Class: ForestAdminDatasourceGraphqlHasura::Introspection::PolymorphismDetector

Inherits:
Object
  • Object
show all
Defined in:
lib/forest_admin_datasource_graphql_hasura/introspection/polymorphism_detector.rb

Overview

Recognises Rails polymorphic belongs_to associations among introspected tables, from a <base>_type/<base>_id column pair backed by one Hasura relationship per target, or from the polymorphic_relations configuration when the metadata API is unreachable.

Instance Method Summary collapse

Constructor Details

#initialize(configuration) ⇒ PolymorphismDetector

Returns a new instance of PolymorphismDetector.



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# File 'lib/forest_admin_datasource_graphql_hasura/introspection/polymorphism_detector.rb', line 10

def initialize(configuration)
  @configuration = configuration
end

Instance Method Details

#detect(tables) ⇒ Object

Fills polymorphics on each table and removes the per-target object relationships it absorbs.



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# File 'lib/forest_admin_datasource_graphql_hasura/introspection/polymorphism_detector.rb', line 16

def detect(tables)
  # Relationships reference the GraphQL type name; the merge order makes
  # the type interpretation win when it collides with another table's
  # root field name (crossed custom_root_fields renames).
  tables_by_name = tables.to_h { |table| [table.name, table] }
                         .merge(tables.to_h { |table| [table.type_name, table] })

  tables.each do |table|
    bases_of(table).each { |base| absorb(table, base, tables_by_name) }
  end
end