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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe WhereComposite do
describe '.where_composite' do
let_it_be(:test_table_name) { "test_table_#{SecureRandom.hex(10)}" }
let(:model) do
tbl_name = test_table_name
Class.new(ActiveRecord::Base) do
self.table_name = tbl_name
include WhereComposite
end
end
def connection
ActiveRecord::Base.connection
end
before_all do
connection.create_table(test_table_name) do |t|
t.integer :foo
t.integer :bar
t.string :wibble
end
end
it 'requires at least one permitted key' do
expect { model.where_composite([], nil) }
.to raise_error(ArgumentError)
end
it 'requires all arguments to match the permitted_keys' do
expect { model.where_composite([:foo], [{ foo: 1 }, { bar: 2 }]) }
.to raise_error(ArgumentError)
end
it 'attaches a key error as cause if a key is missing' do
expect { model.where_composite([:foo], [{ foo: 1 }, { bar: 2 }]) }
.to raise_error(have_attributes(cause: KeyError))
end
it 'returns an empty relation if there are no arguments' do
expect(model.where_composite([:foo, :bar], nil))
.to be_empty
expect(model.where_composite([:foo, :bar], []))
.to be_empty
end
it 'permits extra arguments' do
a = model.where_composite([:foo, :bar], { foo: 1, bar: 2 })
b = model.where_composite([:foo, :bar], { foo: 1, bar: 2, baz: 3 })
expect(a.to_sql).to eq(b.to_sql)
end
it 'can handle multiple fields' do
fields = [:foo, :bar, :wibble]
args = { foo: 1, bar: 2, wibble: 'wobble' }
pattern = %r{
WHERE \s+
\(?
\s* "#{test_table_name}"\."foo" \s* = \s* 1
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 2
\s+ AND
\s+ "#{test_table_name}"\."wibble" \s* = \s* 'wobble'
\s*
\)?
}x
expect(model.where_composite(fields, args).to_sql).to match(pattern)
end
it 'is equivalent to ids.map { |attrs| model.find_by(attrs) }' do
10.times do |i|
10.times do |j|
model.create!(foo: i, bar: j, wibble: generate(:filename))
end
end
ids = [{ foo: 1, bar: 9 }, { foo: 9, bar: 1 }]
found = model.where_composite(%i[foo bar], ids)
expect(found).to match_array(ids.map { |attrs| model.find_by!(attrs) })
end
it 'constructs (A&B) for one argument' do
fields = [:foo, :bar]
args = [
{ foo: 1, bar: 2 }
]
pattern = %r{
WHERE \s+
\(?
\s* "#{test_table_name}"\."foo" \s* = \s* 1
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 2
\s*
\)?
}x
expect(model.where_composite(fields, args).to_sql).to match(pattern)
expect(model.where_composite(fields, args[0]).to_sql).to match(pattern)
end
it 'constructs (A&B) OR (C&D) for two arguments' do
args = [
{ foo: 1, bar: 2 },
{ foo: 3, bar: 4 }
]
pattern = %r{
WHERE \s+
\( \s* "#{test_table_name}"\."foo" \s* = \s* 1
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 2
\s* \)?
\s* OR \s*
\(? \s* "#{test_table_name}"\."foo" \s* = \s* 3
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 4
\s* \)
}x
q = model.where_composite([:foo, :bar], args)
expect(q.to_sql).to match(pattern)
end
it 'constructs (A&B) OR (C&D) OR (E&F) for three arguments' do
args = [
{ foo: 1, bar: 2 },
{ foo: 3, bar: 4 },
{ foo: 5, bar: 6 }
]
pattern = %r{
WHERE \s+
\({2}
\s* "#{test_table_name}"\."foo" \s* = \s* 1
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 2
\s* \)?
\s* OR \s*
\(? \s* "#{test_table_name}"\."foo" \s* = \s* 3
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 4
\s* \)?
\s* OR \s*
\(? \s* "#{test_table_name}"\."foo" \s* = \s* 5
\s+ AND
\s+ "#{test_table_name}"\."bar" \s* = \s* 6
\s* \)
}x
q = model.where_composite([:foo, :bar], args)
expect(q.to_sql).to match(pattern)
end
describe 'large sets of IDs' do
def query(size)
args = (0..).lazy.take(size).map { |n| { foo: n, bar: n * n, wibble: 'x' * n } }.to_a
model.where_composite([:foo, :bar, :wibble], args)
end
it 'constructs correct trees of constraints' do
n = described_class::TooManyIds::LIMIT
q = query(n)
sql = q.to_sql
expect(sql.scan(/OR/).count).to eq(n - 1)
expect(sql.scan(/AND/).count).to eq(2 * n)
end
it 'raises errors if too many IDs are passed' do
expect { query(described_class::TooManyIds::LIMIT + 1) }.to raise_error(described_class::TooManyIds)
end
end
end
end
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