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