9aa59f9d4a
The Preloader relies on other objects to bind the retrieved records to their parents. When executed across a hash, it assumes that the results of `preloaded_records` is the appropriate set of records to pass in to the next layer. Filtering based on the reflection properties in `preloaded_records` allows us to avoid excessive preloading in the instance where we are loading across a `has_one` association distinguished by an order (e.g. "last comment" or similar), by dropping these records before they are returned to the Preloader. In this situation, we avoid potentially very long key lists in generated queries and the consequential AR object instantiations. This is mostly relevant if the underlying linked set has relatively many records, because this is effectively a multiplier on the number of records returned on the far side of the preload. Unfortunately, avoiding the over-retrieval of the `has_one` association seems to require substantial changes to the preloader design, and probably adaptor-specific logic -- it is a top-by-group problem.
249 lines
11 KiB
Ruby
249 lines
11 KiB
Ruby
# frozen_string_literal: true
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class Author < ActiveRecord::Base
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has_many :posts
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has_many :serialized_posts
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has_one :post
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has_many :very_special_comments, through: :posts
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has_many :posts_with_comments, -> { includes(:comments) }, class_name: "Post"
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has_many :popular_grouped_posts, -> { includes(:comments).group("type").having("SUM(comments_count) > 1").select("type") }, class_name: "Post"
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has_many :posts_with_comments_sorted_by_comment_id, -> { includes(:comments).order("comments.id") }, class_name: "Post"
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has_many :posts_sorted_by_id, -> { order(:id) }, class_name: "Post"
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has_many :posts_sorted_by_id_limited, -> { order("posts.id").limit(1) }, class_name: "Post"
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has_many :posts_with_categories, -> { includes(:categories) }, class_name: "Post"
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has_many :posts_with_comments_and_categories, -> { includes(:comments, :categories).order("posts.id") }, class_name: "Post"
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has_many :posts_with_special_categorizations, class_name: "PostWithSpecialCategorization"
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has_one :post_about_thinking, -> { where("posts.title like '%thinking%'") }, class_name: "Post"
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has_one :post_about_thinking_with_last_comment, -> { where("posts.title like '%thinking%'").includes(:last_comment) }, class_name: "Post"
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has_many :comments, through: :posts do
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def ratings
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Rating.joins(:comment).merge(self)
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end
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end
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has_many :comments_containing_the_letter_e, through: :posts, source: :comments
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has_many :comments_with_order_and_conditions, -> { order("comments.body").where("comments.body like 'Thank%'") }, through: :posts, source: :comments
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has_many :comments_with_include, -> { includes(:post).where(posts: { type: "Post" }) }, through: :posts, source: :comments
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has_many :comments_for_first_author, -> { for_first_author }, through: :posts, source: :comments
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has_many :first_posts
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has_many :comments_on_first_posts, -> { order("posts.id desc, comments.id asc") }, through: :first_posts, source: :comments
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has_one :first_post
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has_one :comment_on_first_post, -> { order("posts.id desc, comments.id asc") }, through: :first_post, source: :comments
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has_many :thinking_posts, -> { where(title: "So I was thinking") }, dependent: :delete_all, class_name: "Post"
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has_many :welcome_posts, -> { where(title: "Welcome to the weblog") }, class_name: "Post"
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has_many :welcome_posts_with_one_comment,
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-> { where(title: "Welcome to the weblog").where("comments_count = ?", 1) },
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class_name: "Post"
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has_many :welcome_posts_with_comments,
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-> { where(title: "Welcome to the weblog").where(Post.arel_table[:comments_count].gt(0)) },
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class_name: "Post"
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has_many :comments_desc, -> { order("comments.id DESC") }, through: :posts_sorted_by_id, source: :comments
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has_many :unordered_comments, -> { unscope(:order).distinct }, through: :posts_sorted_by_id_limited, source: :comments
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has_many :funky_comments, through: :posts, source: :comments
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has_many :ordered_uniq_comments, -> { distinct.order("comments.id") }, through: :posts, source: :comments
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has_many :ordered_uniq_comments_desc, -> { distinct.order("comments.id DESC") }, through: :posts, source: :comments
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has_many :readonly_comments, -> { readonly }, through: :posts, source: :comments
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has_many :special_posts
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has_many :special_post_comments, through: :special_posts, source: :comments
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has_many :special_posts_with_default_scope, class_name: "SpecialPostWithDefaultScope"
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has_many :sti_posts, class_name: "StiPost"
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has_many :sti_post_comments, through: :sti_posts, source: :comments
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has_many :special_nonexistent_posts, -> { where("posts.body = 'nonexistent'") }, class_name: "SpecialPost"
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has_many :special_nonexistent_post_comments, -> { where("comments.post_id" => 0) }, through: :special_nonexistent_posts, source: :comments
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has_many :nonexistent_comments, through: :posts
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has_many :hello_posts, -> { where "posts.body = 'hello'" }, class_name: "Post"
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has_many :hello_post_comments, through: :hello_posts, source: :comments
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has_many :posts_with_no_comments, -> { where("comments.id" => nil).includes(:comments) }, class_name: "Post"
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has_many :hello_posts_with_hash_conditions, -> { where(body: "hello") }, class_name: "Post"
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has_many :hello_post_comments_with_hash_conditions, through: :hello_posts_with_hash_conditions, source: :comments
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has_many :other_posts, class_name: "Post"
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has_many :posts_with_callbacks, class_name: "Post", before_add: :log_before_adding,
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after_add: :log_after_adding,
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before_remove: :log_before_removing,
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after_remove: :log_after_removing
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has_many :posts_with_thrown_callbacks, class_name: "Post", before_add: :throw_abort,
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after_add: :ensure_not_called,
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before_remove: :throw_abort,
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after_remove: :ensure_not_called
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has_many :posts_with_proc_callbacks, class_name: "Post",
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before_add: Proc.new { |o, r| o.post_log << "before_adding#{r.id || '<new>'}" },
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after_add: Proc.new { |o, r| o.post_log << "after_adding#{r.id || '<new>'}" },
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before_remove: Proc.new { |o, r| o.post_log << "before_removing#{r.id}" },
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after_remove: Proc.new { |o, r| o.post_log << "after_removing#{r.id}" }
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has_many :posts_with_multiple_callbacks, class_name: "Post",
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before_add: [:log_before_adding, Proc.new { |o, r| o.post_log << "before_adding_proc#{r.id || '<new>'}" }],
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after_add: [:log_after_adding, Proc.new { |o, r| o.post_log << "after_adding_proc#{r.id || '<new>'}" }]
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has_many :unchangeable_posts, class_name: "Post", before_add: :raise_exception, after_add: :log_after_adding
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has_many :categorizations, -> { }
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has_many :categories, through: :categorizations
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has_many :named_categories, through: :categorizations
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has_many :special_categorizations
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has_many :special_categories, through: :special_categorizations, source: :category
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has_one :special_category, through: :special_categorizations, source: :category
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has_many :special_categories_with_conditions, -> { where(categorizations: { special: true }) }, through: :categorizations, source: :category
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has_many :nonspecial_categories_with_conditions, -> { where(categorizations: { special: false }) }, through: :categorizations, source: :category
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has_many :categories_like_general, -> { where(name: "General") }, through: :categorizations, source: :category, class_name: "Category"
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has_many :categorized_posts, through: :categorizations, source: :post
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has_many :unique_categorized_posts, -> { distinct }, through: :categorizations, source: :post
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has_many :nothings, through: :kateggorisatons, class_name: "Category"
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has_many :author_favorites
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has_many :favorite_authors, -> { order("name") }, through: :author_favorites
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has_many :taggings, through: :posts, source: :taggings
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has_many :taggings_2, through: :posts, source: :tagging
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has_many :tags, through: :posts
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has_many :ordered_tags, through: :posts
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has_many :post_categories, through: :posts, source: :categories
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has_many :tagging_tags, through: :taggings, source: :tag
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has_many :similar_posts, -> { distinct }, through: :tags, source: :tagged_posts
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has_many :ordered_posts, -> { distinct }, through: :ordered_tags, source: :tagged_posts
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has_many :distinct_tags, -> { select("DISTINCT tags.*").order("tags.name") }, through: :posts, source: :tags
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has_many :tags_with_primary_key, through: :posts
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has_many :books
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has_many :published_books, class_name: "PublishedBook"
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has_many :unpublished_books, -> { where(status: [:proposed, :written]) }, class_name: "Book"
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has_many :subscriptions, through: :books
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has_many :subscribers, -> { order("subscribers.nick") }, through: :subscriptions
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has_many :distinct_subscribers, -> { select("DISTINCT subscribers.*").order("subscribers.nick") }, through: :subscriptions, source: :subscriber
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has_one :essay, primary_key: :name, as: :writer
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has_one :essay_category, through: :essay, source: :category
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has_one :essay_owner, through: :essay, source: :owner
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has_one :essay_2, primary_key: :name, class_name: "Essay", foreign_key: :author_id
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has_one :essay_category_2, through: :essay_2, source: :category
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has_many :essays, primary_key: :name, as: :writer
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has_many :essay_categories, through: :essays, source: :category
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has_many :essay_owners, through: :essays, source: :owner
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has_many :essays_2, primary_key: :name, class_name: "Essay", foreign_key: :author_id
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has_many :essay_categories_2, through: :essays_2, source: :category
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belongs_to :owned_essay, primary_key: :name, class_name: "Essay"
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has_one :owned_essay_category, through: :owned_essay, source: :category
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belongs_to :author_address, dependent: :destroy
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belongs_to :author_address_extra, dependent: :delete, class_name: "AuthorAddress"
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has_many :category_post_comments, through: :categories, source: :post_comments
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has_many :misc_posts, -> { where(posts: { title: ["misc post by bob", "misc post by mary"] }) }, class_name: "Post"
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has_many :misc_post_first_blue_tags, through: :misc_posts, source: :first_blue_tags
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has_many :misc_post_first_blue_tags_2, -> { where(posts: { title: ["misc post by bob", "misc post by mary"] }) },
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through: :posts, source: :first_blue_tags_2
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has_many :posts_with_default_include, class_name: "PostWithDefaultInclude"
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has_many :comments_on_posts_with_default_include, through: :posts_with_default_include, source: :comments
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has_many :posts_with_signature, ->(record) { where("posts.title LIKE ?", "%by #{record.name.downcase}%") }, class_name: "Post"
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has_many :posts_mentioning_author, ->(record = nil) { where("posts.body LIKE ?", "%#{record&.name&.downcase}%") }, class_name: "Post"
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has_one :recent_post, -> { order(id: :desc) }, class_name: "Post"
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has_one :recent_response, through: :recent_post, source: :comments
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has_many :posts_with_extension, -> { order(:title) }, class_name: "Post" do
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def extension_method; end
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end
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has_many :posts_with_extension_and_instance, ->(record) { order(:title) }, class_name: "Post" do
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def extension_method; end
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end
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has_many :top_posts, -> { order(id: :asc) }, class_name: "Post"
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has_many :other_top_posts, -> { order(id: :asc) }, class_name: "Post"
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attr_accessor :post_log
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after_initialize :set_post_log
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def set_post_log
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@post_log = []
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end
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def label
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"#{id}-#{name}"
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end
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def social
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%w(twitter github)
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end
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validates_presence_of :name
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private
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def throw_abort(_)
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throw(:abort)
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end
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def ensure_not_called(_)
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raise
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end
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def log_before_adding(object)
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@post_log << "before_adding#{object.id || '<new>'}"
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end
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def log_after_adding(object)
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@post_log << "after_adding#{object.id}"
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end
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def log_before_removing(object)
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@post_log << "before_removing#{object.id}"
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end
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def log_after_removing(object)
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@post_log << "after_removing#{object.id}"
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end
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def raise_exception(object)
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raise Exception.new("You can't add a post")
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end
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end
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class AuthorAddress < ActiveRecord::Base
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has_one :author
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def self.destroyed_author_address_ids
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@destroyed_author_address_ids ||= []
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end
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before_destroy do |author_address|
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AuthorAddress.destroyed_author_address_ids << author_address.id
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end
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end
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class AuthorFavorite < ActiveRecord::Base
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belongs_to :author
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belongs_to :favorite_author, class_name: "Author"
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end
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class AuthorFavoriteWithScope < ActiveRecord::Base
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self.table_name = "author_favorites"
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default_scope { order(id: :asc) }
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belongs_to :author
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belongs_to :favorite_author, class_name: "Author"
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end
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