orm: move fields fetching to a separate function to remove copy pasta

vlib/v/ast/ast.v

@@ -819,10 +819,12 @@ pub struct SqlStmt {
 pub:
 	kind SqlStmtKind
 	db_expr    Expr // `db` in `sql db {`
-	table_name      string
 	object_var_name string // `user`
 	table_type      table.Type
 	pos token.Position
+pub mut:
+	table_name string
+	fields     []table.Field
 }
 
 pub struct SqlExpr {

vlib/v/checker/checker.v

@@ -2683,14 +2683,7 @@ fn (c &Checker) fileis(s string) bool {
 fn (mut c Checker) sql_expr(mut node ast.SqlExpr) table.Type {
 	sym := c.table.get_type_symbol(node.table_type)
 	info := sym.info as table.Struct
-	fields := info.fields.filter(it.typ in [table.string_type, table.int_type, table.bool_type] &&
+	fields := c.fetch_and_verify_orm_fields(info, node.pos, node.table_name)
-		'skip' !in it.attrs)
-	if fields.len == 0 {
-		c.error('V orm: select: empty fields in `$node.table_name`', node.pos)
-	}
-	if fields[0].name != 'id' {
-		c.error('V orm: `id int` must be the first field in `$node.table_name`', node.pos)
-	}
 	node.fields = fields
 	node.table_name = sym.name
 	if node.has_where {
@@ -2715,11 +2708,31 @@ fn (mut c Checker) sql_expr(mut node ast.SqlExpr) table.Type {
 	return node.typ
 }
 
-fn (mut c Checker) sql_stmt(node ast.SqlStmt) table.Type {
+fn (mut c Checker) sql_stmt(mut node ast.SqlStmt) table.Type {
+	//vlib/v/gen/sql.v:37:18: error: undefined ident: `fields`
+	//vlib/v/gen/sql.v:28:12: error: unknown selector expression
+	sym := c.table.get_type_symbol(node.table_type)
+	info := sym.info as table.Struct
+	fields := c.fetch_and_verify_orm_fields(info, node.pos, node.table_name)
+	node.fields = fields
 	c.expr(node.db_expr)
 	return table.void_type
 }
 
+fn (c &Checker) fetch_and_verify_orm_fields(info table.Struct, pos token.Position, table_name string) []table.Field {
+	fields := info.fields.filter(it.typ in [table.string_type, table.int_type, table.bool_type] &&
+		'skip' !in it.attrs)
+	if fields.len == 0 {
+		c.error('V orm: select: empty fields in `$table_name`', pos)
+	}
+	if fields[0].name != 'id' {
+		c.error('V orm: `id int` must be the first field in `$table_name`', pos)
+	}
+	return fields
+}
+
+
+
 fn (mut c Checker) fn_decl(it ast.FnDecl) {
 	if it.is_generic && c.cur_generic_type == 0 { // need the cur_generic_type check to avoid inf. recursion
 		// loop thru each generic type and generate a function

vlib/v/gen/cgen.v

@@ -751,7 +751,7 @@ fn (mut g Gen) stmt(node ast.Stmt) {
 			g.return_statement(node)
 		}
 		ast.SqlStmt {
-			g.sql_insert_expr(node)
+			g.sql_stmt(node)
 		}
 		ast.StructDecl {
 			name := if node.language == .c { node.name.replace('.', '__') } else { c_name(node.name) }

vlib/v/gen/sql.v

@@ -1,6 +1,5 @@
 // Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
-// Use of this source code is governed by an MIT license
+// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
-// that can be found in the LICENSE file.
 module gen
 
 import v.ast
@@ -14,11 +13,7 @@ const (
 
 enum SqlExprSide { left right }
 
-fn (mut g Gen) sql_insert_expr(node ast.SqlStmt) {
+fn (mut g Gen) sql_stmt(node ast.SqlStmt) {
-	sym := g.table.get_type_symbol(node.table_type)
-	info := sym.info as table.Struct
-	fields := info.fields.filter(it.typ in [table.string_type, table.int_type, table.bool_type] &&
-		'skip' !in it.attrs)
 	g.writeln('\n\t// sql insert')
 	db_name := g.new_tmp_var()
 	g.sql_stmt_name = g.new_tmp_var()
@@ -26,29 +21,29 @@ fn (mut g Gen) sql_insert_expr(node ast.SqlStmt) {
 	g.expr(node.db_expr)
 	g.writeln(';')
 	mut q := 'insert into $node.table_name ('
-	for i, field in fields {
+	for i, field in node.fields {
 		if field.name == 'id' {
 			continue
 		}
 		q += '$field.name'
-		if i < fields.len - 1 {
+		if i < node.fields.len - 1 {
 			q += ', '
 		}
 	}
 	q += ') values ('
-	for i, field in fields {
+	for i, field in node.fields {
 		if field.name == 'id' {
 			continue
 		}
 		q += '?${i+0}'
-		if i < fields.len - 1 {
+		if i < node.fields.len - 1 {
 			q += ', '
 		}
 	}
 	q += ')'
 	println(q)
 	g.writeln('sqlite3_stmt* $g.sql_stmt_name = ${dbtype}__DB_init_stmt($db_name, tos_lit("$q"));')
-	for i, field in fields {
+	for i, field in node.fields {
 		if field.name == 'id' {
 			continue
 		}