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Ruby Ruby on Rails 5 Basics Adding a Model Attribute Updating Strong Parameters

Unknown error

ActiveModel::UnknownAttributeError in PostsController#update unknown attribute 'body' for Post. Extracted source (around line #41): 39 40 41 42 43 44

respond_to do |format|

  if @post.update(post_params)
    format.html { redirect_to post_url(@post), notice: "Post was successfully updated." }
    format.json { render :show, status: :ok, location: @post }
  else

this is the error I get when I try to update the Body for my posts