1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
require File.join(File.dirname(__FILE__), '..', '..', '..', '..', '..', 'spec_helper')
module Arel
describe Project do
before do
@relation = Table.new(:users)
@attribute = @relation[:id]
end
describe '#attributes' do
before do
@projection = Project.new(@relation, @attribute)
end
it "manufactures attributes associated with the projection relation" do
@projection.attributes.should == [@attribute].collect { |a| a.bind(@projection) }
end
end
describe '#to_sql' do
describe 'when given an attribute' do
it "manufactures sql with a limited select clause" do
sql = Project.new(@relation, @attribute).to_sql
adapter_is :mysql do
sql.should be_like(%Q{
SELECT `users`.`id`
FROM `users`
})
end
adapter_is_not :mysql do
sql.should be_like(%Q{
SELECT "users"."id"
FROM "users"
})
end
end
end
describe 'when given a relation' do
before do
@scalar_relation = Project.new(@relation, @relation[:name])
end
it "manufactures sql with scalar selects" do
sql = Project.new(@relation, @scalar_relation).to_sql
adapter_is :mysql do
sql.should be_like(%Q{
SELECT (SELECT `users`.`name` FROM `users`) AS `users` FROM `users`
})
end
adapter_is_not :mysql do
sql.should be_like(%Q{
SELECT (SELECT "users"."name" FROM "users") AS "users" FROM "users"
})
end
end
end
describe 'when given a string' do
it "passes the string through to the select clause" do
sql = Project.new(@relation, 'asdf').to_sql
adapter_is :mysql do
sql.should be_like(%Q{
SELECT asdf FROM `users`
})
end
adapter_is_not :mysql do
sql.should be_like(%Q{
SELECT asdf FROM "users"
})
end
end
end
describe 'when given an expression' do
it 'manufactures sql with expressions' do
sql = @relation.project(@attribute.count).to_sql
adapter_is :mysql do
sql.should be_like(%Q{
SELECT COUNT(`users`.`id`) AS count_id
FROM `users`
})
end
adapter_is_not :mysql do
sql.should be_like(%Q{
SELECT COUNT("users"."id") AS count_id
FROM "users"
})
end
end
it 'manufactures sql with distinct expressions' do
sql = @relation.project(@attribute.count(true)).to_sql
adapter_is :mysql do
sql.should be_like(%Q{
SELECT COUNT(DISTINCT `users`.`id`) AS count_id
FROM `users`
})
end
adapter_is_not :mysql do
sql.should be_like(%Q{
SELECT COUNT(DISTINCT "users"."id") AS count_id
FROM "users"
})
end
end
end
end
describe '#externalizable?' do
describe 'when the projections are attributes' do
it 'returns false' do
Project.new(@relation, @attribute).should_not be_externalizable
end
end
describe 'when the projections include an aggregation' do
it "obtains" do
Project.new(@relation, @attribute.sum).should be_externalizable
end
end
end
end
end
|