Ruby function search bar - ruby-on-rails

Question

I am having trouble with my search bar function, I want it to search through my recipes model attribute "ingredients". When I put this code in it doesnt give me any results only a blank recipes page after the search. Any help would be great.
I have the ingredients as text inside the recipe table.
this is inside the recipe index.html
<%= form_for "", url: recipes_path, role: "search", method: :get do %>
<%= text_field_tag :search, #search_term, placeholder: "Seach..." %>
<% end %>
this is the recipe controller
def index
#recipes = Recipe.all
# #recipes =Recipe.search(params[:search])
if params[:search]
#search_term = params[:search]
#recipes = #recipes.search_by(#search_term)
end
end
this is the recipes model function
def self.search_by(search_term)
where("LOWER(ingredients) LIKE :search_term OR LOWER(title) LIKE :search_term",
search_term: "%{search_term.downcase}%")
end
Also this is the command line when I do the search:
Started GET "/recipes?search=chicken" for 127.0.0.1 at 2021-07-09 07:52:57 -0400
Processing by RecipesController#index as HTML
Parameters: {"search"=>"chicken"}
Rendering layout layouts/application.html.erb
Rendering recipes/index.html.erb within layouts/application
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ? [["id", 3], ["LIMIT", 1]]
↳ app/views/recipes/index.html.erb:13
Recipe Load (0.2ms) SELECT "recipes".* FROM "recipes" WHERE (LOWER(ingredients) LIKE '%{search_term.downcase}%' OR LOWER(title) LIKE '%{search_term.downcase}%')
↳ app/views/recipes/index.html.erb:70
Rendered recipes/index.html.erb within layouts/application (Duration: 5.0ms | Allocations: 2463)
[Webpacker] Everything's up-to-date. Nothing to do
Rendered layouts/_alerts.html.erb (Duration: 0.1ms | Allocations: 41)
Rendered layout layouts/application.html.erb (Duration: 11.0ms | Allocations: 7781)
Completed 200 OK in 12ms (Views: 11.1ms | ActiveRecord: 0.3ms | Allocations: 8360)
Does anyone know why its not searching through the recipes ingredients? Thank you in advance.

Answer 1

The interpolation in search_by method is wrong.
You wrote "%{search_term.downcase}%" when the correct is "%#{search_term.downcase}%". Missed the #!
def self.search_by(search_term)
where("LOWER(ingredients) LIKE :search_term OR LOWER(title) LIKE :search_term",
search_term: "%#{search_term.downcase}%")
end