删除（销毁）属于另一个类对象的类对象

Question

我试图删除属于另一个类对象的类对象，但destroy方法实际上是删除has_many的类对象而不是删除单挑的belongs_to类对象。我在这里错过了什么？

Animal.rb

class Animal < ApplicationRecord
    has_many :sightings, dependent: :destroy
end

Sightings.rb

class Sighting < ApplicationRecord
    belongs_to :animal
end

瞄准控制器

class SightingsController < ApplicationController

    def index
        @sightings = Animal.sightings.all
    end

    def create
        @animal = Animal.find(params[:animal_id])
        @sighting = @animal.sightings.create(sighting_params)
        redirect_to @animal
    end

    def new
        @animal = Animal.find(params[:animal_id])
        @sighting = @animal.sightings.create(sighting_params)
    end

    def edit
        @animal = Animal.find(params[:animal_id])
        @sighting = @animal.sightings.find(params[:id])
    end

    def update
        @animal = Animal.find(params[:animal_id])
        @sighting = @animal.sightings.find(params[:id])

        if @sighting.update_attributes(sighting_params)
            redirect_to @animal
        else
            redirect_to 'edit'
        end
    end

    def destroy
        @animal = Animal.find(params[:animal_id])
        @sighting = Sighting.find(params[:id])
        @sighting.destroy

        redirect_to root_path
    end

    private

    def sighting_params
        params.require(:sighting).permit(:animal_id, :date, :time, :latitude, :longitude)
    end
end

删除按钮（使用Bulma类FYI）此外，它位于我的ANIMAL show.html.erb文件中。

<%= link_to "Delete Sighting ID#: #{sighting.id}", sighting_path(sighting), method: :delete, data: { confirm: "Are you sure you want to delete this sighting?" }, class: "button is-danger" %>

据我了解，为了删除/破坏动物的目击，我需要在删除目击之前收集动物ID，因为目击属于动物。我以为我这样做但是如上所述，删除按钮正在删除动物本身，而不是实际的特定目击。

在此先感谢任何帮助/澄清。