Question

new.html.erb

<h3>Add post</h3>

<%= form_tag :controller=>'posts', :action=>'create' do %>
    <%= label :q, :Title %>
    <%= text_field :data, :title, :class => :addtextsize %><br/>
    <%= label :q, :Content %>
    <%= text_area  :data, :content, :rows=>10 , :class => :addtextarea %><br/>
    <%= label :q, :Category %>
    <%= select :data, :category_id, @categories_select %><br/>
    <%= label :q, :Tags %>
    <%= text_field :data, :tags, :class => :addtextsize %><br/>
    <%= label :q, :Submit %>
    <%= submit_tag "Add Post" %>
<% end %>

create action of PostController.rb

def create
    @categories_select = Category.all.collect {|c| [ c.category_name, c.id ] }
    @addpost = Post.new params[:data]
    if @addpost.save
        flash[:notice] = "Post has been saved successfully."
        redirect_to posts_path
    else
        flash[:notice] = "Post can not be saved, please enter information."
        render :new
        #redirect_to new_post_path
    end
end

Getting users.id i need to insert it into posts table. How can i do it ?

posts table

                                   Table "public.posts"
   Column    |          Type          |                     Modifiers                      
-------------+------------------------+----------------------------------------------------
 id          | integer                | not null default nextval('posts_id_seq'::regclass)
 title       | character varying(100) | not null
 content     | character varying(500) | not null
 created_at  | date                   | 
 updated_at  | date                   | 
 tags        | character varying(55)  | not null default '50'::character varying
 category_id | integer                | not null default 1
 user_id     | integer                | 
Indexes:
    "posts_pkey" PRIMARY KEY, btree (id)

Answer 1

Devise provides a helper method called current_user which you can use to get the authenticated user. So, you could put a hidden text input in your form, like this:

<%= hidden_field_tag :user_id, current_user.id %>

This will allow it to be passed into your collection of params.

The other option would be to manually add it in the create method:

def create
    @categories_select = Category.all.collect {|c| [ c.category_name, c.id ] }
    @addpost = Post.new params[:data]
    @addpost.user_id = current_user.id
    if @addpost.save
        flash[:notice] = "Post has been saved successfully."
        redirect_to posts_path
    else
        flash[:notice] = "Post can not be saved, please enter information."
        render :new
        #redirect_to new_post_path
    end
end