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Using the create Method
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When you want to create an object and save it in one fell swoop, you can use the create method. Use it now to create another article: >> Article.create(:title => "RubyConf 2010", :body => "The annual RubyConf will take place in..", :published_at => '2010-05-19') => #<Article id: 4, title: "RubyConf 2010", body: "The annual RubyConf will take place in..", published_at: "2010-05-19 00:00:00", created_at: "2010-05-01 23:17:19", updated_at: "2010-05-01 23:17:19", excerpt: nil, location: nil> Instead of returning true or false, the create method returns the object it created in this case, an Article object. You re actually passing a hash of attributes to the create method. Although hashes are normally surrounded by curly braces, when a hash is the only argument to a Ruby method, the braces are optional. You can just as easily create the attributes hash first and then give that to create: >> attributes = { :title => "Rails Pub Nite", :body => "Rails Pub Nite is every 3rd Monday of each month, except in December.", :published_at => "2010-05-19"} => {:title=>"Rails Pub Nite", :body=>"Rails Pub Nite is every 3rd Monday of each month, except in December.", :published_at=>" 2010-05-19"} >>
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=> #<Article id: 5, title: "Rails Pub Nite", body: "Rails Pub Nite is every 3rd Monday of each month, e...", published_at: "2010-05-19 00:00:00", created_at: "2010-05-01 23:36:07", updated_at: "2010-05-01 23:36:07", excerpt: nil, location: nil> Let s see how many articles you ve created by doing a count: >> Article.count => 5 You re getting the hang of this now. To summarize, when you want to create a new object and save it manually, use the new constructor; when you want to create and save in one operation, use create. You ve already created five new records, which are plenty for now, so let s move on to the next step: finding records.
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Reading (Finding) Records
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Now that you have a few articles to play with, it s time to practice finding them. Every model class understands the find method. It s quite versatile and accepts a number of options that modify its behavior. Let s start with the basics. find is a class method. That means you use it on the model class rather than an object of that class, just as you did the new and create methods. Like new and create, a find operation, if successful, returns a new object. You can call find four ways: find(:id): Finds a single record by its unique id, or multiple records if :id is an array of ids find(:all) or its shortcut all: Finds all records in the table find(:first) or its shortcut first: Finds the first record find(:last) or its shortcut last: Finds the last record
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The following sections go through the different ways to call find and explain how to use each.
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Finding a Single Record Using an ID
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The :id, :first and :last options mostly return a single record. The :id option is specific; you use it when you re looking for a specific record and you know its unique id. If you give it a single id, it either returns the corresponding record (if there is one) or raises an exception (if there isn t). If you pass an array of ids like [4, 5] as the parameter, the method returns an array with all records that match the passed in ids. The :first option is a little more forgiving; it returns the first record in the table, or nil if the table is empty, as explained in the next section. You can find a single record using its unique id using find(:id). Here s how it works: >> Article.find(3) => #<Article id: 3, title: "Introduction to Active Record", body: "Active Record is Rails's default ORM..", published_at: "2010-05-01 04:00:00", created_at: "2010-05-01 23:15:37", updated_at: "2010-05-01 23:15:37", excerpt: nil, location: nil>
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