30 lines
743 B
Ruby
30 lines
743 B
Ruby
# references:
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# https://github.com/Shopify/graphql-batch/blob/master/examples/record_loader.rb
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module Loaders
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class Record < GraphQL::Batch::Loader
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def initialize(model, column: model.primary_key, where: nil)
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@model = model
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@column = column.to_s
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@column_type = model.type_for_attribute(@column)
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@where = where
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end
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def load(key)
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super(@column_type.cast(key))
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end
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def perform(keys)
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query(keys).each { |record| fulfill(record.public_send(@column), record) }
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keys.each { |key| fulfill(key, nil) unless fulfilled?(key) }
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end
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private
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def query(keys)
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scope = @model
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scope = scope.where(@where) if @where
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scope.where(@column => keys)
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end
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end
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end
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