Am I correct in saying that Rails will handle adding associated has_many items to an object if you pass the params in with a definition like tag_ids as an array of ids?
If so, I'm posting the following to my Item controller:-
{
"title": "Bottle",
"tag_ids": [25, 26]
}
What's happening is that the tag_ids are being ignored. I already added tag with id 25, but 26 isn't being included.
My controller:-
# PATCH/PUT /api/items/1
def update
if @item.update(item_params)
render json: @item, include: ['tags']
else
render json: @item.errors
end
end
def item_params
params.require(:item).permit(:name, :tag_ids)
end
Item has_and_belongs_to_many
Tags, and they have a join table of jobs_tags
. The association works because I get Tags returned in my response above. I can't seem to add them however. Any idea where I may be going wrong?
Do I need to explicitly add a tag_ids
field to the Item model?
CodePudding user response:
The tag_ids
parameter is an array. But permit(:name, :tag_ids)
only permits a single tag_ids
attribute.
Change the permission to:
def item_params params.require(:item).permit(:name, tag_ids: []) end
See how to permit an array with strong parameters for more details.