50 lines
1.3 KiB
Ruby
50 lines
1.3 KiB
Ruby
require 'active_support/lazy_load_hooks'
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require 'active_record/explain_registry'
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module ActiveRecord
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module Explain
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# Executes the block with the collect flag enabled. Queries are collected
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# asynchronously by the subscriber and returned.
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def collecting_queries_for_explain # :nodoc:
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ExplainRegistry.collect = true
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yield
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ExplainRegistry.queries
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ensure
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ExplainRegistry.reset
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end
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# Makes the adapter execute EXPLAIN for the tuples of queries and bindings.
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# Returns a formatted string ready to be logged.
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def exec_explain(queries) # :nodoc:
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str = queries.map do |sql, binds|
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msg = "EXPLAIN for: #{sql}"
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unless binds.empty?
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msg << " "
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msg << binds.map { |attr| render_bind(attr) }.inspect
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end
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msg << "\n"
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msg << connection.explain(sql, binds)
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end.join("\n")
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# Overriding inspect to be more human readable, especially in the console.
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def str.inspect
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self
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end
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str
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end
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private
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def render_bind(attr)
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value = if attr.type.binary? && attr.value
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"<#{attr.value_for_database.to_s.bytesize} bytes of binary data>"
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else
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connection.type_cast(attr.value_for_database)
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end
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[attr.name, value]
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end
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end
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end
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