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migrations.js
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migrations.js
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var async = require('async')
, fs = require('fs')
, fspath = require('path')
, pg = require('pg')
var config = require('./config')
, Migration = require('./migration')
var applied_ids = async.memoize(function(next) {
var sql = "SELECT id "
+ "FROM " + config.migrations_table + " "
+ "ORDER BY id "
pg.connect(config.database_url, function(err, client) {
if(err) return next(err)
client.query(sql, function(err, result) {
if(err) return next(err)
next(null, result.rows)
})
})
})
var all = async.memoize(function(next) {
fs.readdir(config.migrations_directory, function(err, filenames) {
if(err) return next(err)
var is_directory = function(filename, next) {
var path = fspath.join(config.migrations_directory, filename)
fs.stat(path, function(err, stats) {
if(err) return next(null) // doesn't accept error arg
next(stats.isDirectory())
})
}
async.filter( filenames ,is_directory
, function(directories) {
var ms = directories.map(function(directory) {
return new Migration(directory)
})
next(null, ms)
}
)
})
})
var filtered = function(condition, next) {
all(function(err, migrations) {
if(err) return next(err)
var sorted_migrations = migrations.sort(function(x, y) {
return x.id > y.id
})
, filtered_migrations = sorted_migrations.filter(condition)
next(null, filtered_migrations)
})
}
var pending = async.memoize(function(next) {
applied_ids(function(err, ids) {
if(err) return next(err)
filtered( function(m) {
return ids.every(function(a) { return a.id != m.id })
}
, next
)
})
})
var applied = async.memoize(function(next) {
applied_ids(function(err, ids) {
if(err) return next(err)
filtered( function(m) {
return ids.some(function(a) { return a.id == m.id })
}
, next
)
})
})
module.exports = { all: all
, pending: pending
, applied: applied
}