add missing collection.reload documentation [ci skip]

activerecord/lib/active_record/associations.rb

@@ -1192,8 +1192,8 @@ module ActiveRecord
         # <tt>has_many :clients</tt> would add among others <tt>clients.empty?</tt>.
         #
         # [collection]
-        #   Returns an array of all the associated objects.
-        #   An empty array is returned if none are found.
+        #   Returns a Relation of all the associated objects.
+        #   An empty Relation is returned if none are found.
         # [collection<<(object, ...)]
         #   Adds one or more objects to the collection by setting their foreign keys to the collection's primary key.
         #   Note that this operation instantly fires update SQL without waiting for the save or update call on the
@@ -1250,6 +1250,9 @@ module ActiveRecord
         # [collection.create!(attributes = {})]
         #   Does the same as <tt>collection.create</tt>, but raises ActiveRecord::RecordInvalid
         #   if the record is invalid.
+        # [collection.reload]
+        #   Returns a Relation of all of the associated objects, forcing a database read.
+        #   An empty Relation is returned if none are found.
         #
         # === Example
         #
@@ -1269,6 +1272,7 @@ module ActiveRecord
         # * <tt>Firm#clients.build</tt> (similar to <tt>Client.new("firm_id" => id)</tt>)
         # * <tt>Firm#clients.create</tt> (similar to <tt>c = Client.new("firm_id" => id); c.save; c</tt>)
         # * <tt>Firm#clients.create!</tt> (similar to <tt>c = Client.new("firm_id" => id); c.save!</tt>)
+        # * <tt>Firm#clients.reload</tt>
         # The declaration can also include an +options+ hash to specialize the behavior of the association.
         #
         # === Scopes
@@ -1712,8 +1716,8 @@ module ActiveRecord
         # <tt>has_and_belongs_to_many :categories</tt> would add among others <tt>categories.empty?</tt>.
         #
         # [collection]
-        #   Returns an array of all the associated objects.
-        #   An empty array is returned if none are found.
+        #   Returns a Relation of all the associated objects.
+        #   An empty Relation is returned if none are found.
         # [collection<<(object, ...)]
         #   Adds one or more objects to the collection by creating associations in the join table
         #   (<tt>collection.push</tt> and <tt>collection.concat</tt> are aliases to this method).
@@ -1751,6 +1755,9 @@ module ActiveRecord
         #   Returns a new object of the collection type that has been instantiated
         #   with +attributes+, linked to this object through the join table, and that has already been
         #   saved (if it passed the validation).
+        # [collection.reload]
+        #   Returns a Relation of all of the associated objects, forcing a database read.
+        #   An empty Relation is returned if none are found.
         #
         # === Example
         #
@@ -1769,6 +1776,7 @@ module ActiveRecord
         # * <tt>Developer#projects.exists?(...)</tt>
         # * <tt>Developer#projects.build</tt> (similar to <tt>Project.new("developer_id" => id)</tt>)
         # * <tt>Developer#projects.create</tt> (similar to <tt>c = Project.new("developer_id" => id); c.save; c</tt>)
+        # * <tt>Developer#projects.reload</tt>
         # The declaration may include an +options+ hash to specialize the behavior of the association.
         #
         # === Scopes

guides/source/association_basics.md

@@ -829,6 +829,7 @@ author=
 build_author
 create_author
 create_author!
+reload_author
 ```
 
 NOTE: When initializing a new `has_one` or `belongs_to` association you must use the `build_` prefix to build the association, rather than the `association.build` method that would be used for `has_many` or `has_and_belongs_to_many` associations. To create one, use the `create_` prefix.
@@ -1180,6 +1181,7 @@ account=
 build_account
 create_account
 create_account!
+reload_account
 ```
 
 NOTE: When initializing a new `has_one` or `belongs_to` association you must use the `build_` prefix to build the association, rather than the `association.build` method that would be used for `has_many` or `has_and_belongs_to_many` associations. To create one, use the `create_` prefix.
@@ -1445,6 +1447,7 @@ When you declare a `has_many` association, the declaring class automatically gai
 * `collection.build(attributes = {}, ...)`
 * `collection.create(attributes = {})`
 * `collection.create!(attributes = {})`
+* `collection.reload`
 
 In all of these methods, `collection` is replaced with the symbol passed as the first argument to `has_many`, and `collection_singular` is replaced with the singularized version of that symbol. For example, given the declaration:
 
@@ -1473,11 +1476,12 @@ books.exists?(...)
 books.build(attributes = {}, ...)
 books.create(attributes = {})
 books.create!(attributes = {})
+books.reload
 ```
 
 ##### `collection`
 
-The `collection` method returns an array of all of the associated objects. If there are no associated objects, it returns an empty array.
+The `collection` method returns a Relation of all of the associated objects. If there are no associated objects, it returns an empty Relation.
 
 ```ruby
 @books = @author.books
@@ -1611,6 +1615,14 @@ The `collection.create` method returns a single or array of new objects of the a
 
 Does the same as `collection.create` above, but raises `ActiveRecord::RecordInvalid` if the record is invalid.
 
+##### `collection.reload`
+
+The `collection.reload` method returns a Relation of all of the associated objects, forcing a database read. If there are no associated objects, it returns an empty Relation.
+
+```ruby
+@books = @author.books.reload
+```
+
 #### Options for `has_many`
 
 While Rails uses intelligent defaults that will work well in most situations, there may be times when you want to customize the behavior of the `has_many` association reference. Such customizations can easily be accomplished by passing options when you create the association. For example, this association uses two such options:
@@ -1967,6 +1979,7 @@ When you declare a `has_and_belongs_to_many` association, the declaring class au
 * `collection.build(attributes = {})`
 * `collection.create(attributes = {})`
 * `collection.create!(attributes = {})`
+* `collection.reload`
 
 In all of these methods, `collection` is replaced with the symbol passed as the first argument to `has_and_belongs_to_many`, and `collection_singular` is replaced with the singularized version of that symbol. For example, given the declaration:
 
@@ -1995,6 +2008,7 @@ assemblies.exists?(...)
 assemblies.build(attributes = {}, ...)
 assemblies.create(attributes = {})
 assemblies.create!(attributes = {})
+assemblies.reload
 ```
 
 ##### Additional Column Methods
@@ -2006,7 +2020,7 @@ WARNING: The use of extra attributes on the join table in a `has_and_belongs_to_
 
 ##### `collection`
 
-The `collection` method returns an array of all of the associated objects. If there are no associated objects, it returns an empty array.
+The `collection` method returns a Relation of all of the associated objects. If there are no associated objects, it returns an empty Relation.
 
 ```ruby
 @assemblies = @part.assemblies
@@ -2118,6 +2132,14 @@ The `collection.create` method returns a new object of the associated type. This
 
 Does the same as `collection.create`, but raises `ActiveRecord::RecordInvalid` if the record is invalid.
 
+##### `collection.reload`
+
+The `collection.reload` method returns a Relation of all of the associated objects, forcing a database read. If there are no associated objects, it returns an empty Relation.
+
+```ruby
+@assemblies = @part.assemblies.reload
+```
+
 #### Options for `has_and_belongs_to_many`
 
 While Rails uses intelligent defaults that will work well in most situations, there may be times when you want to customize the behavior of the `has_and_belongs_to_many` association reference. Such customizations can easily be accomplished by passing options when you create the association. For example, this association uses two such options: