DOCSP-45356: i&h + code doc

snooty.toml

@@ -13,6 +13,7 @@ toc_landing_pages = [
     "/interact-data/specify-query",
     "/data-modeling",
     "/configuration",
+    "/issues-and-help"
 ]
 
 [constants]

source/code-documentation.txt

@@ -0,0 +1,352 @@
+.. _mongoid-code-documentation:
+
+==================
+Code Documentation
+==================
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
+
+Overview
+--------
+
+In this guide, you can learn about {+odm+}'s code documentation
+conventions. If you have a suggestion to improve the API documentation
+or introduce a new feature, you can use this guide to help you format
+your documentation.
+
+{+odm+} uses a variation of :github:`YARD <lsegal/yard>`, a {+language+}
+documentation tool, for its code documentation.
+
+.. _mongoid-code-documentation-structure:
+
+Structure
+---------
+
+- **Modules:** All class and module definitions must be preceded by
+  a documentation comment.
+
+  .. code-block:: ruby
+
+     # This is the documentation for the class. It's amazing
+     # what they do with corrugated cardboard these days.
+     class CardboardBox
+
+- **Methods:** All method definitions must be preceded by a
+  documentation comment. Use ``@param``, ``@yield``, and ``@return`` to
+  specify inputs and output. To learn more, see the
+  :ref:`mongoid-code-documentation-type-declaration` section.
+
+  .. code-block:: ruby
+
+     # Turn a person into whatever they'd like to be.
+     #
+     # @param [ Person ] person The human to transmogrify.
+     #
+     # @return [ Tiger ] The transmogrified result.
+     def transmogrify(person)
+
+- **Errors:** Use ``@raise`` to describe errors specific to the method.
+
+  .. code-block:: ruby
+
+     # @raise [ Errors::Validations ] If validation failed.
+     def validate!
+
+- **Private Methods:** Private methods must be documented unless they are
+  so brief and straightforward that it is obvious what they do. Note that,
+  for example, a method might be brief and straightforward but the type of
+  its parameter may not be obvious, in which case the parameter must be
+  appropriately documented.
+
+  .. code-block:: ruby
+
+     private
+
+     # Documentation is optional here.
+     def do_something_obvious
+
+- **API Private:** Classes and public methods which are not intended for
+  external usage must be marked ``@api private``. This macro does not
+  require a comment.
+
+  Note that, because {+odm+}'s modules are mixed into application classes,
+  ``private`` visibility of a method does not necessarily indicate its
+  status as an API private method.
+
+  .. code-block:: ruby
+
+     # This is an internal-only method.
+     #
+     # @api private
+     def dont_call_me_from_outside
+
+- **Notes and TODOs:** Use ``@note`` to explain caveats, edge cases,
+  and behavior which may surprise users. Use ``@todo`` to record
+  follow-ups and suggestions for future improvement.
+
+  .. code-block:: ruby
+
+     # Clear all stored data.
+     #
+     # @note This operation deletes data in the database.
+     # @todo Refactor this method for performance.
+     def erase_data!
+
+- **Deprecation:** Use the ``@deprecated`` macro to indicate deprecated
+  functionality. This macro does not require a comment.
+
+  .. code-block:: ruby
+
+     # This is how we did things back in the day.
+     #
+     # @deprecated
+     def the_old_way
+
+.. _mongoid-code-documentation-formatting:
+
+Formatting
+----------
+
+- **Line Wrapping:** Use double-space indent when wrapping lines of macros.
+  Do not indent line wraps in the description.
+
+  .. code-block:: ruby
+
+     # This is the description of the method. Line wraps in the description
+     # must not be indented.
+     #
+     # @return [ Symbol ] For macros, wraps must be double-space indented
+     #   on the second, third (and so on) lines.
+
+- **Whitespace:** Do not use leading/trailing empty comment lines,
+  or more than one consecutive empty comment line.
+
+  .. code-block:: ruby
+
+     # DO THIS:
+     # @return [ Symbol ] The return value
+     def my_method
+
+     # NOT THIS:
+     # @return [ Symbol ] The return value
+     #
+     def my_method
+
+     # NOT THIS:
+     # @param [ Symbol ] foo The input value
+     #
+     #
+     # @return [ Symbol ] The return value
+     def my_method(foo)
+
+.. _mongoid-code-documentation-type-declaration:
+
+Type Declaration
+----------------
+
+- **Type Unions:** Use pipe ``|`` to denote a union of allowed types.
+
+  .. code-block:: ruby
+
+     # @param [ Symbol | String ] name Either a Symbol or a String.
+
+- **Nested Types:** Use angle brackets ``< >`` to denote type nesting.
+
+  .. code-block:: ruby
+
+     # @param [ Array<Symbol> ] array An Array of symbols.
+
+- **Hash:** Use comma ``,`` to denote the key and value types.
+
+  .. code-block:: ruby
+
+     # @param [ Hash<Symbol, Integer> ] hash A Hash whose keys are Symbols,
+     #   and whose values are Integers.
+
+- **Array:** Use pipe ``|`` to denote a union of allowed types.
+
+  .. code-block:: ruby
+
+     # @param [ Array<Symbol | String> ] array An Array whose members must
+     #   be either Symbols or Strings.
+
+- **Array:** Use comma ``,`` to denote the types of each position in a tuple.
+
+  .. code-block:: ruby
+
+     # @return [ Array<Symbol, Integer, Integer> ] A 3-member Array whose first
+     #   element is a Symbol, and whose second and third elements are Integers.
+
+- **Array:** Use pipe ``|`` on the top level if the inner types cannot be
+  mixed within the Array.
+
+  .. code-block:: ruby
+
+     # @param [ Array<Symbol> | Array<Hash> ] array An Array containing only
+     #   Symbols, or an Array containing only Hashes. The Array may not contain
+     #   a mix of Symbols and Hashes.
+
+- **Nested Types:** For clarity, use square brackets ``[ ]`` to denote nested unions
+  when commas are also used.
+
+  .. code-block:: ruby
+
+     # @param [ Hash<Symbol, [ true | false ]> ] hash A Hash whose keys are Symbols,
+     #   and whose values are boolean values.
+
+- **Ruby Values:** Specific values may be denoted in the type using Ruby syntax.
+
+  .. code-block:: ruby
+
+     # @param [ :before | :after ] timing One of the Symbol values :before or :after.
+
+- **True, False, and Nil:** Use ``true``, ``false``, and ``nil`` rather than
+  ``TrueClass``, ``FalseClass``, and ``NilClass``. Do not use ``Boolean`` as a type
+  since it does not exist in Ruby.
+
+  .. code-block:: ruby
+
+     # DO THIS:
+     # @param [ true | false | nil ] bool A boolean or nil value.
+
+     # NOT THIS:
+     # @param [ TrueClass | FalseClass | NilClass ] bool A boolean or nil value.
+     # @param [ Boolean ] bool A boolean value.
+
+- **Return Self:** Specify return value ``self`` where a method returns ``self``.
+
+  .. code-block:: ruby
+
+     # @return [ self ] Returns the object itself.
+
+- **Splat Args:** Use three-dot ellipses ``...`` in the type declaration and
+  star ``*`` in the parameter name to denote a splat.
+
+  .. code-block:: ruby
+
+     # @param [ String... ] *items The list of items' names as Strings.
+     def buy_groceries(*items)
+
+- **Splat Args:** Do not use ``Array`` as the type unless each arg is actually an Array.
+
+  .. code-block:: ruby
+
+     # DO NOT DO THIS:
+     # @param [ Array<String> ] *items The list of items' names as Strings.
+     def buy_groceries(*items)
+
+     buy_groceries("Cheese", "Crackers", "Wine")
+
+     # DO THIS:
+     # @param [ Array<String>... ] *arrays One or more arrays containing name parts.
+     def set_people_names(*arrays)
+
+     set_people_names(["Harlan", "Sanders"], ["Jane", "K", ""Doe"], ["Jim", "Beam"])
+
+- **Splat Args:** Use comma ``,`` to denote positionality in a splat.
+
+  .. code-block:: ruby
+
+     # @param [ Symbol..., Hash ] *args A list of names, followed by a hash
+     #   as the optional last arg.
+     def say_hello(*args)
+
+- **Splat Args:** Specify type unions with square brackets ``[ ]``.
+
+  .. code-block:: ruby
+
+     # @param [ [ String | Symbol ]... ] *fields A splat of mixed Symbols and Strings.
+
+- **Keyword Arguments:** Following YARD conventions, use ``@param`` for keyword
+  arguments, and specify keyword argument names as symbols.
+
+  .. code-block:: ruby
+
+     # @param [ String ] query The search string
+     # @param [ Boolean ] :exact_match Whether to do an exact match
+     # @param [ Integer ] :results_per_page Number of results
+     def search(query, exact_match: false, results_per_page: 10)
+
+- **Hash Options:** Define hash key-value options with ``@option`` macro
+  immediately following the Hash ``@param``. Note ``@option`` parameter names
+  are symbols.
+
+  .. code-block:: ruby
+
+     # @param opts [ Hash<Symbol, Object> ] The optional hash argument or arguments.
+     # @option opts [ String | Array<String> ] :items The items as Strings to include.
+     # @option opts [ Integer ] :limit An Integer denoting the limit.
+     def buy_groceries(opts = {})
+
+- **Double Splats:** Use double-star ``**`` in the parameter name to denote a
+  keyword arg splat (double splat).  Note that type does not need declared on
+  the double-splat element,   as it is implicitly <Symbol, Object>. Instead,
+  define value types with ``@option``   macro below. Note ``@option`` parameter
+  names are symbols.
+
+  .. code-block:: ruby
+
+     # @param **kwargs The optional keyword argument or arguments.
+     # @option **kwargs [ String | Array<String> ] :items The items as Strings to include.
+     # @option **kwargs [ Integer ] :limit An Integer denoting the limit.
+     def buy_groceries(**kwargs)
+
+- **Blocks:** Use ``@yield`` to specify when the method yields to a block.
+
+  .. code-block:: ruby
+
+     # @yield [ Symbol, Symbol, Symbol ] Evaluate the guess of who did the crime.
+     #   Must take the person, location, and weapon used. Must return true or false.
+     def whodunit
+       yield(:mustard, :ballroom, :candlestick)
+     end
+
+- **Blocks:** If the method explicitly specifies a block argument, specify the block
+  argument using ``@param`` preceded by an ampersand ``&``, and also specify ``@yield``.
+  Note ``@yield`` must be used even when method calls ``block.call`` rather than
+  ``yield`` internally.
+
+  .. code-block:: ruby
+
+     # @param &block The block.
+     # @yield [ Symbol, Symbol, Symbol ] Evaluate the guess of who did the crime.
+     #   Must take the person, location, and weapon used. Must return true or false.
+     def whodunit(&block)
+       yield(:scarlet, :library, :rope)
+     end
+
+     # @param &block The block.
+     # @yield [ Symbol, Symbol, Symbol ] Evaluate the guess of who did the crime.
+     #   Must take the person, location, and weapon used. Must return true or false.
+     def whodunit(&block)
+       block.call(:plum, :kitchen, :pipe)
+     end
+
+- **Blocks:** Use ``@yieldparam`` and ``@yieldreturn`` instead of ``@yield`` where
+  beneficial for clarity.
+
+  .. code-block:: ruby
+
+     # @param &block The block.
+     # @yieldparam [ Symbol ] The person.
+     # @yieldparam [ Symbol ] The location.
+     # @yieldparam [ Symbol ] The weapon used.
+     # @yieldreturn [ true | false ] Whether the guess is correct.
+     def whodunit(&block)
+       yield(:peacock, :conservatory, :wrench)
+     end
+
+- **Proc Args:** Use ``@param`` (not ``@yield``) for proc arguments. The
+  inputs to the proc may be specified as subtypes.
+
+  .. code-block:: ruby
+
+     # @param [ Proc<Integer, Integer, Integer> ] my_proc Proc argument which must
+     #   take 3 integers and must return true or false whether the guess is valid.
+     def guess_three(my_proc)
+       my_proc.call(42, 7, 88)
+     end