Class: SearchResolver

Inherits:
Object
  • Object
show all
Defined in:
backend/app/model/search_resolver.rb

Defined Under Namespace

Classes: PassThroughResolver, ResolveDefinition

Constant Summary collapse

MAX_BOOLEAN_QUERIES =

Theoretically someone might resolve a field that matches an unbounded number of records, and this could cause an OOM. Set an upper bound.

AppConfig[:max_boolean_queries]
MAX_RESOLVE_RESULTS = 
AppConfig[:max_page_size] * 2

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(resolve_definitions) ⇒ SearchResolver

Returns a new instance of SearchResolver.



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# File 'backend/app/model/search_resolver.rb', line 8

def initialize(resolve_definitions)
  @resolve_definitions = resolve_definitions.map {|s| ResolveDefinition.parse(s)}
end

Class Method Details

.add_custom_resolver(name, resolver_class) ⇒ Object 



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# File 'backend/app/model/search_resolver.rb', line 73

def self.add_custom_resolver(name, resolver_class)
  @custom_resolvers ||= {}
  @custom_resolvers[name] = resolver_class
end

.resolver_for(name) ⇒ Object 



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# File 'backend/app/model/search_resolver.rb', line 78

def self.resolver_for(name)
  if name
    clz = @custom_resolvers.fetch(name) {
      raise "Unrecognized search resolver: #{name}"
    }

    clz.new
  else
    PassThroughResolver.new
  end
end

Instance Method Details

#resolve(results) ⇒ Object 



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# File 'backend/app/model/search_resolver.rb', line 12

def resolve(results)
  @resolve_definitions.each do |resolve_def|
    source_field = resolve_def.source_field
    target_field = resolve_def.target_field
    custom_resolver = resolve_def.custom_resolver

    # Build up and run a Solr query to pull back the documents we'll be inlining
    search_terms = results['results'].map {|doc| doc[source_field]}.compact.flatten

    unless search_terms.empty?
      boolean_query = JSONModel.JSONModel(:boolean_query)
                      .from_hash('op' => 'OR',
                                 'subqueries' => search_terms.map {|term|
                                   JSONModel.JSONModel(:field_query)
                                     .from_hash('field' => target_field,
                                                'value' => term,
                                                'literal' => true)
                                     .to_hash
                                 })

      query = JSONModel.JSONModel(:advanced_query).from_hash('query' => boolean_query)

      if query['query']['subqueries'].size > MAX_BOOLEAN_QUERIES
        query['query']['subqueries'] = query['query']['subqueries'].take(MAX_BOOLEAN_QUERIES)
        Log.warn("Query subqueries hit MAX_BOOLEAN_QUERIES. Result set may be incomplete: #{query.to_hash.inspect}")
      end

      resolved_results = Solr.search(Solr::Query.create_advanced_search(query).pagination(1, MAX_RESOLVE_RESULTS))

      if resolved_results['total_hits'] > MAX_RESOLVE_RESULTS
        Log.warn("Resolve query hit MAX_RESOLVE_RESULTS. Result set may be incomplete: #{query.to_hash.inspect}")
      end

      # Insert the resolved records into our original result set.
      results['results'].each do |result|
        resolved = resolved_results['results'].map {|resolved|
          key = resolved[target_field]
          if ASUtils.wrap(result[source_field]).include?(key)
            {key => [SearchResolver.resolver_for(custom_resolver).resolve(resolved)]}
          end
        }.compact

        # Merge our entries into a single hash keyed on `key`
        result["_resolved_#{source_field}"] = resolved.reduce {|merged, elt| merged.merge(elt) {|key, coll1, coll2| coll1 + coll2}}
      end
    end
  end
end