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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)], [["id", 1]])
second_clause = WhereClause.new([table["name"].eq(bind_param)], [["name", "Sean"]])
combined = WhereClause.new(
[table["id"].eq(bind_param), table["name"].eq(bind_param)],
[["id", 1], ["name", "Sean"]],
)
assert_equal combined, first_clause + second_clause
end
test "+ is associative, but not commutative" do
a = WhereClause.new(["a"], ["bind a"])
b = WhereClause.new(["b"], ["bind b"])
c = WhereClause.new(["c"], ["bind 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)], [["id", 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), table["name"].eq(bind_param)],
[[column("id"), 1], [column("name"), "Sean"]],
)
b = WhereClause.new(
[table["name"].eq(bind_param)],
[[column("name"), "Jim"]]
)
expected = WhereClause.new(
[table["id"].eq(bind_param), table["name"].eq(bind_param)],
[[column("id"), 1], [column("name"), "Jim"]],
)
assert_equal expected, a.merge(b)
end
test "merge allows for columns with the same name from different tables" do
skip "This is not possible as of 4.2, and the binds do not yet contain sufficient information for this to happen"
# We might be able to change the implementation to remove conflicts by index, rather than column name
end
test "a clause knows if it is empty" do
assert WhereClause.empty.empty?
assert_not WhereClause.new(["anything"], []).empty?
end
private
def table
Arel::Table.new("table")
end
def bind_param
Arel::Nodes::BindParam.new
end
def column(name)
ActiveRecord::ConnectionAdapters::Column.new(name, nil, nil)
end
end
end
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