is used. In this case, we
	// just tell the decoder we want to track metadata.
	var md Metadata
	var result Person
	config := &DecoderConfig{
		Metadata: &md,
		Result:   &result,
	}

	decoder, err := NewDecoder(config)
	if err != nil {
		panic(err)
	}

	if err := decoder.Decode(input); err != nil {
		panic(err)
	}

	fmt.Printf("Unused keys: %#v", md.Unused)
	// Output:
	// Unused keys: []string{"email"}
}

func ExampleDecode_weaklyTypedInput() {
	type Person struct {
		Name   string
		Age    int
		Emails []string
	}

	// This input can come from anywhere, but typically comes from
	// something like decoding JSON, generated by a weakly typed language
	// such as PHP.
	input := map[string]interface{}{
		"name":   123,                      // number => string
		"age":    "42",                     // string => number
		"emails": map[string]interface{}{}, // empty map => empty array
	}

	var result Person
	config := &DecoderConfig{
		WeaklyTypedInput: true,
		Result:           &result,
	}

	decoder, err := NewDecoder(config)
	if err != nil {
		panic(err)
	}

	err = decoder.Decode(input)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%#v", result)
	// Output: mapstructure.Person{Name:"123", Age:42, Emails:[]string{}}
}

func ExampleDecode_tags() {
	// Note that the mapstructure tags defined in the struct type
	// can indicate which fields the values are mapped to.
	type Person struct {
		Name string `mapstructure:"person_name"`
		Age  int    `mapstructure:"person_age"`
	}

	input := map[string]interface{}{
		"person_name": "Mitchell",
		"person_age":  91,
	}

	var result Person
	err := Decode(input, &result)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%#v", result)
	// Output:
	// mapstructure.Person{Name:"Mitchell", Age:91}
}

func ExampleDecode_embeddedStruct() {
	// Squashing multiple embedded structs is allowed using the squash tag.
	// This is demonstrated by creating a composite struct of multiple types
	// and decoding into it. In this case, a person can carry with it both
	// a Family and a Location, as well as their own FirstName.
	type Family struct {
		LastName string
	}
	type Location struct {
		City string
	}
	type Person struct {
		Family    `mapstructure:",squash"`
		Location  `mapstructure:",squash"`
		FirstName string
	}

	input := map[string]interface{}{
		"FirstName": "Mitchell",
		"LastName":  "Hashimoto",
		"City":      "San Francisco",
	}

	var result Person
	err := Decode(input, &result)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%s %s, %s", result.FirstName, result.LastName, result.City)
	// Output:
	// Mitchell Hashimoto, San Francisco
}