Show virtual field in rails view - ruby-on-rails-4

I have been using the information here (http://ngauthier.com/2013/08/postgis-and-rails-a-simple-approach.html) so that the search results in my app can be shown based on proximity.
I am listing all tasks with their associated project information - a project can have multiple tasks.
I have the following AR query in my Project controller:
#results = Task.select('tasks.*') # .select('tasks.*') required for pg_search
.joins(:project => :user)
.includes(:project => :user)
.merge(Project.enabled_only.filter_by_location(#geo).search(params[:q]))
.order_results(sort)
In my Project model I have:
scope :distance_from, ->(latitude, longitude) {
select(%{
ST_Distance(
ST_GeographyFromText(
'SRID=4326;POINT(' || projects.longitude || ' ' || projects.latitude || ')'
),
ST_GeographyFromText('SRID=4326;POINT(%f %f)')
) AS distance
} % [longitude, latitude])
}
scope :near, ->(latitude, longitude, distance_in_meters = 1000) {
where(%{
ST_DWithin(
ST_GeographyFromText(
'SRID=4326;POINT(' || projects.longitude || ' ' || projects.latitude || ')'
),
ST_GeographyFromText('SRID=4326;POINT(%f %f)'),
%d
)
} % [longitude, latitude, distance_in_meters])
}
def self.filter_by_location(geo_location)
scoped = self.all
if geo_location.present?
scoped = scoped.distance_from(geo_location[:lat], geo_location[:lng])
scoped = scoped.near(geo_location[:lat], geo_location[:lng])
end
scoped
end
I then have the following in my Task model:
scope :distance_order, -> { order('distance') }
def self.order_results(sort)
# order scopes are appended
scoped = self.all.reorder('')
# check sql for search and distance fields
search_performed = scoped.to_sql.downcase.include?(' pg_search_rank')
distance_calculated = scoped.to_sql.downcase.include?(' distance')
if sort == 'rel'
# rel,dist
scoped = scoped.search_rank_order if search_performed
scoped = scoped.distance_order if distance_calculated
else
# dist,rel
scoped = scoped.distance_order if distance_calculated
scoped = scoped.search_rank_order if search_performed
end
scoped = scoped.name_order
scoped
end
This works fine for my app to sort results by proximity.
Distance is one of the columns in the sql select produced by the AR query, along with tasks.* and distance is being used correctly to sort results but I'm not sure how to display the distance in my view.
If I do <%= result.distance.to_s %>, it says distance is an undefined method. I don't have any joy with <%= result.project.distance.to_s %> either. Whereas <%= result.task_field %> and <%= result.project.project_field %> work fine.
I haven't seen too much use of both .joins() and .includes() at the same time in the RoR world but it did allow me to reduce the number of db calls whilst still producing the correct sql select statement...in my case anyway - that's why they are both used.
Am I missing something?
Is it the complexity of my AR query causing it?
Am I missing something in my Project or Task model to allow the virtual/calculated distance field to be display-able?
Thanks

The complex structure was replaced by a database view.
More details of how to do this can be found at this tutorial (http://pivotallabs.com/database-views-performance-rails/) and in one of my other SO questions here (Connecting database view with polymorphic model in rails).

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I hope it helps!