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# frozen_string_literal: true
require "cases/helper"
class ActiveRecord::Relation
class WhereClauseTest < ActiveRecord::TestCase
test "+ combines two where clauses" do
first_clause = WhereClause.new([table["id"].eq(bind_param(1))])
second_clause = WhereClause.new([table["name"].eq(bind_param("Sean"))])
combined = WhereClause.new(
[table["id"].eq(bind_param(1)), table["name"].eq(bind_param("Sean"))],
)
assert_equal combined, first_clause + second_clause
end
test "+ is associative, but not commutative" do
a = WhereClause.new(["a"])
b = WhereClause.new(["b"])
c = WhereClause.new(["c"])
assert_equal a + (b + c), (a + b) + c
assert_not_equal a + b, b + a
end
test "an empty where clause is the identity value for +" do
clause = WhereClause.new([table["id"].eq(bind_param(1))])
assert_equal clause, clause + WhereClause.empty
end
test "merge combines two where clauses" do
a = WhereClause.new([table["id"].eq(1)])
b = WhereClause.new([table["name"].eq("Sean")])
expected = WhereClause.new([table["id"].eq(1), table["name"].eq("Sean")])
assert_equal expected, a.merge(b)
end
test "merge keeps the right side, when two equality clauses reference the same column" do
a = WhereClause.new([table["id"].eq(1), table["name"].eq("Sean")])
b = WhereClause.new([table["name"].eq("Jim")])
expected = WhereClause.new([table["id"].eq(1), table["name"].eq("Jim")])
assert_equal expected, a.merge(b)
end
test "merge removes bind parameters matching overlapping equality clauses" do
a = WhereClause.new(
[table["id"].eq(bind_param(1)), table["name"].eq(bind_param("Sean"))],
)
b = WhereClause.new(
[table["name"].eq(bind_param("Jim"))],
)
expected = WhereClause.new(
[table["id"].eq(bind_param(1)), table["name"].eq(bind_param("Jim"))],
)
assert_equal expected, a.merge(b)
end
test "merge allows for columns with the same name from different tables" do
table2 = Arel::Table.new("table2")
a = WhereClause.new(
[table["id"].eq(bind_param(1)), table2["id"].eq(bind_param(2))],
)
b = WhereClause.new(
[table["id"].eq(bind_param(3))],
)
expected = WhereClause.new(
[table2["id"].eq(bind_param(2)), table["id"].eq(bind_param(3))],
)
assert_equal expected, a.merge(b)
end
test "a clause knows if it is empty" do
assert WhereClause.empty.empty?
assert_not WhereClause.new(["anything"]).empty?
end
test "invert cannot handle nil" do
where_clause = WhereClause.new([nil])
assert_raises ArgumentError do
where_clause.invert
end
end
test "invert replaces each part of the predicate with its inverse" do
random_object = Object.new
original = WhereClause.new([
table["id"].in([1, 2, 3]),
table["id"].eq(1),
"sql literal",
random_object
])
expected = WhereClause.new([
table["id"].not_in([1, 2, 3]),
table["id"].not_eq(1),
Arel::Nodes::Not.new(Arel::Nodes::SqlLiteral.new("sql literal")),
Arel::Nodes::Not.new(random_object)
])
assert_equal expected, original.invert
end
test "except removes binary predicates referencing a given column" do
where_clause = WhereClause.new([
table["id"].in([1, 2, 3]),
table["name"].eq(bind_param("Sean")),
table["age"].gteq(bind_param(30)),
])
expected = WhereClause.new([table["age"].gteq(bind_param(30))])
assert_equal expected, where_clause.except("id", "name")
end
test "except jumps over unhandled binds (like with OR) correctly" do
wcs = (0..9).map do |i|
WhereClause.new([table["id#{i}"].eq(bind_param(i))])
end
wc = wcs[0] + wcs[1] + wcs[2].or(wcs[3]) + wcs[4] + wcs[5] + wcs[6].or(wcs[7]) + wcs[8] + wcs[9]
expected = wcs[0] + wcs[2].or(wcs[3]) + wcs[5] + wcs[6].or(wcs[7]) + wcs[9]
actual = wc.except("id1", "id2", "id4", "id7", "id8")
assert_equal expected, actual
end
test "ast groups its predicates with AND" do
predicates = [
table["id"].in([1, 2, 3]),
table["name"].eq(bind_param(nil)),
]
where_clause = WhereClause.new(predicates)
expected = Arel::Nodes::And.new(predicates)
assert_equal expected, where_clause.ast
end
test "ast wraps any SQL literals in parenthesis" do
random_object = Object.new
where_clause = WhereClause.new([
table["id"].in([1, 2, 3]),
"foo = bar",
random_object,
])
expected = Arel::Nodes::And.new([
table["id"].in([1, 2, 3]),
Arel::Nodes::Grouping.new(Arel.sql("foo = bar")),
random_object,
])
assert_equal expected, where_clause.ast
end
test "ast removes any empty strings" do
where_clause = WhereClause.new([table["id"].in([1, 2, 3])])
where_clause_with_empty = WhereClause.new([table["id"].in([1, 2, 3]), ""])
assert_equal where_clause.ast, where_clause_with_empty.ast
end
test "or joins the two clauses using OR" do
where_clause = WhereClause.new([table["id"].eq(bind_param(1))])
other_clause = WhereClause.new([table["name"].eq(bind_param("Sean"))])
expected_ast =
Arel::Nodes::Grouping.new(
Arel::Nodes::Or.new(table["id"].eq(bind_param(1)), table["name"].eq(bind_param("Sean")))
)
assert_equal expected_ast.to_sql, where_clause.or(other_clause).ast.to_sql
end
test "or returns an empty where clause when either side is empty" do
where_clause = WhereClause.new([table["id"].eq(bind_param(1))])
assert_equal WhereClause.empty, where_clause.or(WhereClause.empty)
assert_equal WhereClause.empty, WhereClause.empty.or(where_clause)
end
test "or places common conditions before the OR" do
a = WhereClause.new(
[table["id"].eq(bind_param(1)), table["name"].eq(bind_param("Sean"))],
)
b = WhereClause.new(
[table["id"].eq(bind_param(1)), table["hair_color"].eq(bind_param("black"))],
)
common = WhereClause.new(
[table["id"].eq(bind_param(1))],
)
or_clause = WhereClause.new([table["name"].eq(bind_param("Sean"))])
.or(WhereClause.new([table["hair_color"].eq(bind_param("black"))]))
assert_equal common + or_clause, a.or(b)
end
test "or can detect identical or as being a common condition" do
common_or = WhereClause.new([table["name"].eq(bind_param("Sean"))])
.or(WhereClause.new([table["hair_color"].eq(bind_param("black"))]))
a = common_or + WhereClause.new([table["id"].eq(bind_param(1))])
b = common_or + WhereClause.new([table["foo"].eq(bind_param("bar"))])
new_or = WhereClause.new([table["id"].eq(bind_param(1))])
.or(WhereClause.new([table["foo"].eq(bind_param("bar"))]))
assert_equal common_or + new_or, a.or(b)
end
test "or will use only common conditions if one side only has common conditions" do
only_common = WhereClause.new([
table["id"].eq(bind_param(1)),
"foo = bar",
])
common_with_extra = WhereClause.new([
table["id"].eq(bind_param(1)),
"foo = bar",
table["extra"].eq(bind_param("pluto")),
])
assert_equal only_common, only_common.or(common_with_extra)
assert_equal only_common, common_with_extra.or(only_common)
end
private
def table
Arel::Table.new("table")
end
def bind_param(value)
Arel::Nodes::BindParam.new(value)
end
end
end
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