Rails 基于两个字段查找或创建 [英] Rails find or create based on two fields

问题描述

我有一个场地模型，我想做这个

I have a venue model and i want to do this

Venue.find_or_create_by_

但我只想创建一个新场地，如果名称和日期相同的场地不存在

but i only want a new venue to be created if one with the same name and date do not already exist

例如

=> Venue(id: integer, location: string, showdate: datetime, created_at: datetime, updated_at: datetime)

场地是唯一的，如果地点和演出日期不存在于数据库中，则需要创建场地

A venue is unique and needs to be created if the location and the showdate are not present in the db

推荐答案

您可以使用 _and_ 将列链接在一​​起.这应该可以解决问题:

You can chain columns together by using _and_. This should do the trick:

Venue.find_or_create_by_location_and_showdate(location, showdate)

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