fix: erase relations when an empty array is provided

packages/ra-cubicweb/src/createDataProvider.ts

@@ -181,9 +181,6 @@
     const restrictionsUpdate: string[] = [`X is ${resource}, X eid ${id}`];
     let counter = 0;
     Object.entries(data).forEach(([key, value]) => {
-      if (Array.isArray(value) && value.length === 0) {
-        return;
-      }
       if (key in schema.entities[resource]) {
         attributeUpdates.push(`X ${key} ${JSON.stringify(value)}`);
       } else if (subjectRelationsNames(resource).includes(key)) {
@@ -191,7 +188,9 @@
           throw new Error(`An array is expected for relation ${key}.`);
         }
         relationUpdates.push(`X ${key} Y${counter}`);
-        restrictionsUpdate.push(`Y${counter} eid IN (${value.join(", ")})`);
+        if (value.length > 0) {
+          restrictionsUpdate.push(`Y${counter} eid IN (${value.join(", ")})`);
+        }
         counter += 1;
       } else if (
         key.startsWith("reverse_") &&
@@ -200,8 +199,10 @@
         if (!Array.isArray(value)) {
           throw new Error(`An array is expected for relation ${key}.`);
         }
-        relationUpdates.push(`Y${counter} ${key} X`);
-        restrictionsUpdate.push(`Y${counter} eid ${value.join(", ")}`);
+        relationUpdates.push(`Y${counter} ${key.replace("reverse_", "")} X`);
+        if (value.length > 0) {
+          restrictionsUpdate.push(`Y${counter} eid IN (${value.join(", ")})`);
+        }
         counter += 1;
       }
     });