Pycord框架下Discord机器人斜杠命令获取图片生成Prompt问题

用户使用Pycord开发Discord机器人时，编写了generate斜杠命令用于生成图片，但无法正确获取用户输入的imageprompt参数内容，尝试message.content、message.summary等方法均无效。已有实现好的generate_image函数，需解决如何在斜杠命令中获取prompt并调用生成图片的问题，原代码如下：

@bot.slash_command(name = 'generate', description='Generate any image')
async def generate(message, imageprompt: Option(str, description="The prompt to generate", required = True)):
    await message.channel.trigger_typing() #shows that the bot is typing 
    prompt = message.summary(imageprompt)
    image_url = await generate_image(prompt)
    try:
        await message.respond(image_url) #responds to the slash command (bot must respond within 3 seconds)
    except:
        await message.send(image_url) #sends as a regular message, if it cannot send as a slash command 

解决方案 #

在Pycord的斜杠命令函数中，你定义的参数会直接接收用户输入的内容，不需要通过message对象提取。直接使用函数形参imageprompt即可获取用户输入的prompt文本，修改第4行后，完整代码如下：

@bot.slash_command(name = 'generate', description='Generate any image')
async def generate(message, imageprompt: Option(str, description="The prompt to generate", required = True)):
    await message.channel.trigger_typing() #shows that the bot is typing 
    prompt = imageprompt  # 直接使用函数参数获取用户输入的prompt
    image_url = await generate_image(prompt)
    try:
        await message.respond(image_url) #responds to the slash command (bot must respond within 3 seconds)
    except:
        await message.send(image_url) #sends as a regular message, if it cannot send as a slash command 

也可以省去中间变量，直接将imageprompt传入生成函数：

@bot.slash_command(name = 'generate', description='Generate any image')
async def generate(message, imageprompt: Option(str, description="The prompt to generate", required = True)):
    await message.channel.trigger_typing() #shows that the bot is typing 
    image_url = await generate_image(imageprompt)
    try:
        await message.respond(image_url) #responds to the slash command (bot must respond within 3 seconds)
    except:
        await message.send(image_url) #sends as a regular message, if it cannot send as a slash command 

原因是Pycord处理斜杠命令时，会自动将用户输入的参数值传递给函数对应的形参，无需从message对象中额外提取参数内容。

内容的提问来源于stack exchange，提问作者ThatMysticalDude