postgres: Allow for lowercasing quoted fields (#360)

* postgres: Allow for lowercasing quoted fields

This allows for conditionally reverting the behavior changed
418d928 at runtime, while maintaining
the current behavior by default.

* Add ginkgo unit tests for Postgres

dialect_postgres.go

@@ -19,7 +19,8 @@ import (
 )
 
 type PostgresDialect struct {
-	suffix string
+	suffix          string
+	LowercaseFields bool
 }
 
 func (d PostgresDialect) QuerySuffix() string { return ";" }
@@ -128,6 +129,9 @@ func (d PostgresDialect) InsertAutoIncrToTarget(exec SqlExecutor, insertSql stri
 }
 
 func (d PostgresDialect) QuoteField(f string) string {
+	if d.LowercaseFields {
+		return `"` + strings.ToLower(f) + `"`
+	}
 	return `"` + f + `"`
 }
 

dialect_postgres_test.go

@@ -0,0 +1,193 @@
+// Copyright 2012 James Cooper. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+// Package gorp provides a simple way to marshal Go structs to and from
+// SQL databases.  It uses the database/sql package, and should work with any
+// compliant database/sql driver.
+//
+// Source code and project home:
+// https://github.com/go-gorp/gorp
+
+package gorp_test
+
+import (
+	"database/sql"
+	"reflect"
+	"time"
+
+	// ginkgo/gomega functions read better as dot-imports.
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/gomega"
+
+	"github.com/go-gorp/gorp"
+)
+
+var _ = Describe("PostgresDialect", func() {
+	var (
+		lowercasefields bool
+		dialect         gorp.PostgresDialect
+	)
+
+	JustBeforeEach(func() {
+		dialect = gorp.PostgresDialect{
+			LowercaseFields: lowercasefields,
+		}
+	})
+
+	DescribeTable("ToSqlType",
+		func(value interface{}, maxsize int, autoIncr bool, expected string) {
+			typ := reflect.TypeOf(value)
+			sqlType := dialect.ToSqlType(typ, maxsize, autoIncr)
+			Expect(sqlType).To(Equal(expected))
+		},
+		Entry("bool", true, 0, false, "boolean"),
+		Entry("int8", int8(1), 0, false, "integer"),
+		Entry("uint8", uint8(1), 0, false, "integer"),
+		Entry("int16", int16(1), 0, false, "integer"),
+		Entry("uint16", uint16(1), 0, false, "integer"),
+		Entry("int32", int32(1), 0, false, "integer"),
+		Entry("int (treated as int32)", int(1), 0, false, "integer"),
+		Entry("uint32", uint32(1), 0, false, "integer"),
+		Entry("uint (treated as uint32)", uint(1), 0, false, "integer"),
+		Entry("int64", int64(1), 0, false, "bigint"),
+		Entry("uint64", uint64(1), 0, false, "bigint"),
+		Entry("float32", float32(1), 0, false, "real"),
+		Entry("float64", float64(1), 0, false, "double precision"),
+		Entry("[]uint8", []uint8{1}, 0, false, "bytea"),
+		Entry("NullInt64", sql.NullInt64{}, 0, false, "bigint"),
+		Entry("NullFloat64", sql.NullFloat64{}, 0, false, "double precision"),
+		Entry("NullBool", sql.NullBool{}, 0, false, "boolean"),
+		Entry("Time", time.Time{}, 0, false, "timestamp with time zone"),
+		Entry("default-size string", "", 0, false, "text"),
+		Entry("sized string", "", 50, false, "varchar(50)"),
+		Entry("large string", "", 1024, false, "varchar(1024)"),
+	)
+
+	Describe("AutoIncrStr", func() {
+		It("returns the auto increment string", func() {
+			Expect(dialect.AutoIncrStr()).To(Equal(""))
+		})
+	})
+
+	Describe("AutoIncrBindValue", func() {
+		It("returns the value used to bind the auto-increment value", func() {
+			Expect(dialect.AutoIncrBindValue()).To(Equal("default"))
+		})
+	})
+
+	Describe("AutoIncrInsertSuffix", func() {
+		It("returns the suffix needed for auto-incrementing", func() {
+			cm := gorp.ColumnMap{
+				ColumnName: "foo",
+			}
+			Expect(dialect.AutoIncrInsertSuffix(&cm)).To(Equal(` returning "foo"`))
+		})
+	})
+
+	Describe("CreateTableSuffix", func() {
+		It("returns an empty suffix", func() {
+			Expect(dialect.CreateTableSuffix()).To(Equal(""))
+		})
+	})
+
+	Describe("CreateIndexSuffix", func() {
+		It("returns the suffix for creating indexes", func() {
+			Expect(dialect.CreateIndexSuffix()).To(Equal("using"))
+		})
+	})
+
+	Describe("DropIndexSuffix", func() {
+		It("returns the suffix for deleting indexes", func() {
+			Expect(dialect.DropIndexSuffix()).To(Equal(""))
+		})
+	})
+
+	Describe("TruncateClause", func() {
+		It("returns the clause for truncating a table", func() {
+			Expect(dialect.TruncateClause()).To(Equal("truncate"))
+		})
+	})
+
+	Describe("SleepClause", func() {
+		It("returns the clause for sleeping", func() {
+			Expect(dialect.SleepClause(1 * time.Second)).To(Equal("pg_sleep(1.000000)"))
+			Expect(dialect.SleepClause(100 * time.Millisecond)).To(Equal("pg_sleep(0.100000)"))
+		})
+	})
+
+	Describe("BindVar", func() {
+		It("returns the variable binding sequence", func() {
+			Expect(dialect.BindVar(0)).To(Equal("$1"))
+			Expect(dialect.BindVar(4)).To(Equal("$5"))
+		})
+	})
+
+	PDescribe("InsertAutoIncr", func() {})
+
+	Describe("QuoteField", func() {
+		It("returns the argument quoted as a field (mixed case by default)", func() {
+			Expect(dialect.QuoteField("Foo")).To(Equal(`"Foo"`))
+			Expect(dialect.QuoteField("bar")).To(Equal(`"bar"`))
+		})
+		Context("with lowercase fields", func() {
+			BeforeEach(func() {
+				lowercasefields = true
+			})
+			It("returns the argument quoted as a field", func() {
+				Expect(dialect.QuoteField("Foo")).To(Equal(`"foo"`))
+			})
+		})
+	})
+
+	Describe("QuotedTableForQuery", func() {
+		var (
+			schema, table string
+
+			quotedTable string
+		)
+
+		JustBeforeEach(func() {
+			quotedTable = dialect.QuotedTableForQuery(schema, table)
+		})
+
+		Context("using the default schema", func() {
+			BeforeEach(func() {
+				schema = ""
+				table = "foo"
+			})
+			It("returns just the table", func() {
+				Expect(quotedTable).To(Equal(`"foo"`))
+			})
+		})
+
+		Context("with a supplied schema", func() {
+			BeforeEach(func() {
+				schema = "foo"
+				table = "bar"
+			})
+			It("returns the schema and table", func() {
+				Expect(quotedTable).To(Equal(`foo."bar"`))
+			})
+		})
+	})
+
+	Describe("IfSchemaNotExists", func() {
+		It("appends 'if not exists' to the command", func() {
+			Expect(dialect.IfSchemaNotExists("foo", "bar")).To(Equal("foo if not exists"))
+		})
+	})
+
+	Describe("IfTableExists", func() {
+		It("appends 'if exists' to the command", func() {
+			Expect(dialect.IfTableExists("foo", "bar", "baz")).To(Equal("foo if exists"))
+		})
+	})
+
+	Describe("IfTableNotExists", func() {
+		It("appends 'if not exists' to the command", func() {
+			Expect(dialect.IfTableNotExists("foo", "bar", "baz")).To(Equal("foo if not exists"))
+		})
+	})
+})