Arel limit Where if fields are present

I trying to create a select using Arel but I’m passing three parameters,
I
want to include the parameters only if they are different to nil or
blank.

Here is my method:

def self.advsearch(summary_description, specialties, place)

    User.joins(:experience,:summary,:information)
            .where(Information.arel_table[:business].eq(false))
            .where(Experience.arel_table[:description].matches("%#{summary_description}%")
          .or(Experience.arel_table[:description].matches("%#{summary_description.capitalize}%"))
          .or(Experience.arel_table[:job_title].matches("%#{summary_description}%"))
          .or(Experience.arel_table[:job_title].matches("%#{summary_description.capitalize}%"))
          .or(Summary.arel_table[:summary_description].matches("%#{summary_description}%"))
          .or(Summary.arel_table[:specialties].matches("%#{specialties}%"))
          .or(Information.arel_table[:address].matches("%#{place}%")))
          .order
          .uniq

end

I would like to do something like this:

def self.advsearch(summary_description, specialties, place)

    User.joins(:experience,:summary,:information)
            .where(Information.arel_table[:business].eq(false))
            .where(Experience.arel_table[:description].matches("%#{summary_description}%") 

unless !summary_description.nil?
.or(Experience.arel_table[:description].matches("%#{summary_description.capitalize}%"))
unless !summary_description.nil?
.or(Experience.arel_table[:job_title].matches("%#{summary_description}%"))
unless !summary_description.nil?
.or(Experience.arel_table[:job_title].matches("%#{summary_description.capitalize}%"))
unless !summary_description.nil?
.or(Summary.arel_table[:summary_description].matches("%#{summary_description}%"))
unless !summary_description.nil?
.or(Summary.arel_table[:specialties].matches("%#{specialties}%"))
unless !summary.nil?
.or(Information.arel_table[:address].matches("%#{place}%")))
unless !place.nil?
.order
.uniq
end

I trying to google something similar, but I didn’t find anything like
that.

Thanks in advance for your help.

On Tuesday, 18 December 2012 11:43:22 UTC-5, Jean wrote:

The pieces don’t all have to be chained together in one line, so you can
do
something like this:

condition = Arel::Nodes::False.new
condition =
condition.or(Experience.arel_table[:description].matches("%#{summary_description}%")
unless summary_description.blank?
…etc, just keep ORing on additional things to condition…
User.joins(…).where(condition)

BTW, you probably won’t actually need the repetitions with capitalize -
Arel implements the ‘matches’ operator with case-insensitive matching on
DBs that are case-sensitive by default (for instance, here for
PG:
https://github.com/rails/arel/blob/master/lib/arel/visitors/postgresql.rb#L7
).

Depending on the specific needs of your advanced search, you may also
want
to look into something like Sunspot (http://sunspot.github.com/), as it
handles some fairly complicated query parsing and allows for
multi-valued
fields (great for things like ‘specialties’).

–Matt J.