Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You could do something like the following, though I expect there are gems that do this and more, and do it better:</p> <pre><code>module ArgCheck def type_check(label, arg, klass) raise_arg_err label + \ " (= #{arg}) is a #{arg.class} object, but should be be a #{klass} object" unless arg.is_a? klass end def range_check(label, val, min, max) raise_arg_err label + " (= #{val}) must be between #{min} and #{max}" unless val &gt;= min &amp;&amp; val &lt;= max end def min_check(label, val, min) puts "val = #{val}, min = #{min}" raise_arg_err label + " (= #{val}) must be &gt;= #{min}" unless val &gt;= min end def max_check(val, min) raise_arg_err label + " (= #{val}) must be &lt;= #{max}" unless val &lt;= max end # Possibly other checks here private def raise_arg_err(msg) raise ArgumentError, msg + "\n backtrace: #{caller_locations}" end end class Product include ArgCheck attr_accessor :quantity, :type, :price, :imported def initialize(quantity, type, price) # Check arguments min_check 'quantity', quantity, 0 type_check 'type', type, String type_check 'price', price, Float @quantity = quantity @type = type @price = price.round(2) end end product = Product.new(-1, :cat, 3) # =&gt; arg_check.rb:23:in `raise_arg_err': quantity (= -1) must be &gt;= 0 (ArgumentError) # backtrace: ["arg_check.rb:11:in `min_check'", "arg_check.rb:33:in `initialize'", \ # "arg_check.rb:43:in `new'", "arg_check.rb:43:in `&lt;main&gt;'"] product = Product.new(1, :cat, 3) # =&gt; arg_check.rb:26:in `raise_arg_err': type (= cat) is a Symbol object, \ # but should be be a String object (ArgumentError) # backtrace: ["arg_check.rb:3:in `type_check'", "arg_check.rb:34:in `initialize'", \ # "arg_check.rb:48:in `new'", "arg_check.rb:48:in `&lt;main&gt;'"] product = Product.new(1, "cat", 3) # =&gt; arg_check.rb:23:in `raise_arg_err': price (= 3) must be a Float object (ArgumentError) # backtrace: ["arg_check.rb:3:in `type_check'", "arg_check.rb:35:in `initialize'", \ # "arg_check.rb:53:in `new'", "arg_check.rb:53:in `&lt;main&gt;'"] product = Product.new(1, "cat", 3.00) # No exception raised </code></pre> <p>Note that, when run in irb, <a href="http://www.ruby-doc.org/core-2.0.0/Kernel.html#method-i-caller_locations" rel="nofollow"><code>Kernel#caller_locations</code></a> brings in a lot of stuff you don't want, that you won't get when run from the command line.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow to DRY up my ruby exceptions in initialize method?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCary Swoveland
    1. USCary Swoveland
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload