rake - Ruby on Rails: Migrations: how do I merge to tables into a new table? -

rake - Ruby on Rails: Migrations: how do I merge to tables into a new table? -

August 15, 2010

मेरे पास दो टेबल संलग्न हैं:

  नाम, doc_name, doc_type, doc_size, cat < / Code>

  और मीडिया: 
   नाम, doc_name, doc_type, doc_size, बिल्ली  
  मैं एक माइग्रेशन फ़ाइल कैसे लिखूं जैसे कि यह दोनों तालिकाओं से सभी प्रविष्टियां लेता है और उन्हें एक नया  फ़ाइलें  तालिका में डालता है?

  
 <पूर्व>  वर्ग मर्ज अटैचमेंट मीडिया टूफाइल & lt; ActiveRecord :: माइग्रेशन डीएफ़ self.up create_table: files do | t | T.column: नाम,: स्ट्रिंग # ... अंत अटैचमेंट.फिंड (: सभी) .each do | attachment | फ़ाइल। बनाएं (: नाम = & attach; attachment.name,: doc_name = & gt; attachment.doc_name,: doc_type = & gt; attachment.doc_type,: doc_size = & gt; attachment.doc_size,: बिल्ली = & gt; attachment.cat) अंत # मीडिया एंड एंड   
  के लिए समान हैं


















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