sorry for solution remark
and also removed unique part still same error
and below is my model
{
"kind": "collectionType",
"collectionName": "merchants",
"info": {
"singularName": "merchant",
"pluralName": "merchants",
"displayName": "Merchant",
"description": ""
},
"options": {
"draftAndPublish": true
},
"pluginOptions": {},
"attributes": {
"merchantname": {
"type": "string"
},
"merchant": {
"type": "uid",
"targetField": "merchantname"
},
"slug":{
"type": "string"
},
"products": {
"type": "relation",
"relation": "oneToMany",
"target": "api::product.product"
}
}
}
still same error