我是Rails的新手，我正在尝试通过CSV将用户上传到我的Rails应用，但是我收到了错误消息。密钥'index_users_on_email'的重复条目'xyz@gmail.com'我不确定如何在CSV中验证重复条目请帮忙。
这是我的代码：
def self.import_students(school, file)
params = {
"students_attributes" => {}
}
row_count = 1
users_count = 0
errors = []
CSV.foreach(file.path, headers: true) do |row|
row_count += 1
standard = Standard.where(name: row["Standard"]).first
fields = ['Name', 'Email', 'Gender', 'Standard', 'Section']
fields.each do |field|
if row[field].blank?
errors << {
row: row_count,
message: "can't be empty",
column: field
}
end
end
if standard.blank?
errors << {
row: row_count,
message: "Invalid Standard #{row['Standard']} - Not found",
column: "Standard"
}
end
section = school.sections.where(standard_id: standard.id, name: row["Section"]).first
section_id = section.blank? ? nil : section.id
if section_id.blank?
errors << {
row: row_count,
message: "Invalid Section #{row['Section']} - Not found",
column: "Section"
}
end
user_params = {
name: row["Name"],
email: row["Email"],
role: User::ROLE_STUDENT,
gender: row['Gender'].to_s.downcase == "male",
studies_attributes: {
"0" => {
section_id: section_id,
academic_year_id: school.academic_year.id,
roll_no: row["Roll"].to_i,
}
}
}
params['students_attributes'][users_count] = user_params
users_count += 1
end
return {
params: params,
errors: errors
}
end
我在控制器中的导入操作：
def import
if params[:students_file].present?
output = User.import_students(@school, params[:students_file])
elsif params[:teachers_file].present?
output = User.import_teachers(@school, params[:teachers_file])
end
if output[:errors].blank?
return output[:params]
else
@errors = output[:errors]
respond_to do |format|
@action_name = default_action.to_s
format.html { render action: @action_name }
end
return false
end
end
def update
if (params[:students_file].present?
output = import
if output
build_params = output
else
return
end
else
build_params = school_params
end
respond_to do |format|
if @school.update(build_params)
format.html { default_redirect }
format.json { head :no_content }
else
@action_name = default_action.to_s
format.html { render action: @action_name }
format.json { render json: @school.errors, status: :unprocessable_entity }
end
end
end
答案 0 :(得分：0)
声明一个数组email_count并将email字段存储在email_count中以检查重复的条目。即使我已经添加了for的代码，如果以防电子邮件已经存在于数据库中。
将这段代码添加到您的代码中，在顶部声明 email_count = [] 。
if email_count.include? row["Email"]
errors << {
row: row_count,
message: "Duplicate Entry",
column: "Email"
}
end
email_count << row["Email"]
我已更新您的上述代码
def self.import_students(school, file)
params = {
"students_attributes" => {}
}
email_count = []
row_count = 1
users_count = 0
errors = []
CSV.foreach(file.path, headers: true) do |row|
row_count += 1
standard = Standard.where(name: row["Standard"]).first
fields = ['Name', 'Email', 'Gender', 'Standard', 'Section']
fields.each do |field|
if row[field].blank?
errors << {
row: row_count,
message: "can't be empty",
column: field
}
end
end
if User.where(:email => row["Email"]).exists?
errors << {
row: row_count,
message: "Email already taken",
column: "Email"
}
end
if standard.blank?
errors << {
row: row_count,
message: "Invalid Standard #{row['Standard']} - Not found",
column: "Standard"
}
end
section = school.sections.where(standard_id: standard.id, name: row["Section"]).first
section_id = section.blank? ? nil : section.id
if section_id.blank?
errors << {
row: row_count,
message: "Invalid Section #{row['Section']} - Not found",
column: "Section"
}
end
# debugger
if email_count.include? row["Email"]
errors << {
row: row_count,
message: "Duplicate Entry",
column: "Email"
}
end
email_count << row["Email"]
# debugger
user_params = {
name: row["Name"],
email: row["Email"],
role: User::ROLE_STUDENT,
gender: row['Gender'].to_s.downcase == "male",
studies_attributes: {
"0" => {
section_id: section_id,
academic_year_id: school.academic_year.id,
roll_no: row["Roll"].to_i,
}
}
}
# debugger
params['students_attributes'][users_count] = user_params
# debugger
users_count += 1
end
return {
params: params,
errors: errors
}
end
答案 1 :(得分：-1)
问题不在于您的CSV。听起来问题是你有一个哈希，它试图使用相同的密钥创建两个键值对，在这种情况下是相同的电子邮件地址。您有几个选择：