blocks|key|693578|text|User.reflect_on_all_associations|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|693579|这将返回一个关联数组，如下所示：|unstyled|693580|#<ActiveRecord::Reflection::AssociationReflection:0x00000105575548+@macro=:has_many,+@name=:posts,+@options={},+@active_record=User(id:+integer,+login:+string),+@collection=false>|693581|示例代码：|693582|reflections+=+User.reflect_on_all_associations
reflections.each+do+%7Creflection%7C
++puts+":#{reflection.macro}+=>+:#{reflection.name}"
end|693583|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|M|3|-4|5|F|7|T|8|@]|9|@]|A|$]]]|N|$]]

<pre><code>User.reflect_on_all_associations
</code></pre>

This will return an array of associations similar to this:

<pre><code>#&lt;ActiveRecord::Reflection::AssociationReflection:0x00000105575548 @macro=:has_many, @name=:posts, @options={}, @active_record=User(id: integer, login: string), @collection=false&gt;
</code></pre>

Sample code:

<pre><code>reflections = User.reflect_on_all_associations
reflections.each do |reflection|
 puts ":#{reflection.macro} =&gt; :#{reflection.name}"
end
</code></pre>

blocks|key|693609|text|因为我是一个新用户，所以我无法澄清/回复别人的帖子。我会注意到，在检查关联中的任何更改之前，您需要重新加载rails控制台。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|693610|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Because I'm a new user, I am unable to clarify/reply to other's posts. I'll note that you need to reload the rails console before checking any changes in associations.

blocks|key|693637|text|将这个添加到/lib下的某个位置。例如clone_deep.rb。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|693638|module+CloneDeep
++def+clone_deep
++++kopy+=+clone
++++self.class.reflect_on_all_associations.each+do+%7Cassociation%7C
++++++next+if+association.macro+==+:belongs_to
++++++cloned_object+=+case+association.macro
++++++++++++++++++++++++when+:has_many
++++++++++++++++++++++++++self.send(association.name).collect+{+%7Citem%7C+item.clone_deep+}
++++++++++++++++++++++++when+:has_one
++++++++++++++++++++++++++self.send(association.name)+&&+self.send(association.name).clone_deep
++++++++++++++++++++++++else
++++++++++++++++++++++++++clone
++++++++++++++++++++++end
++++++kopy.send("#{association.name}=",+cloned_object)
++++end
++++return+kopy
++end
end|code-block|syntax|javascript|693639|在config/initializers/文件夹下创建新的初始化器。在此文件中粘贴|693640|ActiveRecord::Base.send(:include,+CloneDeep)|693641|现在，您可以克隆具有所有has_one和hos_many关联的模型。|693642|cloned_person+=+person.clone_deep
cloned_person.save|693643|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Add this some where is under /lib. For example clone_deep.rb.

<pre><code>module CloneDeep
 def clone_deep
 kopy = clone
 self.class.reflect_on_all_associations.each do |association|
 next if association.macro == :belongs_to
 cloned_object = case association.macro
 when :has_many
 self.send(association.name).collect { |item| item.clone_deep }
 when :has_one
 self.send(association.name) &amp;&amp; self.send(association.name).clone_deep
 else
 clone
 end
 kopy.send("#{association.name}=", cloned_object)
 end
 return kopy
 end
end
</code></pre>

Create new initializer under config/initializers/ folder. Inside this file paste

<pre><code>ActiveRecord::Base.send(:include, CloneDeep)
</code></pre>

Now you be able to clone model with all it's has_one and hos_many associations.

<pre><code>cloned_person = person.clone_deep
cloned_person.save
</code></pre>

blocks|key|909748|text|您可以针对任何特定情况执行此操作:-+user+=+User.reflect_on_association(:user_profile)和user.macro|type|unstyled|depth|inlineStyleRanges|entityRanges|data|909749|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can do this for any particular :- 
user = User.reflect_on_association(:user_profile)
and
user.macro

blocks|key|909766|text|使用gem+pry-rails，您将能够访问模型、其列和关系。将其包含在您的Gemfile中，然后运行bundle。当您在pry控制台中时，可以使用命令show-models。您将获得有关所有模型的信息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|909767|您还可以运行show-model+(Model_Name)来获取有关特定模型的信息|909768|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/rweng/pry-rails^0|12|7|1F|6|24|B|6|9|0|0|6|N|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Using the gem <a href="https://github.com/rweng/pry-rails" rel="noreferrer">pry-rails</a> you will be able to access the model, its columns and relationships. Include it in your <code>Gemfile</code>, then you run <code>bundle</code>. You can use the command <code>show-models</code> when you are in your pry console. and you will get the information about all your models. 

You can also run <code>show-model (Model_Name)</code> to get information about a specific model

I have a model in my Rails application - User. I want all the associations to be listed in rails console, along with the type of association(1-1, 1-many).

Get rails associations from console

我的Rails应用程序中有一个模型- User。我希望在rails控制台中列出所有的关联，以及关联的类型(1-1，1-多)。

问从控制台获取rails关联
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问从控制台获取rails关联EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问从控制台获取rails关联
EN