Class: ForestLiana::LeaderboardStatGetter

Inherits:
StatGetter show all
Includes:
AggregationHelper
Defined in:
app/services/forest_liana/leaderboard_stat_getter.rb

Instance Attribute Summary

Attributes inherited from StatGetter

#record

Instance Method Summary collapse

Methods included from AggregationHelper

#aggregation_alias, #aggregation_sql, #resolve_field_path

Methods inherited from StatGetter

#get_resource, #validate_params

Methods inherited from BaseGetter

#get_collection, #get_resource, #includes_for_serialization

Constructor Details

#initialize(parent_model, params, forest_user) ⇒ LeaderboardStatGetter

Returns a new instance of LeaderboardStatGetter.



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# File 'app/services/forest_liana/leaderboard_stat_getter.rb', line 5

def initialize(parent_model, params, forest_user)
  @resource = parent_model
  @scoped_parent_model = get_scoped_model(parent_model, forest_user, params[:timezone])
  child_model = @scoped_parent_model.reflect_on_association(params[:relationshipFieldName]).klass
  @scoped_child_model = get_scoped_model(child_model, forest_user, params[:timezone])
  @label_field = params[:labelFieldName]
  @aggregate = params[:aggregator].downcase
  @aggregate_field = params[:aggregateFieldName]
  @limit = params[:limit]
  @group_by = "#{@scoped_parent_model.table_name}.#{@label_field}"
end

Instance Method Details

#get_scoped_model(model, forest_user, timezone) ⇒ Object 



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# File 'app/services/forest_liana/leaderboard_stat_getter.rb', line 34

def get_scoped_model(model, forest_user, timezone)
  scope_filters = ForestLiana::ScopeManager.get_scope(model.name, forest_user)

  return model.unscoped if scope_filters.blank?

  FiltersParser.new(scope_filters, model, timezone, @params).apply_filters
end

#perform ⇒ Object 



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# File 'app/services/forest_liana/leaderboard_stat_getter.rb', line 17

def perform
  includes = ForestLiana::QueryHelper.get_one_association_names_symbol(@scoped_child_model)

  alias_name = aggregation_alias(@aggregate, @aggregate_field)

  result = @scoped_child_model
    .joins(includes)
    .where({ @scoped_parent_model.name.downcase.to_sym => @scoped_parent_model })
    .group(@group_by)
    .order(Arel.sql("#{alias_name} DESC"))
    .limit(@limit)
    .pluck(@group_by, Arel.sql("#{aggregation_sql(@aggregate, @aggregate_field)} AS #{alias_name}"))
    .map { |key, value| { key: key, value: value } }

  @record = Model::Stat.new(value: result)
end