经过大量迭代,我设法创建了一个优化的查询。我把它放在一个 AditBatch 类中,还添加了延迟
class AuditBatch
############################################
## Init a batch update from a list of ids
## the aim is to avoid instantiations in controllers
## @param string class name (eq: 'Followup')
## @param int[] ids of object to update
## @param changet hash of changes {key1: newval, key2: newval}
############################################
def self.init_batch_creation(auditable_type, auditable_ids, changes)
obj = Object.const_get(auditable_type)
group = obj.where(id: auditable_ids)
AuditBatch.delay.batch_creation(group, changes, false)
end
############################################
## insert a long list of audits in one time
## @param group array array of auditable objects
## @param changet hash of changes {key1: newval, key2: newval}
############################################
def self.batch_creation(group, changes, delayed = true)
sql = 'INSERT INTO audits ("action", "audited_changes", "auditable_id", "auditable_type", "created_at", "version", "request_uuid")
VALUES '
total = group.size
group.each_with_index do |g, index|
parameters = 'json_build_object('
length = changes.size
i=1
changes.each do |key, val|
parameters += "'#{key}',"
parameters += "json_build_array("
parameters += "(SELECT ((audited_changes -> '#{key}')::json->>1) FROM audits WHERE auditable_id = #{g.id} order by id desc limit 1),"
parameters += val.is_a?(String) ? "'#{val.to_s}'" : val.to_s
parameters += ')'
parameters += ',' if i < length
i +=1
end
parameters += ')'
sql += "('update', #{parameters}, #{g.id}, '#{g.class.name}', '#{Time.now}', (SELECT max(version) FROM audits where auditable_id= #{g.id})+1, '#{SecureRandom.uuid}')"
sql += ", " if (index+1) < total
end
if delayed==true
AuditBatch.delay.execute_delayed_sql(sql)
else
ActiveRecord::Base.connection.execute(sql)
end
end
def self.execute_delayed_sql(sql)
ActiveRecord::Base.connection.execute(sql)
end
end