Showing current category - rails - ruby-on-rails

Question

I need to show current category name on posts index.
Insted of "Jubotron" it should shows test (when test category is chosen)
My code
Controllers
def index
#categories = Category.all
cate = params[:cate]
if !cate.nil?
#blogs = Category.find(params[:cate]).blogs
else
#blogs = Blog.all
end
end
def show
#blog = Blog.find(params[:id])
end
def new
#blog = Blog.new
end
def create
#blog = Blog.create(blog_params)
if #blog.save
redirect_to #blog
else
render :new
end
end
def edit
#finds the blog id
#blog = Blog.find(params[:id])
end
def update
#blog = Blog.find(params[:id])
if #blog.update(blog_params)
redirect_to #blog
else
render :edit
end
end
def destroy
#blog = Blog.find(params[:id])
#blog.destroy
redirect_to :action => :index
end
private
def blog_params
params.require(:blog).permit(:title, :content, category_ids: [])
end
end
before_action :set_category, only: [:show, :edit, :update, :destroy]
# GET /categories
# GET /categories.json
def index
#categories = Category.all
end
# GET /categories/1
# GET /categories/1.json
def show
end
# GET /categories/new
def new
#category = Category.new
end
# GET /categories/1/edit
def edit
end
# POST /categories
# POST /categories.json
def create
#category = Category.new(category_params)
respond_to do |format|
if #category.save
format.html { redirect_to #category, notice: 'Category was successfully created.' }
format.json { render :show, status: :created, location: #category }
else
format.html { render :new }
format.json { render json: #category.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /categories/1
# PATCH/PUT /categories/1.json
def update
respond_to do |format|
if #category.update(category_params)
format.html { redirect_to #category, notice: 'Category was successfully updated.' }
format.json { render :show, status: :ok, location: #category }
else
format.html { render :edit }
format.json { render json: #category.errors, status: :unprocessable_entity }
end
end
end
# DELETE /categories/1
# DELETE /categories/1.json
def destroy
#category.destroy
respond_to do |format|
format.html { redirect_to categories_url, notice: 'Category was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_category
#category = Category.find(params[:id])
end
# Only allow a list of trusted parameters through.
def category_params
params.require(:category).permit(:category)
end
end
blogs/index.html.erb
<div class="row">
<div class="col-md-8">
<h1 style="text-align:center">Jumbotron</h1>
<%= #categories.each do |category| %>
<%= category.category %>
<% end %>
<div class="row">
<% #blogs.each do |blog| %>
<div class="col-md-6">
<div class="card mt-3">
<div class="card-body">
<h3><%= link_to blog.title, blog_path(blog.id) %></h3>
<p><%= blog.content %></p>
<%= link_to "Pokaż", blog_path(blog.id), class: 'btn btn-primary' %>
<br></br>
<div class="">
Kategoria:
<% blog.categories.each do |category| %>
<a><%= link_to category.category,blogs_path(:cate => category.id) %></a>
<% end %>
</div>
</div>
</div>
</div>
<% end %>
</div>
</div>
<div class="col-md-4">
<div class="card mt-3">
<div class="card-header">
Kategorie:
</div>
<div class="card-body">
<ul class="list-group">
<% #categories.each do |category| %>
<li class="list-group-item d-flex justify-content-between align-items-center">
<%= link_to category.category, blogs_path(:cate => category.id) %>
<span class="badge badge-primary badge-pill"><%= category.blogs.count %></span>
</li>
<% end %>
</ul>
</div>
</div>
</div>
</div>
</div>
and for example I can show category name in categories/show.htm.erb
but when I past it into Blogs index it gives me an error that category method is undefined.
<strong>Category:</strong>
<%= #category.category %>
</p> ```
Any ideas?

Answer 1

Your issue is where you are placing your 'Jumbotron' code. Currently, you're hardcoding the word 'Jumbotron' like this:
<h1 style="text-align:center">Jumbotron</h1>
You should move this inside the code where you are iterating over the categories:
<% #categories.each do |category| %>
<h1 style="text-align:center"><%= category.category %></h1>
<% end %>
Keep in mind, if you have more than one category, this is going to give you multiple <h1> tags; one for each category.

Answer 2

On the index page you are looping through the categories <% #categories.each do |category| %> thus you should use category.category and not #category.category inside the block