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writer.go
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writer.go
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package csv
import (
"encoding/csv"
"fmt"
"github.com/qor/exchange"
"github.com/qor/qor"
"github.com/qor/qor/resource"
"github.com/qor/roles"
)
// NewWriter new csv writer
func (c *CSV) NewWriter(res *exchange.Resource, context *qor.Context) (exchange.Writer, error) {
writer := &Writer{CSV: c, Resource: res, context: context}
var metas []*exchange.Meta
for _, meta := range res.Metas {
if meta.HasPermission(roles.Read, context) {
metas = append(metas, meta)
}
}
writer.metas = metas
csvWriter, err := c.getWriter()
if err == nil {
writer.Writer = csv.NewWriter(csvWriter)
}
return writer, err
}
// Writer CSV writer struct
type Writer struct {
*CSV
context *qor.Context
Resource *exchange.Resource
Writer *csv.Writer
metas []*exchange.Meta
}
// WriteHeader write header
func (writer *Writer) WriteHeader() error {
if !writer.Resource.Config.WithoutHeader {
var results []string
for _, meta := range writer.metas {
results = append(results, meta.Header)
}
writer.Writer.Write(results)
}
return nil
}
// WriteRow write row
func (writer *Writer) WriteRow(record interface{}) (*resource.MetaValues, error) {
var metaValues resource.MetaValues
var results []string
for _, meta := range writer.metas {
value := meta.GetFormattedValuer()(record, writer.context)
metaValue := resource.MetaValue{
Name: meta.GetName(),
Value: value,
}
metaValues.Values = append(metaValues.Values, &metaValue)
results = append(results, fmt.Sprint(value))
}
return &metaValues, writer.Writer.Write(results)
}
// Flush flush all changes
func (writer *Writer) Flush() error {
writer.Writer.Flush()
return nil
}