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Home/Questions/how to solve "ActionController::UnknownFormat" error
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ferneparker
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ferneparker
Asked: June 15, 20222022-06-15T17:19:07+00:00 2022-06-15T17:19:07+00:00In: Error

how to solve “ActionController::UnknownFormat” error

  • 3

I am facing a problem with an error named “ActionController::UnknownFormat”, so I really need your help. I built an application in which the actions respond with HTML templates yesterday, the users feedbacked to me that when they requested the JSON version of the page, they received a 406 Not Acceptable response. Then I check my log and I found this error, looking a bit like this:

ActionController::UnknownFormat (ActionController::UnknownFormat):

As following is a piece of code to built my application: 

class BlogPostsController < ApplicationController
def index
respond_to do |format|
format.html { render :index }
end
end
end

If you know of a solution, please share it with me in the comments section below.  

:unknownformatactioncontroller
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    dhtutoria Expert
    2022-06-15T17:28:52+00:00Added an answer on June 15, 2022 at 5:28 pm

    Cause: The “ActionController::UnknownFormat” error occured because you set HTML as the only format to react to. As a result, you missed a format in a response that you wish to support.

    Solution: When writing a blog post, you should consider an action where you want to reply to HTML and JSON queries to help your page be able to support an Ajax request. This is what it may look like:

    class BlogPostsController < ApplicationController
    def create
    @blog_post = BlogPost.new(blog_post_params)
    respond_to do |format|
    if @blog_post.save
    format.html { redirect blog_post_path(@blog_post) }
    format.json { render json: @blog_post.to_json }
    else
    render :new
    end
    end
    end
    end

    When the blog post fails validations and is not saved, this error is raised. within the response block’s scope of word formatting blocks, You must use the render command. If you were to rewrite this to account for failure, it would look like this:

    class BlogPostsController < ApplicationController
    def create
    @blog_post = BlogPost.new(blog_post_params)
    respond_to do |format|
    if @blog_post.save
    format.html { redirect blog_post_path(@blog_post) }
    format.json { render json: @blog_post.to_json }
    else
    format.html { render :new }
    format.json { render json: @blog_post.errors.to_json }
    end
    end
    end
    end

    And now, there will be no more unintended ActionController::UnknownFormat exceptions that all formats have been declared.

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