In yourtest() function, you run query onupload table. So it can not matchFace.celebrity_id field from your query. Two things you have know first:
Condition you are writing inconditions clause is applied on the table matching with your model. In your case,upload is the table on which query is executed and your table contains no fieldFace.celebrity_id.
$hasMany creates application level relations(associations). So by doing query like you have written intest() function, it doesn't join the query results.
This will return all rows ofupload table with associated row offace table ifcelebrity_id is4018, otherwisenull array.
Hope this will help you and if you want that only those many rows will be returned which are associated withFace.celebrity_id = 4018, first you have to run query onface table and then another on first query result.
For more detail of second case you can refer this.
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