Mongoid query - Refine Search Implementation - ruby-on-rails

Question

I am working on refine search in Rails4 and Mongoid. This is my search params and form,
I built the query piece by piece:
if params[:procedure_id]
#blood_banks = BloodBank.where(:procedure_id => params[:procedure_id])
end
if params[:location_ids]
#blood_banks = BloodBank.where(:location_id.in => params[:location_ids])
end
...
if condition
end
If i need to search Procedure "Discectomy" in location "Hebbal" then i nned to define the if condition as follows,
if params[:procedure_id].present? && params[:location_id].present?
...
end
Then i need to do for all such combinations(4x3x2x1) of search, for my refine search!!!
Which is the best way to implement the same.
How do you achieve above situation???
I can't right all the possible if conditions, is their any shortcut method!!!
How to achieve below code:
if params[:fees].present?
if params[:fees] == "300"
#doctor_clinic = DoctorClinic.where( :consultation_fees => { '$lte' => params[:fees] }).map(&:doctor_id)
#doctors = Doctor.where(
{ :id.in => #doctor_clinic })
end
if params[:fees] == "500"
#doctor_clinic = DoctorClinic.where( :consultation_fees => { '$gte' => 300, '$lte' => params[:fees] }).map(&:doctor_id)
#doctors = Doctor.where(
{ :id.in => #doctor_clinic })
end
if params[:fees] == "1000"
#doctor_clinic = DoctorClinic.where( :consultation_fees => { '$gte' => 500, '$lte' => params[:fees] }).map(&:doctor_id)
#doctors = Doctor.where(
{ :id.in => #doctor_clinic })
end
if params[:fees] == "1001"
#doctor_clinic = DoctorClinic.where( :consultation_fees => { '$gte' => params[:fees] }).map(&:doctor_id)
#doctors = Doctor.where(
{ :id.in => #doctor_clinic })
end
end

Answer 1

You can do this:
conditions = {}
conditions.merge!(:procedure_id => params[:procedure_id]) if params[:procedure_id]
conditions.merge!(:location_id.in => params[:location_ids]) if params[:location_ids]
...
#blood_banks = BloodBank.where(conditions)
EDIT:
Regarding your last code, since you have no logic here (common idea for all values), you can use case:
condition = case params[:fees]
when "300"
{ '$lte' => 300 }
when "500"
{ '$gte' => 300, '$lte' => 500 }
when "1000"
{ '$gte' => 500, '$lte' => 1000 }
when "1001"
{ '$gte' => 1001 }
else
nil
end
if condition
#doctor_clinic = DoctorClinic.where( :consultation_fees => condition).map(&:doctor_id)
#doctors = Doctor.where({ :id.in => #doctor_clinic })
end