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)], [bind_attribute("id", 1), bind_attribute("name", "Sean")], ) b = WhereClause.new( [table["name"].eq(bind_param)], [bind_attribute("name", "Jim")] ) expected = WhereClause.new( [table["id"].eq(bind_param), table["name"].eq(bind_param)], [bind_attribute("id", 1), bind_attribute("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 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 "accept removes binary predicates referencing a given column" do where_clause = WhereClause.new([ table["id"].in([1, 2, 3]), table["name"].eq(bind_param), table["age"].gteq(bind_param), ], [ bind_attribute("name", "Sean"), bind_attribute("age", 30), ]) expected = WhereClause.new([table["age"].gteq(bind_param)], [bind_attribute("age", 30)]) assert_equal expected, where_clause.except("id", "name") end test "ast groups its predicates with AND" do predicates = [ table["id"].in([1, 2, 3]), table["name"].eq(bind_param), ] 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")), Arel::Nodes::Grouping.new(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)], [bind_attribute("id", 1)]) other_clause = WhereClause.new([table["name"].eq(bind_param)], [bind_attribute("name", "Sean")]) expected_ast = Arel::Nodes::Grouping.new( Arel::Nodes::Or.new(table["id"].eq(bind_param), table["name"].eq(bind_param)) ) expected_binds = where_clause.binds + other_clause.binds assert_equal expected_ast.to_sql, where_clause.or(other_clause).ast.to_sql assert_equal expected_binds, where_clause.or(other_clause).binds end test "or returns an empty where clause when either side is empty" do where_clause = WhereClause.new([table["id"].eq(bind_param)], [bind_attribute("id", 1)]) assert_equal WhereClause.empty, where_clause.or(WhereClause.empty) assert_equal WhereClause.empty, WhereClause.empty.or(where_clause) end private def table Arel::Table.new("table") end end end