diff options
Diffstat (limited to 'guix-data-service/model/utils.scm')
| -rw-r--r-- | guix-data-service/model/utils.scm | 45 |
1 files changed, 37 insertions, 8 deletions
diff --git a/guix-data-service/model/utils.scm b/guix-data-service/model/utils.scm index 3b256f1..5676c23 100644 --- a/guix-data-service/model/utils.scm +++ b/guix-data-service/model/utils.scm @@ -162,6 +162,23 @@ WHERE table_name = $1" (error (simple-format #f "error: unknown type for value: ~A" v))))) + (define schema-details + (table-schema conn table-name)) + + (define (field-can-be-null? field) + (match (find (lambda (column-data) + (string=? field + (car column-data))) + schema-details) + ((column-name data-type is-nullable?) is-nullable?) + (#f + (simple-format + (current-error-port) + "error: couldn't find data for ~A in ~A\n" + field + schema-details) + (error "error: field-can-be-null?")))) + (define select-query (string-append "SELECT id, " @@ -187,10 +204,15 @@ WHERE table_name = $1" "ON " (string-join (map (lambda (field) - (string-append - "(" table-name "." field " = vals." field - " OR (" table-name "." field " IS NULL AND" - " vals." field " IS NULL))")) + (string-concatenate + `("(" + ,table-name "." ,field " = vals." ,field + ,@(if (field-can-be-null? field) + `(" OR (" ,table-name "." ,field " IS NULL AND" + " vals." ,field " IS NULL" + ")") + '()) + ")"))) field-strings) " AND "))) @@ -206,10 +228,17 @@ WHERE table_name = $1" " ON " (string-join (map (lambda (field) - (string-append - "(" table-name "." field " = " temp-table-name "." field - " OR (" table-name "." field " IS NULL AND" - " " temp-table-name "." field " IS NULL))")) + (string-concatenate + `("(" + ,table-name "." ,field " = " ,temp-table-name "." ,field + ,@(if (field-can-be-null? field) + `(" OR (" + ,table-name "." ,field " IS NULL" + " AND " + ,temp-table-name "." ,field " IS NULL" + ")") + '()) + ")"))) field-strings) " AND "))) |