在何种情况下应当使用模式或模式。 ? 关于差异的信息在任何地方都有,但建议如何使用?
collection_select and select Rails helpers: Which one should I use? I can t see a difference in both ways. Both helpers take a collection and generates options tags inside a select tag. Is there a ...
在何种情况下应当使用模式或模式。 ? 关于差异的信息在任何地方都有,但建议如何使用?
where
,joins
,limit>
等。
find
on the other can executes the query and returns an array or an object (depending on whether you do find :all
or find :first
, so you can t chain stuff on the back of it.
你们能够通过条件,与他人一道寻找,但这样做就会被抹去。 您几乎不需要打电话<条码>。 页: 1 积极记录:Relation <>/code>在需要或需要打电话all
/时,即进入一个阵列,
>>>上<>上限/代码>。 这样做。
唯一一件事(find
)是当你有id(或阵列)并且想要装载相应的模型物体时的。
我们使用<条码>限定的条码>,任何时间都只产生一个结果,该页必须能够看得见。 E.g. /item/:id
。 我们拯救了诺福因特例,然后展示了404个错误页。
如果有可能出现一个缺失的项目,我们就使用<条码>,<>中>和<条码>。
collection_select and select Rails helpers: Which one should I use? I can t see a difference in both ways. Both helpers take a collection and generates options tags inside a select tag. Is there a ...
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