I saw binds as argument in lots of methods, but without any documentation.
def find_by_sql(sql, binds = [], preparable: nil, &block)
result_set = connection.select_all(sanitize_sql(sql), "#{name} Load", binds, preparable: preparable)
column_types = result_set.column_types.dup
columns_hash.each_key { |k| column_types.delete k }
message_bus = ActiveSupport::Notifications.instrumenter
payload = {
record_count: result_set.length,
class_name: name
}
message_bus.instrument("instantiation.active_record", payload) do
result_set.map { |record| instantiate(record, column_types, &block) }
end
end
binds
mean? When your SQL contain question marks ?
the binds are used to replace these marks. For example if you have a query like this: SELECT * from posts where id = 3
you can write in Ruby:
Post.find_by_sql(["SELECT * from posts where id = ?", 3])
We have binded the ?
with the value 3
. If we have more ?
they will be binded with the binds array in that order. If there are not ?
in the SQL string binds are ignored.
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