how can I write LIKE statement in rails for mongodb

Question

The search is working when I use whole words but I want also partial words to be recognized.

I have the form here:

= form_tag({}, method: :get) do
      = text_field_tag :query, query, class: 'form-input search__input', placeholder: t('.placeholder')
      - if query.nil?
        %span.search__icon.fa.fa-search{ aria: { hidden: 'true' } }
      - else
        = link_to more_path do
          %span.search__icon.text-success.fa.fa-times{ aria: { hidden: 'true' } }

controller:

  def set_query
    @query = params[:query]
  end


  def set_documents
    @documents = @folder ? @folder.documents : current_user.documents
    @documents = (params[:query] ? @documents.where(
      :$text => {:$search => params[:query]}
    ) : @documents).page(params[:page])
  end

I tried to add this in the controller to make it work as I want it:

@documents = Document.where('name LIKE ?', "%#{@query}%")
      end

but then I get the error:

wrong number of arguments (given 2, expected 1)

How should I write this so that the search can work not only for whole words but also for partial words written.

Answer 1

If you're using mongoid, you can use regular expressions in your where :

Document.where(name: /.*(#{@query})+.*/i)

Or try any_of :

Document.any_of(name: /.*(#{Regexp.escape(@query)}).*/i)

So your set_documents method should look something like:

def set_documents
  @documents = @folder ? @folder.documents : current_user.documents
  @documents = (params[:query] ? @documents.where(
    name: /.*#{@query}.*/i
  ) : @documents).page(params[:page])
end

Answer 2

Mongoid support regular expression in queries

User.where(:name => /.*anand.*/i )

Here i for non case sensitive matching.

or

search_term = params[:search_term]
User.where({:name => Regexp.new ("/.*"+search_term+".*/") })

you can write any regular expression in reg object