71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
package resolvers
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import (
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"fmt"
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"strings"
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"github.com/pocketbase/dbx"
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)
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var _ dbx.Expression = (*multiMatchSubquery)(nil)
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// join defines the specification for a single SQL JOIN clause.
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type join struct {
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tableName string
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tableAlias string
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on dbx.Expression
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}
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// multiMatchSubquery defines a record multi-match subquery expression.
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type multiMatchSubquery struct {
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baseTableAlias string
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fromTableName string
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fromTableAlias string
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valueIdentifier string
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joins []*join
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params dbx.Params
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}
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// Build converts the expression into a SQL fragment.
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//
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// Implements [dbx.Expression] interface.
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func (m *multiMatchSubquery) Build(db *dbx.DB, params dbx.Params) string {
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if m.baseTableAlias == "" || m.fromTableName == "" || m.fromTableAlias == "" {
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return "0=1"
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}
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if params == nil {
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params = m.params
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} else {
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// merge by updating the parent params
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for k, v := range m.params {
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params[k] = v
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}
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}
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var mergedJoins strings.Builder
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for i, j := range m.joins {
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if i > 0 {
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mergedJoins.WriteString(" ")
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}
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mergedJoins.WriteString("LEFT JOIN ")
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mergedJoins.WriteString(db.QuoteTableName(j.tableName))
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mergedJoins.WriteString(" ")
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mergedJoins.WriteString(db.QuoteTableName(j.tableAlias))
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if j.on != nil {
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mergedJoins.WriteString(" ON ")
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mergedJoins.WriteString(j.on.Build(db, params))
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}
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}
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return fmt.Sprintf(
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`SELECT %s as [[multiMatchValue]] FROM %s %s %s WHERE %s = %s`,
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db.QuoteColumnName(m.valueIdentifier),
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db.QuoteTableName(m.fromTableName),
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db.QuoteTableName(m.fromTableAlias),
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mergedJoins.String(),
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db.QuoteColumnName(m.fromTableAlias+".id"),
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db.QuoteColumnName(m.baseTableAlias+".id"),
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)
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}
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