<if-exists> execute a block if an object exists in the database

name

if-exists

xml namespace

http://moyaproject.com/db

Execute the enclosed block if a object exists in the db.

Example

<db:if-exists model="#Link" let:topic="topic" let:slug="slug" >
    <forms:error>Slug exists, please edit the title</forms:error>
    <break/>
</db:if-exists>

attributes

name	purpose	type	required?	default	choices
db	Database	text	No	"_default"
filter	Filter expression	database expression	No
from	Application	application reference	No
model	Model	text	No
modelobj	Model object	expression	No	None

inherited attributes

name	purpose	type	required?	default	choices
if	Conditional expression	expression	No	yes