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package migratetest
import (
"slices"
"sort"
"strings"
)
// TableSnapshot is a snapshot of a table's data.
type TableSnapshot struct {
// Name is the name of the table.
Name string
Columns []string
Rows [][]string
}
func (t TableSnapshot) EntityName() string { return t.Name }
type columnSort TableSnapshot
func (data *columnSort) Len() int { return len(data.Columns) }
func (data *columnSort) Less(i, j int) bool {
// sort by column name, but prefer "id" as the first column
if data.Columns[i] == "id" {
return true
}
if data.Columns[j] == "id" {
return false
}
return data.Columns[i] < data.Columns[j]
}
func (data *columnSort) Swap(i, j int) {
data.Columns[i], data.Columns[j] = data.Columns[j], data.Columns[i]
for _, row := range data.Rows {
row[i], row[j] = row[j], row[i]
}
}
// Sort sorts the columns and rows of the snapshot.
func (data *TableSnapshot) Sort() {
sort.Sort((*columnSort)(data))
// sort rows by first column, then second, etc.
slices.SortFunc(data.Rows, func(a, b []string) int {
for i := range a {
if a[i] != b[i] {
return strings.Compare(a[i], b[i])
}
}
return 0
})
}
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