I’m developing a Ruby application that retrieves movie information. When the user hasn’t performed a search yet (when they first access the app), I want to implement fetching and displaying the popular horror movies. Currently, I can retrieve the movie information, but I’m unable to filter the data to get only the popular horror movies.
I can get the movie information, but I’m having trouble filtering the data to get only the popular horror movies. My issue is that I’m unable to filter the data to get only the popular horror movies.

app/views/movies/search.htmll.erb

 <h2 class="text-white">Today's popular horror movies</h2>
    <% movieinfo = JSON.parse((Tmdb::Movie.popular).to_json) %>
    <% i = 0 %>
    <div class="card-wrapper ">
        <% while i < movieinfo['table']['results'].count %>
            <div class="card">
                <div class="card-upperinfo">
                    <%if movieinfo['table']['results'][i]['table']['title'].present?%>
                        <h3><%= link_to movieinfo['table']['results'][i]['table']['title'], movie_path(movieinfo['table']['results'][i]['table']['id'])%></h3>
                    <%end%>

                    <% if movieinfo['table']['results'][i]['table']['release_date'].present? %>
                        <p class="release-date"><%= movieinfo['table']['results'][i]['table']['release_date'] %></p>
                    <%end%>
                </div>

                <% if movieinfo['table']['results'][i]['table']['poster_path'].present? %>
                    <p><%= image_tag 'https://image.tmdb.org/t/p/w1280' + movieinfo['table']['results'][i]['table']['poster_path'],class: "card-img", size: "200x300" %></p>
                <%end%>
            </div>

            <% i += 1%>
        <%end%>
    </div>
<%end%>
</div>

movies_controller.rb

class MoviesController < ApplicationController
  require 'themoviedb-api'
  Tmdb::Api.key(ENV['TMDB_API'])
  Tmdb::Api.language("ja")
  HORROR_GENRE_ID = 27

  def search
    if params[:looking_for]
      movie_title = params[:looking_for]
      url = "https://api.themoviedb.org/3/search/movie?api_key=#{ENV['TMDB_API']}&language=ja&query=" + URI.encode_www_form_component(movie_title)
    else
      url = "https://api.themoviedb.org/3/movie/popular?api_key=#{ENV['TMDB_API']}&language=ja"
      text = params[:looking_for]
      @movies = JSON.parse(Net::HTTP.get(URI.parse(url)))
    end
  end

  def show
    movie_id = params[:id]
    url = "https://api.themoviedb.org/3/movie/#{movie_id}?api_key=#{ENV['TMDB_API']}&language=ja"
    response = Net::HTTP.get(URI.parse(url))
    @movie = JSON.parse(response)
    @movie_history = MovieHistory.new  
  end
end
  

I referred to these articles.

How to fetch genre of a movie using its genre ids from tmdb api in android
How to get horror movies from TMDB?