121 lines
1.9 KiB
Ruby
121 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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class Trends::Query
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include Redisable
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include Enumerable
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attr_reader :prefix, :klass, :loaded
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alias loaded? loaded
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def initialize(prefix, klass)
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@prefix = prefix
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@klass = klass
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@records = []
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@loaded = false
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@allowed = false
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@limit = nil
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@offset = nil
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end
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def allowed!
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@allowed = true
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self
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end
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def allowed
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clone.allowed!
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end
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def in_locale!(value)
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@locale = value
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self
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end
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def in_locale(value)
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clone.in_locale!(value)
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end
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def offset!(value)
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@offset = value.to_i
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self
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end
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def offset(value)
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clone.offset!(value)
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end
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def limit!(value)
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@limit = value.to_i
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self
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end
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def limit(value)
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clone.limit!(value)
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end
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def records
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load
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@records
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end
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delegate :each, :empty?, :first, :last, :size, to: :records
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def to_ary
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records.dup
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end
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alias to_a to_ary
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def to_arel
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if ids_for_key.empty?
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klass.none
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else
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scope = klass.joins(sanitized_join_sql).reorder('x.ordering')
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scope = scope.offset(@offset) if @offset.present?
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scope = scope.limit(@limit) if @limit.present?
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scope
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end
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end
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private
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def key
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[@prefix, @allowed ? 'allowed' : 'all', @locale].compact.join(':')
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end
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def load
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unless loaded?
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@records = perform_queries
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@loaded = true
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end
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self
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end
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def ids_for_key
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@ids_for_key ||= redis.zrevrange(key, 0, -1).map(&:to_i)
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end
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def sanitized_join_sql
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ActiveRecord::Base.sanitize_sql_array(join_sql_array)
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end
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def join_sql_array
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[join_sql_query, ids_for_key]
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end
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def join_sql_query
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<<~SQL.squish
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JOIN unnest(array[?]) WITH ordinality AS x (id, ordering) ON #{klass.table_name}.id = x.id
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SQL
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end
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def perform_queries
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apply_scopes(to_arel).to_a
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end
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def apply_scopes(scope)
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scope
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end
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end
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