Created
November 13, 2017 21:57
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CountLoader
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| # Param-based count loader (for params and foreign keys). | |
| # | |
| # Example: | |
| # CountLoader.for(Category).load(category_id) | |
| # | |
| class CountLoader < GraphQL::Batch::Loader | |
| def initialize(model, param: :id, scope: nil) | |
| @model = model | |
| @param = param | |
| @scope = case scope | |
| when Symbol | |
| scope.to_proc | |
| when Hash | |
| ->(mod) { mod.where(scope) } | |
| when ActiveRecord::Relation | |
| ->(_) { scope } | |
| end | |
| end | |
| def perform(ids) | |
| scope = @scope ? @scope.call(@model) : @model | |
| scope.where(@param => ids).group(@param).count | |
| .each_pair { |record_id, count| fulfill(record_id.to_s, count) } | |
| ids.each { |id| | |
| id_ = id.to_s | |
| fulfill(id_, nil) unless fulfilled?(id_) | |
| } | |
| end | |
| end |
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