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fix diff round-trip comparison

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This commit is contained in:
SG Command
2026-08-31 02:05:32 +02:00
parent 098e927760
commit e8ac0e8c35
8 changed files with 275 additions and 30 deletions
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pkg/diff/diff.go
+158 -30
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@@ -4,6 +4,8 @@ import (
"fmt"
"reflect"
"sort"
"strconv"
"strings"
"git.warky.dev/wdevs/relspecgo/pkg/models"
)
@@ -229,11 +231,13 @@ func compareColumns(source, target map[string]*models.Column) *ColumnDiff {
func compareColumnDetails(source, target *models.Column) map[string]any {
changes := make(map[string]any)
sourceType, sourceLength, sourceDefault := comparableColumn(source)
targetType, targetLength, targetDefault := comparableColumn(target)
if source.Type != target.Type {
if sourceType != targetType {
changes["type"] = map[string]string{"source": source.Type, "target": target.Type}
}
if source.Length != target.Length {
if sourceLength != targetLength {
changes["length"] = map[string]int{"source": source.Length, "target": target.Length}
}
if source.Precision != target.Precision {
@@ -245,8 +249,8 @@ func compareColumnDetails(source, target *models.Column) map[string]any {
if source.NotNull != target.NotNull {
changes["not_null"] = map[string]bool{"source": source.NotNull, "target": target.NotNull}
}
if !reflect.DeepEqual(source.Default, target.Default) {
changes["default"] = map[string]any{"source": source.Default, "target": target.Default}
if !reflect.DeepEqual(sourceDefault, targetDefault) {
changes["default"] = map[string]any{"source": sourceDefault, "target": targetDefault}
}
if source.AutoIncrement != target.AutoIncrement {
changes["auto_increment"] = map[string]bool{"source": source.AutoIncrement, "target": target.AutoIncrement}
@@ -258,6 +262,28 @@ func compareColumnDetails(source, target *models.Column) map[string]any {
return changes
}
// comparableColumn accepts DBML's compact type/default spelling as well as
// PostgreSQL's normalized fields (for example varchar(255) vs varchar + 255).
func comparableColumn(column *models.Column) (string, int, any) {
typeName := strings.TrimSpace(column.Type)
defaultValue := column.Default
lower := strings.ToLower(typeName)
if i := strings.Index(lower, " default "); i >= 0 {
if defaultValue == nil {
defaultValue = strings.TrimSpace(typeName[i+len(" default "):])
}
typeName = strings.TrimSpace(typeName[:i])
}
length := column.Length
if open := strings.LastIndex(typeName, "("); open >= 0 && strings.HasSuffix(typeName, ")") {
if parsed, err := strconv.Atoi(strings.TrimSpace(typeName[open+1 : len(typeName)-1])); err == nil && length == 0 {
length = parsed
}
typeName = strings.TrimSpace(typeName[:open])
}
return strings.ToLower(typeName), length, defaultValue
}
func compareIndexes(source, target map[string]*models.Index) *IndexDiff {
diff := &IndexDiff{
Missing: make([]*models.Index, 0),
@@ -265,34 +291,87 @@ func compareIndexes(source, target map[string]*models.Index) *IndexDiff {
Modified: make([]*IndexChange, 0),
}
// Find missing and modified indexes
// Match by name first, then by definition. PostgreSQL and DBML can assign
// different names to the same index (for example, posts_user_id_title_idx
// and uidx_posts_user_id_title), so a name-only comparison reports false
// drift after a merge/diff round trip.
unmatchedSource := make(map[string]*models.Index, len(source))
unmatchedTarget := make(map[string]*models.Index, len(target))
for name, index := range source {
unmatchedSource[name] = index
}
for name, index := range target {
unmatchedTarget[name] = index
}
for _, name := range sortedKeys(source) {
srcIdx := source[name]
if tgtIdx, exists := target[name]; !exists {
tgtIdx, exists := target[name]
if !exists {
continue
}
delete(unmatchedSource, name)
delete(unmatchedTarget, name)
if changes := compareIndexDetails(srcIdx, tgtIdx); len(changes) > 0 {
diff.Modified = append(diff.Modified, &IndexChange{
Name: name,
Source: srcIdx,
Target: tgtIdx,
Changes: changes,
})
}
}
// Pair remaining indexes by their structural identity, independent of the
// generated/name field. The sorted iteration makes ambiguous matches
// deterministic; duplicate definitions are still represented as separate
// indexes by consuming one target at a time.
remainingTarget := make(map[string][]*models.Index)
for _, name := range sortedKeys(unmatchedTarget) {
index := unmatchedTarget[name]
key := indexDefinitionKey(index)
remainingTarget[key] = append(remainingTarget[key], index)
}
for _, name := range sortedKeys(unmatchedSource) {
srcIdx := unmatchedSource[name]
key := indexDefinitionKey(srcIdx)
candidates := remainingTarget[key]
if len(candidates) == 0 {
diff.Missing = append(diff.Missing, srcIdx)
} else {
if changes := compareIndexDetails(srcIdx, tgtIdx); len(changes) > 0 {
diff.Modified = append(diff.Modified, &IndexChange{
Name: name,
Source: srcIdx,
Target: tgtIdx,
Changes: changes,
})
}
continue
}
tgtIdx := candidates[0]
remainingTarget[key] = candidates[1:]
if changes := compareIndexDetails(srcIdx, tgtIdx); len(changes) > 0 {
diff.Modified = append(diff.Modified, &IndexChange{
Name: srcIdx.Name,
Source: srcIdx,
Target: tgtIdx,
Changes: changes,
})
}
}
// Find extra indexes
for _, name := range sortedKeys(target) {
tgtIdx := target[name]
if _, exists := source[name]; !exists {
diff.Extra = append(diff.Extra, tgtIdx)
for _, key := range sortedKeys(remainingTarget) {
for _, index := range remainingTarget[key] {
diff.Extra = append(diff.Extra, index)
}
}
return diff
}
func indexDefinitionKey(index *models.Index) string {
return fmt.Sprintf("%t:%s:%s", index.Unique, strings.Join(index.Columns, ","), strings.Join(index.Include, ","))
}
func comparableIndexType(indexType string) string {
indexType = strings.ToLower(strings.TrimSpace(indexType))
if indexType == "" {
return "btree"
}
return indexType
}
func compareIndexDetails(source, target *models.Index) map[string]any {
changes := make(map[string]any)
@@ -302,7 +381,7 @@ func compareIndexDetails(source, target *models.Index) map[string]any {
if source.Unique != target.Unique {
changes["unique"] = map[string]bool{"source": source.Unique, "target": target.Unique}
}
if source.Type != target.Type {
if comparableIndexType(source.Type) != comparableIndexType(target.Type) {
changes["type"] = map[string]string{"source": source.Type, "target": target.Type}
}
if source.Where != target.Where {
@@ -312,7 +391,26 @@ func compareIndexDetails(source, target *models.Index) map[string]any {
return changes
}
// Compare constraints.
// Primary-key constraints are excluded: a PK is already represented by the
// column's IsPrimaryKey flag, which compareColumns already compares. The
// PostgreSQL reader additionally materialises each PK as a primary_key
// constraint and a unique btree index; the DBML reader keeps PKs as column
// flags only. Comparing the constraint maps directly would therefore report
// every PK as an "extra" constraint and the generated index as an "extra"
// index on a freshly-applied schema. Filtering them here keeps the round
// trip stable without losing real PK information.
func compareConstraints(source, target map[string]*models.Constraint) *ConstraintDiff {
filteredSource := filterPrimaryKeyConstraints(source)
filteredTarget := filterPrimaryKeyConstraints(target)
sourceByKey := make(map[string]*models.Constraint, len(filteredSource))
targetByKey := make(map[string]*models.Constraint, len(filteredTarget))
for _, constraint := range filteredSource {
sourceByKey[constraintCompareKey(constraint)] = constraint
}
for _, constraint := range filteredTarget {
targetByKey[constraintCompareKey(constraint)] = constraint
}
diff := &ConstraintDiff{
Missing: make([]*models.Constraint, 0),
Extra: make([]*models.Constraint, 0),
@@ -320,9 +418,9 @@ func compareConstraints(source, target map[string]*models.Constraint) *Constrain
}
// Find missing and modified constraints
for _, name := range sortedKeys(source) {
srcCon := source[name]
if tgtCon, exists := target[name]; !exists {
for _, name := range sortedKeys(sourceByKey) {
srcCon := sourceByKey[name]
if tgtCon, exists := targetByKey[name]; !exists {
diff.Missing = append(diff.Missing, srcCon)
} else {
if changes := compareConstraintDetails(srcCon, tgtCon); len(changes) > 0 {
@@ -337,9 +435,9 @@ func compareConstraints(source, target map[string]*models.Constraint) *Constrain
}
// Find extra constraints
for _, name := range sortedKeys(target) {
tgtCon := target[name]
if _, exists := source[name]; !exists {
for _, name := range sortedKeys(targetByKey) {
tgtCon := targetByKey[name]
if _, exists := sourceByKey[name]; !exists {
diff.Extra = append(diff.Extra, tgtCon)
}
}
@@ -347,6 +445,29 @@ func compareConstraints(source, target map[string]*models.Constraint) *Constrain
return diff
}
// filterPrimaryKeyConstraints drops primary_key constraints from a single
// map. Primary keys are compared by the column IsPrimaryKey flag in
// compareColumns, so comparing the primary_key constraints here only
// produces duplicate "extra" entries (every PK is extra on the DBML side).
// Other constraint types are preserved untouched.
func filterPrimaryKeyConstraints(m map[string]*models.Constraint) map[string]*models.Constraint {
out := make(map[string]*models.Constraint, len(m))
for name, c := range m {
if c.Type == models.PrimaryKeyConstraint {
continue
}
out[name] = c
}
return out
}
func constraintCompareKey(constraint *models.Constraint) string {
if constraint.Type != models.ForeignKeyConstraint {
return constraint.SQLName()
}
return fmt.Sprintf("fk:%s:%s:%s:%s:%s:%s", strings.ToLower(constraint.Schema), strings.ToLower(constraint.Table), strings.Join(constraint.Columns, ","), strings.ToLower(constraint.ReferencedSchema), strings.ToLower(constraint.ReferencedTable), strings.Join(constraint.ReferencedColumns, ","))
}
func compareConstraintDetails(source, target *models.Constraint) map[string]any {
changes := make(map[string]any)
@@ -362,16 +483,23 @@ func compareConstraintDetails(source, target *models.Constraint) map[string]any
if !reflect.DeepEqual(source.ReferencedColumns, target.ReferencedColumns) {
changes["referenced_columns"] = map[string][]string{"source": source.ReferencedColumns, "target": target.ReferencedColumns}
}
if source.OnDelete != target.OnDelete {
if normalizeConstraintAction(source.OnDelete) != normalizeConstraintAction(target.OnDelete) {
changes["on_delete"] = map[string]string{"source": source.OnDelete, "target": target.OnDelete}
}
if source.OnUpdate != target.OnUpdate {
if normalizeConstraintAction(source.OnUpdate) != normalizeConstraintAction(target.OnUpdate) {
changes["on_update"] = map[string]string{"source": source.OnUpdate, "target": target.OnUpdate}
}
return changes
}
func normalizeConstraintAction(action string) string {
if strings.EqualFold(strings.TrimSpace(action), "NO ACTION") {
return ""
}
return strings.ToUpper(strings.TrimSpace(action))
}
func compareRelationships(source, target map[string]*models.Relationship) *RelationshipDiff {
diff := &RelationshipDiff{
Missing: make([]*models.Relationship, 0),