Iron out codegen bugs

README.md

@@ -37,12 +37,18 @@ go-pg-sqlc-crud generate -schema ./schema.sql -output ./generated/schema.crud.sq
 - `-schema`: Path to the PostgreSQL schema dump file (required)
 - `-output`: Path where the generated CRUD file should be written (required)
 
-## Example
-
-```bash
-# Generate CRUD operations from a schema file
-go-pg-sqlc-crud generate -schema ./schema.sql -output ./generated/crud.sql
-```
+## Try it yourself
+
+1. Clone the repo
+2. `cd example`
+3. `docker compose up`
+4. `pg_dump ...`
+5. Run `go-pg-sqlc-crud generate -schema ./schema.sql -output ./generated/crud.sql`
+6. Copy the `crud.sql` over to the directory you've bootstrapped `sqlc` into
+7. Make sure it's included in `sqlc.yaml`
+8. Run `sqlc generate`
+9. If this runs and succeeds, then congrats, the tool works
+10. Please LMK or create a PR if you find bugs! TY
 
 ## How It Works
 

crud/crud.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"reflect"
 	"strings"
 	"text/template"
 )
@@ -87,6 +88,9 @@ func GenerateCRUD(tree string) (string, error) {
 		"add": func(a, b int) int {
 			return a + b
 		},
+		"last": func(x int, a interface{}) bool {
+			return x == reflect.ValueOf(a).Len()-1
+		},
 	}
 	tmpl := template.Must(template.New("crud").Funcs(funcMap).Parse(`
   -- {{ .Schema }}.{{ .Name }} CRUD Operations
@@ -108,7 +112,7 @@ func GenerateCRUD(tree string) (string, error) {
 	{{- if ne $c "id" }}
 	{{- if ne $c "created_at" }}
 	{{- if ne $c "updated_at" }}
-	{{ $c }},
+	{{ $c }}{{ if not (last $i $.Columns) }},{{ end }}
 	{{- end }}
 	{{- end }}
 	{{- end }}
@@ -120,7 +124,7 @@ func GenerateCRUD(tree string) (string, error) {
 	{{- if ne $c "id" }}
 	{{- if ne $c "created_at" }}
 	{{- if ne $c "updated_at" }}
-	${{ $count }},
+	${{ $count }}{{ if not (last $i $.Columns) }},{{ end }}
 	{{- $count = add $count 1 }}
 	{{- end }}
 	{{- end }}
@@ -135,11 +139,10 @@ func GenerateCRUD(tree string) (string, error) {
 	{{- range $i, $c := .Columns }}
 	{{- if ne $c "id" }}
 	{{- if ne $c "created_at" }}
-	{{ $c }} = ${{ add $i 1 }},
+	{{ $c }} = ${{ add $i 1 }}{{ if not (last $i $.Columns) }},{{ end }}
 	{{- end }}
 	{{- end }}
 	{{- end }}
-	updated_at = now()
   WHERE id = $1
   RETURNING {{ range $i, $c := .Columns }}{{ if $i }}, {{ end }}{{ $c }}{{ end }};
 

example/.env

@@ -0,0 +1,4 @@
+POSTGRES_PASSWORD=initexample
+POSTGRES_USER=initexample
+POSTGRES_HOST=postgres
+POSTGRES_DB=initexample

example/README.md

@@ -0,0 +1,12 @@
+# example
+
+- sets up a sample postgres db in docker with a sample schema and sample data
+- just run this with `docker compose up`
+- this should simulate an IRL db that you'd want to do this for
+- then use the `go-pg-sqlc-crud` tool to generate your CRUD and see how well it did!
+
+## credit
+
+huge thanks to @asuarezaceves: <https://medium.com/@asuarezaceves/initializing-a-postgresql-database-with-a-dataset-using-docker-compose-a-step-by-step-guide-3feebd5b1545>
+
+i'm using the same file structure and schema as described in that article