require 'cases/helper'
require 'models/author'
require 'models/comment'
require 'models/developer'
require 'models/post'
require 'models/project'
class RelationMergingTest < ActiveRecord::TestCase
fixtures :developers, :comments, :authors, :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
sql = Post.connection.unprepared_statement do
Post.first.comments.to_sql
end
assert_no_match(/\?/, 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.present?
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_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")
expected = [left.where_values[1]] + right.where_values
merged = left.merge(right)
assert_equal expected, merged.where_values
assert !merged.to_sql.include?("omg")
assert merged.to_sql.include?("wtf")
assert merged.to_sql.include?("bbq")
end
def test_merging_removes_rhs_bind_parameters
left = Post.where(id: Arel::Nodes::BindParam.new('?'))
column = Post.columns_hash['id']
left.bind_values += [[column, 20]]
right = Post.where(id: 10)
merged = left.merge(right)
assert_equal [], merged.bind_values
end
def test_merging_keeps_lhs_bind_parameters
column = Post.columns_hash['id']
binds = [[column, 20]]
right = Post.where(id: Arel::Nodes::BindParam.new('?'))
right.bind_values += binds
left = Post.where(id: 10)
merged = left.merge(right)
assert_equal binds, merged.bind_values
end
def test_merging_reorders_bind_params
post = Post.first
id_column = Post.columns_hash['id']
title_column = Post.columns_hash['title']
bv = Post.connection.substitute_at id_column, 0
right = Post.where(id: bv)
right.bind_values += [[id_column, post.id]]
left = Post.where(title: bv)
left.bind_values += [[title_column, post.title]]
merged = left.merge(right)
assert_equal post, merged.first
end
end
class MergingDifferentRelationsTest < ActiveRecord::TestCase
fixtures :posts, :authors
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
end
