ruby on rails 4 - First argument in form cannot contain nil or be empty on line 3 -


i have read plenty on subject dont understand why wouldnt working way im doing it. im instantiating new post in posts_controller. using rails 4. matter?

here controller

class postscontroller < applicationcontroller   def index      @posts = post.all        end    def show       @post = post.find(params[:id])   end    def new       @post = post.new   end    def create       @post = post.new(post_params)        if @post.save           redirect_to posts_path, :notice => "your post saved"       else           render ="new"       end   end    private   def post_params       params.require(:post).permit(:title, :content)   end    def edit       @post = post.find(params[:id])   end    def update       @post = post.find(params[:id])        if @post.update_attributes(post_params)           redirect_to posts_path, :notice => "your post has been updated"       else           render "edit"       end   end    def destroy    end end

here have in edit.html.erb

<h1>edit post</h1>  <%= form_for @post |f| %>     <p>         <%= f.label :title %> <br/>         <%= f.text_field :title %>     </p>     <p>         <%= f.label :content %> <br/>         <%= f.text_area :content %>     </p>     <p>         <%= f.submit "update post" %>     </p> <% end %>

why @post nil? tried doing "form_for post.new |f|" , works. have heard not approach

thanks in advance guys.

you have declared edit, update , destroy actions private. because of actions not getting called while rendering specific view, @post variable not set. hence, error. remove them private section , add them public.

postscontroller should below:

class postscontroller < applicationcontroller   def index      @posts = post.all        end    def show       @post = post.find(params[:id])   end    def new       @post = post.new   end    def create       @post = post.new(post_params)        if @post.save           redirect_to posts_path, :notice => "your post saved"       else           render ="new"       end   end    def edit       @post = post.find(params[:id])   end    def update       @post = post.find(params[:id])        if @post.update_attributes(post_params)           redirect_to posts_path, :notice => "your post has been updated"       else           render "edit"       end   end    def destroy      ## need below code deleting post      @post = post.find(params[:id])      @post.destroy      redirect_to roles_url    end    private   def post_params       params.require(:post).permit(:title, :content)   end end

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