https://play.golang.org/p/D17WYx6mRr
To not relay on links only, whole working program:
package main
import (
"fmt"
)
type ExportJob struct {
AssetID string `json:"asset_id"`
ObjectType string `json:"object_type"`
Usage string `json:"usage"`
Reference string `json:"reference"`
Chunk string `json:"chunk_id"`
Ordering uint64 `json:"ordering"`
Formats []struct {
SizePreset string `json:"size_preset"`
Fit string `json:"fit"`
OutputFormat string `json:"output_format"`
Location string `json:"location"`
BackgroundColor string `json:"background_color"`
Height uint64 `json:"height"`
Width uint64 `json:"width"`
Trimfactor uint64 `json:"trimfactor"`
Quality uint64 `json:"quality"`
} `json:"formats"`
}
func main() {
job := ExportJob{
AssetID: "blablat",
ObjectType: "blablab",
Reference: "blbla",
Ordering: 0,
Chunk: "blablba",
Formats: []struct {
SizePreset string `json:"size_preset"`
Fit string `json:"fit"`
OutputFormat string `json:"output_format"`
Location string `json:"location"`
BackgroundColor string `json:"background_color"`
Height uint64 `json:"height"`
Width uint64 `json:"width"`
Trimfactor uint64 `json:"trimfactor"`
Quality uint64 `json:"quality"`
}{struct {
SizePreset string `json:"size_preset"`
Fit string `json:"fit"`
OutputFormat string `json:"output_format"`
Location string `json:"location"`
BackgroundColor string `json:"background_color"`
Height uint64 `json:"height"`
Width uint64 `json:"width"`
Trimfactor uint64 `json:"trimfactor"`
Quality uint64 `json:"quality"`
}{SizePreset: "no",
Fit: "blah",
OutputFormat: "blub",
Location: "loc",
BackgroundColor: "green",
Height: 1,
Width: 2,
Trimfactor: 4,
Quality: 7,
},
},
}
fmt.Println(job)
}
My opinion: ugly as hell and error prone, as it is easy to miss a tag or omit a field and get compiler errors which aren't that helpful. (They tell you, you can't use that as field value or some such, but don't analyse whats the difference between the type you used and the type that was expected, to make it easier for you, to find your omission/typo.)
And I dread to think about, how that looks if you start to pour more
than one element in the slice literal.
And yes, you can't omit the tags, as they take part in type identity, as stated here golang spec last paragraph before the last code example.
As grokify pointed out, you don't need to repeat the struct type for each slice element, so this works as well:
package main
import (
"fmt"
)
type ExportJob struct {
AssetID string `json:"asset_id"`
ObjectType string `json:"object_type"`
Usage string `json:"usage"`
Reference string `json:"reference"`
Chunk string `json:"chunk_id"`
Ordering uint64 `json:"ordering"`
Formats []struct {
SizePreset string `json:"size_preset"`
Fit string `json:"fit"`
OutputFormat string `json:"output_format"`
Location string `json:"location"`
BackgroundColor string `json:"background_color"`
Height uint64 `json:"height"`
Width uint64 `json:"width"`
Trimfactor uint64 `json:"trimfactor"`
Quality uint64 `json:"quality"`
} `json:"formats"`
}
func main() {
job := ExportJob{
AssetID: "blablat",
ObjectType: "blablab",
Reference: "blbla",
Ordering: 0,
Chunk: "blablba",
Formats: []struct {
SizePreset string `json:"size_preset"`
Fit string `json:"fit"`
OutputFormat string `json:"output_format"`
Location string `json:"location"`
BackgroundColor string `json:"background_color"`
Height uint64 `json:"height"`
Width uint64 `json:"width"`
Trimfactor uint64 `json:"trimfactor"`
Quality uint64 `json:"quality"`
}{{SizePreset: "no",
Fit: "blah",
OutputFormat: "blub",
Location: "loc",
BackgroundColor: "green",
Height: 1,
Width: 2,
Trimfactor: 4,
Quality: 7,
},
},
}
fmt.Println(job)
}
In my opinion slightly better, but still not good, as you still have more work to do if you alter the embedded type. (In comparsion to naming the embedded type).
