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# frozen_string_literal: true
require "cases/helper"
require "models/author"
require "models/comment"
require "models/developer"
require "models/computer"
require "models/post"
require "models/project"
require "models/rating"
class RelationMergingTest < ActiveRecord::TestCase
fixtures :developers, :comments, :authors, :author_addresses, :posts
def test_relation_merging
devs = Developer.where("salary >= 80000").merge(Developer.limit(2)).merge(Developer.order("id ASC").where("id < 3"))
assert_equal [developers(:david), developers(:jamis)], devs.to_a
dev_with_count = Developer.limit(1).merge(Developer.order("id DESC")).merge(Developer.select("developers.*"))
assert_equal [developers(:poor_jamis)], dev_with_count.to_a
end
def test_relation_to_sql
post = Post.first
sql = post.comments.to_sql
assert_match(/.?post_id.? = #{post.id}\z/i, sql)
end
def test_relation_merging_with_arel_equalities_keeps_last_equality
devs = Developer.where(Developer.arel_table[:salary].eq(80000)).merge(
Developer.where(Developer.arel_table[:salary].eq(9000))
)
assert_equal [developers(:poor_jamis)], devs.to_a
end
def test_relation_merging_with_arel_equalities_keeps_last_equality_with_non_attribute_left_hand
salary_attr = Developer.arel_table[:salary]
devs = Developer.where(
Arel::Nodes::NamedFunction.new("abs", [salary_attr]).eq(80000)
).merge(
Developer.where(
Arel::Nodes::NamedFunction.new("abs", [salary_attr]).eq(9000)
)
)
assert_equal [developers(:poor_jamis)], devs.to_a
end
def test_relation_merging_with_eager_load
relations = []
relations << Post.order("comments.id DESC").merge(Post.eager_load(:last_comment)).merge(Post.all)
relations << Post.eager_load(:last_comment).merge(Post.order("comments.id DESC")).merge(Post.all)
relations.each do |posts|
post = posts.find { |p| p.id == 1 }
assert_equal Post.find(1).last_comment, post.last_comment
end
end
def test_relation_merging_with_locks
devs = Developer.lock.where("salary >= 80000").order("id DESC").merge(Developer.limit(2))
assert devs.locked?
end
def test_relation_merging_with_preload
[Post.all.merge(Post.preload(:author)), Post.preload(:author).merge(Post.all)].each do |posts|
assert_queries(2) { assert posts.first.author }
end
end
def test_relation_merging_with_joins
comments = Comment.joins(:post).where(body: "Thank you for the welcome").merge(Post.where(body: "Such a lovely day"))
assert_equal 1, comments.count
end
def test_relation_merging_with_left_outer_joins
comments = Comment.joins(:post).where(body: "Thank you for the welcome").merge(Post.left_outer_joins(:author).where(body: "Such a lovely day"))
assert_equal 1, comments.count
end
def test_relation_merging_with_association
assert_queries(2) do # one for loading post, and another one merged query
post = Post.where(body: "Such a lovely day").first
comments = Comment.where(body: "Thank you for the welcome").merge(post.comments)
assert_equal 1, comments.count
end
end
test "merge collapses wheres from the LHS only" do
left = Post.where(title: "omg").where(comments_count: 1)
right = Post.where(title: "wtf").where(title: "bbq")
merged = left.merge(right)
assert_not_includes merged.to_sql, "omg"
assert_includes merged.to_sql, "wtf"
assert_includes merged.to_sql, "bbq"
end
def test_merging_reorders_bind_params
post = Post.first
right = Post.where(id: 1)
left = Post.where(title: post.title)
merged = left.merge(right)
assert_equal post, merged.first
end
def test_merging_compares_symbols_and_strings_as_equal
post = PostThatLoadsCommentsInAnAfterSaveHook.create!(title: "First Post", body: "Blah blah blah.")
assert_equal "First comment!", post.comments.where(body: "First comment!").first_or_create.body
end
def test_merging_with_from_clause
relation = Post.all
assert relation.from_clause.empty?
relation = relation.merge(Post.from("posts"))
refute relation.from_clause.empty?
end
end
class MergingDifferentRelationsTest < ActiveRecord::TestCase
fixtures :posts, :authors, :author_addresses, :developers
test "merging where relations" do
hello_by_bob = Post.where(body: "hello").joins(:author).
merge(Author.where(name: "Bob")).order("posts.id").pluck("posts.id")
assert_equal [posts(:misc_by_bob).id,
posts(:other_by_bob).id], hello_by_bob
end
test "merging order relations" do
posts_by_author_name = Post.limit(3).joins(:author).
merge(Author.order(:name)).pluck("authors.name")
assert_equal ["Bob", "Bob", "David"], posts_by_author_name
posts_by_author_name = Post.limit(3).joins(:author).
merge(Author.order("name")).pluck("authors.name")
assert_equal ["Bob", "Bob", "David"], posts_by_author_name
end
test "merging order relations (using a hash argument)" do
posts_by_author_name = Post.limit(4).joins(:author).
merge(Author.order(name: :desc)).pluck("authors.name")
assert_equal ["Mary", "Mary", "Mary", "David"], posts_by_author_name
end
test "relation merging (using a proc argument)" do
dev = Developer.where(name: "Jamis").first
comment_1 = dev.comments.create!(body: "I'm Jamis", post: Post.first)
rating_1 = comment_1.ratings.create!
comment_2 = dev.comments.create!(body: "I'm John", post: Post.first)
comment_2.ratings.create!
assert_equal dev.ratings, [rating_1]
end
end
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