Class: ForestAdminDatasourceGraphqlHasura::Query::Aggregator

Inherits:
Object
  • Object
show all
Defined in:
lib/forest_admin_datasource_graphql_hasura/query/aggregator.rb

Overview

Runs Forest aggregations against Hasura on behalf of a collection.

Hasura exposes GROUP BY only through a nested <relation>_aggregate on a parent object, so a grouped aggregation goes through the parent table and is reduced here rather than by the database.

Constant Summary collapse

ForestException = 
ForestAdminDatasourceToolkit::Exceptions::ForestException
PARENT_PAGE =

Parent rows are reduced in Ruby, so they are paginated by PARENT_PAGE and capped at MAX_PARENT_ROWS: past the cap the chart fails with a clear error rather than silently charting a subset.

1000
MAX_PARENT_ROWS = 
10_000
DANGLING_KEYS_LIMIT =

At most this many distinct dangling foreign keys get a group of their own; beyond that the data is corrupt enough to deserve an error.

100

Instance Method Summary collapse

Constructor Details

#initialize(collection) ⇒ Aggregator

Returns a new instance of Aggregator.



23
24
25
 
# File 'lib/forest_admin_datasource_graphql_hasura/query/aggregator.rb', line 23

def initialize(collection)
  @collection = collection
end

Instance Method Details

#run(filter, aggregation, limit) ⇒ Object 



27
28
29
30
31
32
33
34
35
36
 
# File 'lib/forest_admin_datasource_graphql_hasura/query/aggregator.rb', line 27

def run(filter, aggregation, limit)
  validate(aggregation)
  @date_field = date_field?(aggregation)

  if aggregation.groups.nil? || aggregation.groups.empty?
    simple(filter, aggregation)
  else
    grouped(filter, aggregation, limit)
  end
end