99 lines
1.8 KiB
Go
99 lines
1.8 KiB
Go
package rsql
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import (
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"fmt"
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"reflect"
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"strings"
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"unicode"
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)
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// DbColumns database model metadata
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type DbColumns struct {
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Cols []string
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index map[string]int
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Table string
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View string
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}
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// Col returns the mapped column names
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func (d *DbColumns) Col(column string) (s string, err error) {
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idx, ok := d.Index(column)
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if !ok {
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err = fmt.Errorf("column not found on table: %v", column)
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return
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}
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return d.Cols[idx], err
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}
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// Index returns the column number
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func (d *DbColumns) Index(column string) (idx int, ok bool) {
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idx, ok = d.index[column]
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return
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}
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// GetDbColumns builds a metadata struct
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func GetDbColumns(o interface{}) *DbColumns {
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d := DbColumns{}
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t := reflect.TypeOf(o)
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d.index = make(map[string]int)
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for i := 0; i < t.NumField(); i++ {
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field := t.Field(i)
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tag, _, _ := strings.Cut(field.Tag.Get("db"), ",")
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json := field.Tag.Get("json")
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json, _, _ = strings.Cut(json, ",")
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if tag == "" {
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tag = json
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}
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graphql := field.Tag.Get("graphql")
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graphql, _, _ = strings.Cut(graphql, ",")
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if tag == "" {
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tag = graphql
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}
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if tag == "-" {
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continue
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}
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if tag == "" {
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tag = field.Name
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}
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d.index[field.Name] = len(d.Cols)
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if _, ok := d.index[tag]; !ok && tag != "" {
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d.index[tag] = len(d.Cols)
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}
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if _, ok := d.index[json]; !ok && json != "" {
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d.index[json] = len(d.Cols)
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}
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if _, ok := d.index[graphql]; !ok && graphql != "" {
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d.index[graphql] = len(d.Cols)
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} else if !ok && graphql == "" {
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a := []rune(field.Name)
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for i := 0; i < len(a); i++ {
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if unicode.IsLower(a[i]) {
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break
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}
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a[i] = unicode.ToLower(a[i])
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}
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graphql = string(a)
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d.index[graphql] = len(d.Cols)
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}
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d.Cols = append(d.Cols, tag)
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}
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return &d
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}
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func QuoteCols(cols []string) []string {
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lis := make([]string, len(cols))
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for i := range cols {
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lis[i] = `"` + cols[i] + `"`
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}
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return lis
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}
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